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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width"> <meta name="nodejs.org:node-version" content="v22.22.0"> <title>Single executable applications | Node.js v22.22.0 Documentation</title> <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Lato:400,700,400italic&display=fallback"> <link rel="stylesheet" href="assets/style.css"> <link rel="stylesheet" href="assets/hljs.css"> <link rel="canonical" href="https://nodejs.org/api/single-executable-applications.html"> <script async defer src="assets/api.js" type="text/javascript"></script> <script> const storedTheme = localStorage.getItem('theme'); // Follow operating system theme preference if (storedTheme === null && window.matchMedia) { const mq = window.matchMedia('(prefers-color-scheme: dark)'); if (mq.matches) { document.documentElement.classList.add('dark-mode'); } } else if (storedTheme === 'dark') { document.documentElement.classList.add('dark-mode'); } 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<li><a href="#v8-code-cache-support">V8 code cache support</a></li> <li><a href="#execution-arguments">Execution arguments</a></li> <li><a href="#execution-argument-extension">Execution argument extension</a></li> </ul> </li> <li><a href="#in-the-injected-main-script">In the injected main script</a> <ul> <li><a href="#single-executable-application-api">Single-executable application API</a> <ul> <li><a href="#seaissea"><code>sea.isSea()</code></a></li> </ul> </li> <li><a href="#seagetassetkey-encoding"><code>sea.getAsset(key[, encoding])</code></a></li> <li><a href="#seagetassetasblobkey-options"><code>sea.getAssetAsBlob(key[, options])</code></a></li> <li><a href="#seagetrawassetkey"><code>sea.getRawAsset(key)</code></a></li> <li><a href="#seagetassetkeys"><code>sea.getAssetKeys()</code></a></li> <li><a href="#requireid-in-the-injected-main-script-is-not-file-based"><code>require(id)</code> in the injected main script is not file based</a></li> <li><a href="#__filename-and-modulefilename-in-the-injected-main-script"><code>__filename</code> and <code>module.filename</code> in the injected main script</a></li> <li><a href="#__dirname-in-the-injected-main-script"><code>__dirname</code> in the injected main script</a></li> </ul> </li> <li><a href="#notes">Notes</a> <ul> <li><a href="#single-executable-application-creation-process">Single executable application creation process</a></li> <li><a href="#platform-support">Platform support</a></li> </ul> </li> </ul> </li> </ul></div></div> </li> <li class="picker-header"> <a href="#gtoc-picker" aria-controls="gtoc-picker"> <span class="picker-arrow"></span> Index </a> <div class="picker" tabindex="-1" id="gtoc-picker"><ul> <li><a href="documentation.html" class="nav-documentation">About this documentation</a></li> <li><a href="synopsis.html" class="nav-synopsis">Usage and example</a></li> <li> <a href="index.html">Index</a> </li> </ul> <hr class="line"> <ul> <li><a href="assert.html" 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href="https://nodejs.org/docs/latest-v22.x/api/single-executable-applications.html">22.x <b>LTS</b></a></li> <li><a href="https://nodejs.org/docs/latest-v21.x/api/single-executable-applications.html">21.x</a></li> <li><a href="https://nodejs.org/docs/latest-v20.x/api/single-executable-applications.html">20.x <b>LTS</b></a></li> <li><a href="https://nodejs.org/docs/latest-v19.x/api/single-executable-applications.html">19.x</a></li></ol></div> </li> <li class="picker-header"> <a href="#options-picker" aria-controls="options-picker"> <span class="picker-arrow"></span> Options </a> <div class="picker" tabindex="-1"> <ul id="options-picker"> <li> <a href="all.html">View on single page</a> </li> <li> <a href="single-executable-applications.json">View as JSON</a> </li> <li class="edit_on_github"><a href="https://github.com/nodejs/node/edit/main/doc/api/single-executable-applications.md">Edit on GitHub</a></li> </ul> </div> </li> </ul> </div> <hr> </header> <details role="navigation" id="toc" open><summary>Table of contents</summary><ul> <li><span class="stability_1.1"><a href="#single-executable-applications">Single executable applications</a></span> <ul> <li><a href="#generating-single-executable-preparation-blobs">Generating single executable preparation blobs</a> <ul> <li><a href="#assets">Assets</a></li> <li><a href="#startup-snapshot-support">Startup snapshot support</a></li> <li><a href="#v8-code-cache-support">V8 code cache support</a></li> <li><a href="#execution-arguments">Execution arguments</a></li> <li><a href="#execution-argument-extension">Execution argument extension</a></li> </ul> </li> <li><a href="#in-the-injected-main-script">In the injected main script</a> <ul> <li><a href="#single-executable-application-api">Single-executable application API</a> <ul> <li><a href="#seaissea"><code>sea.isSea()</code></a></li> </ul> </li> <li><a href="#seagetassetkey-encoding"><code>sea.getAsset(key[, encoding])</code></a></li> <li><a href="#seagetassetasblobkey-options"><code>sea.getAssetAsBlob(key[, options])</code></a></li> <li><a href="#seagetrawassetkey"><code>sea.getRawAsset(key)</code></a></li> <li><a href="#seagetassetkeys"><code>sea.getAssetKeys()</code></a></li> <li><a href="#requireid-in-the-injected-main-script-is-not-file-based"><code>require(id)</code> in the injected main script is not file based</a></li> <li><a href="#__filename-and-modulefilename-in-the-injected-main-script"><code>__filename</code> and <code>module.filename</code> in the injected main script</a></li> <li><a href="#__dirname-in-the-injected-main-script"><code>__dirname</code> in the injected main script</a></li> </ul> </li> <li><a href="#notes">Notes</a> <ul> <li><a href="#single-executable-application-creation-process">Single executable application creation process</a></li> <li><a href="#platform-support">Platform support</a></li> </ul> </li> </ul> </li> </ul></details> <div role="main" id="apicontent"> <h2>Single executable applications<span><a class="mark" href="#single-executable-applications" id="single-executable-applications">#</a></span><a aria-hidden="true" class="legacy" id="single_executable_applications_single_executable_applications"></a></h2> <div class="api_metadata"> <details class="changelog"><summary>History</summary> <table> <tbody><tr><th>Version</th><th>Changes</th></tr> <tr><td>v20.6.0</td> <td><p>Added support for "useSnapshot".</p></td></tr> <tr><td>v20.6.0</td> <td><p>Added support for "useCodeCache".</p></td></tr> <tr><td>v19.7.0, v18.16.0</td> <td><p><span>Added in: v19.7.0, v18.16.0</span></p></td></tr> </tbody></table> </details> </div> <p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1.1</a> - Active development</div><p></p> <p><strong>Source Code:</strong> <a href="https://github.com/nodejs/node/blob/v22.22.0/src/node_sea.cc">src/node_sea.cc</a></p> <p>This feature allows the distribution of a Node.js application conveniently to a system that does not have Node.js installed.</p> <p>Node.js supports the creation of <a href="https://github.com/nodejs/single-executable">single executable applications</a> by allowing the injection of a blob prepared by Node.js, which can contain a bundled script, into the <code>node</code> binary. During start up, the program checks if anything has been injected. If the blob is found, it executes the script in the blob. Otherwise Node.js operates as it normally does.</p> <p>The single executable application feature currently only supports running a single embedded script using the <a href="modules.html#modules-commonjs-modules">CommonJS</a> module system.</p> <p>Users can create a single executable application from their bundled script with the <code>node</code> binary itself and any tool which can inject resources into the binary.</p> <p>Here are the steps for creating a single executable application using one such tool, <a href="https://github.com/nodejs/postject">postject</a>:</p> <ol> <li> <p>Create a JavaScript file:</p> <pre><code class="language-bash"><span class="hljs-built_in">echo</span> <span class="hljs-string">'console.log(`Hello, ${process.argv[2]}!`);'</span> > hello.js</code> <button class="copy-button">copy</button></pre> </li> <li> <p>Create a configuration file building a blob that can be injected into the single executable application (see <a href="#generating-single-executable-preparation-blobs">Generating single executable preparation blobs</a> for details):</p> <pre><code class="language-bash"><span class="hljs-built_in">echo</span> <span class="hljs-string">'{ "main": "hello.js", "output": "sea-prep.blob" }'</span> > sea-config.json</code> <button class="copy-button">copy</button></pre> </li> <li> <p>Generate the blob to be injected:</p> <pre><code class="language-bash">node --experimental-sea-config sea-config.json</code> <button class="copy-button">copy</button></pre> </li> <li> <p>Create a copy of the <code>node</code> executable and name it according to your needs:</p> <ul> <li>On systems other than Windows:</li> </ul> <pre><code class="language-bash"><span class="hljs-built_in">cp</span> $(<span class="hljs-built_in">command</span> -v node) hello</code> <button class="copy-button">copy</button></pre> <ul> <li>On Windows:</li> </ul> <pre><code class="language-text">node -e "require('fs').copyFileSync(process.execPath, 'hello.exe')"</code> <button class="copy-button">copy</button></pre> <p>The <code>.exe</code> extension is necessary.</p> </li> <li> <p>Remove the signature of the binary (macOS and Windows only):</p> <ul> <li>On macOS:</li> </ul> <pre><code class="language-bash">codesign --remove-signature hello</code> <button class="copy-button">copy</button></pre> <ul> <li>On Windows (optional):</li> </ul> <p><a href="https://learn.microsoft.com/en-us/windows/win32/seccrypto/signtool">signtool</a> can be used from the installed <a href="https://developer.microsoft.com/en-us/windows/downloads/windows-sdk/">Windows SDK</a>. If this step is skipped, ignore any signature-related warning from postject.</p> <pre><code class="language-powershell">signtool remove /s hello.exe</code> <button class="copy-button">copy</button></pre> </li> <li> <p>Inject the blob into the copied binary by running <code>postject</code> with the following options:</p> <ul> <li><code>hello</code> / <code>hello.exe</code> - The name of the copy of the <code>node</code> executable created in step 4.</li> <li><code>NODE_SEA_BLOB</code> - The name of the resource / note / section in the binary where the contents of the blob will be stored.</li> <li><code>sea-prep.blob</code> - The name of the blob created in step 1.</li> <li><code>--sentinel-fuse NODE_SEA_FUSE_fce680ab2cc467b6e072b8b5df1996b2</code> - The <a href="https://www.electronjs.org/docs/latest/tutorial/fuses">fuse</a> used by the Node.js project to detect if a file has been injected.</li> <li><code>--macho-segment-name NODE_SEA</code> (only needed on macOS) - The name of the segment in the binary where the contents of the blob will be stored.</li> </ul> <p>To summarize, here is the required command for each platform:</p> <ul> <li> <p>On Linux:</p> <pre><code class="language-bash">npx postject hello NODE_SEA_BLOB sea-prep.blob \ --sentinel-fuse NODE_SEA_FUSE_fce680ab2cc467b6e072b8b5df1996b2</code> <button class="copy-button">copy</button></pre> </li> <li> <p>On Windows - PowerShell:</p> <pre><code class="language-powershell">npx postject hello.exe NODE_SEA_BLOB sea<span class="hljs-literal">-prep</span>.blob ` <span class="hljs-literal">--sentinel-fuse</span> NODE_SEA_FUSE_fce680ab2cc467b6e072b8b5df1996b2</code> <button class="copy-button">copy</button></pre> </li> <li> <p>On Windows - Command Prompt:</p> <pre><code class="language-text">npx postject hello.exe NODE_SEA_BLOB sea-prep.blob ^ --sentinel-fuse NODE_SEA_FUSE_fce680ab2cc467b6e072b8b5df1996b2</code> <button class="copy-button">copy</button></pre> </li> <li> <p>On macOS:</p> <pre><code class="language-bash">npx postject hello NODE_SEA_BLOB sea-prep.blob \ --sentinel-fuse NODE_SEA_FUSE_fce680ab2cc467b6e072b8b5df1996b2 \ --macho-segment-name NODE_SEA</code> <button class="copy-button">copy</button></pre> </li> </ul> </li> <li> <p>Sign the binary (macOS and Windows only):</p> <ul> <li>On macOS:</li> </ul> <pre><code class="language-bash">codesign --sign - hello</code> <button class="copy-button">copy</button></pre> <ul> <li>On Windows (optional):</li> </ul> <p>A certificate needs to be present for this to work. However, the unsigned binary would still be runnable.</p> <pre><code class="language-powershell">signtool sign /fd SHA256 hello.exe</code> <button class="copy-button">copy</button></pre> </li> <li> <p>Run the binary:</p> <ul> <li>On systems other than Windows</li> </ul> <pre><code class="language-console"><span class="hljs-meta prompt_">$ </span><span class="language-bash">./hello world</span> Hello, world!</code> <button class="copy-button">copy</button></pre> <ul> <li>On Windows</li> </ul> <pre><code class="language-console"><span class="hljs-meta prompt_">$ </span><span class="language-bash">.\hello.exe world</span> Hello, world!</code> <button class="copy-button">copy</button></pre> </li> </ol> <section><h3>Generating single executable preparation blobs<span><a class="mark" href="#generating-single-executable-preparation-blobs" id="generating-single-executable-preparation-blobs">#</a></span><a aria-hidden="true" class="legacy" id="single_executable_applications_generating_single_executable_preparation_blobs"></a></h3> <p>Single executable preparation blobs that are injected into the application can be generated using the <code>--experimental-sea-config</code> flag of the Node.js binary that will be used to build the single executable. It takes a path to a configuration file in JSON format. If the path passed to it isn't absolute, Node.js will use the path relative to the current working directory.</p> <p>The configuration currently reads the following top-level fields:</p> <pre><code class="language-json"><span class="hljs-punctuation">{</span> <span class="hljs-attr">"main"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/path/to/bundled/script.js"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"output"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/path/to/write/the/generated/blob.blob"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"disableExperimentalSEAWarning"</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">true</span></span><span class="hljs-punctuation">,</span> <span class="hljs-comment">// Default: false</span> <span class="hljs-attr">"useSnapshot"</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">false</span></span><span class="hljs-punctuation">,</span> <span class="hljs-comment">// Default: false</span> <span class="hljs-attr">"useCodeCache"</span><span class="hljs-punctuation">:</span> <span class="hljs-literal"><span class="hljs-keyword">true</span></span><span class="hljs-punctuation">,</span> <span class="hljs-comment">// Default: false</span> <span class="hljs-attr">"execArgv"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">[</span><span class="hljs-string">"--no-warnings"</span><span class="hljs-punctuation">,</span> <span class="hljs-string">"--max-old-space-size=4096"</span><span class="hljs-punctuation">]</span><span class="hljs-punctuation">,</span> <span class="hljs-comment">// Optional</span> <span class="hljs-attr">"execArgvExtension"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"env"</span><span class="hljs-punctuation">,</span> <span class="hljs-comment">// Default: "env", options: "none", "env", "cli"</span> <span class="hljs-attr">"assets"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-comment">// Optional</span> <span class="hljs-attr">"a.dat"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/path/to/a.dat"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"b.txt"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/path/to/b.txt"</span> <span class="hljs-punctuation">}</span> <span class="hljs-punctuation">}</span></code> <button class="copy-button">copy</button></pre> <p>If the paths are not absolute, Node.js will use the path relative to the current working directory. The version of the Node.js binary used to produce the blob must be the same as the one to which the blob will be injected.</p> <p>Note: When generating cross-platform SEAs (e.g., generating a SEA for <code>linux-x64</code> on <code>darwin-arm64</code>), <code>useCodeCache</code> and <code>useSnapshot</code> must be set to false to avoid generating incompatible executables. Since code cache and snapshots can only be loaded on the same platform where they are compiled, the generated executable might crash on startup when trying to load code cache or snapshots built on a different platform.</p> <div> <h4>Assets<span><a class="mark" href="#assets" id="assets">#</a></span><a aria-hidden="true" class="legacy" id="single_executable_applications_assets"></a></h4> <p>Users can include assets by adding a key-path dictionary to the configuration as the <code>assets</code> field. At build time, Node.js would read the assets from the specified paths and bundle them into the preparation blob. In the generated executable, users can retrieve the assets using the <a href="#seagetassetkey-encoding"><code>sea.getAsset()</code></a> and <a href="#seagetassetasblobkey-options"><code>sea.getAssetAsBlob()</code></a> APIs.</p> <pre><code class="language-json"><span class="hljs-punctuation">{</span> <span class="hljs-attr">"main"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/path/to/bundled/script.js"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"output"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/path/to/write/the/generated/blob.blob"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"assets"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"a.jpg"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/path/to/a.jpg"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"b.txt"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/path/to/b.txt"</span> <span class="hljs-punctuation">}</span> <span class="hljs-punctuation">}</span></code> <button class="copy-button">copy</button></pre> <p>The single-executable application can access the assets as follows:</p> <pre><code class="language-js cjs"><span class="hljs-keyword">const</span> { getAsset, getAssetAsBlob, getRawAsset, getAssetKeys } = <span class="hljs-built_in">require</span>(<span class="hljs-string">'node:sea'</span>); <span class="hljs-comment">// Get all asset keys.</span> <span class="hljs-keyword">const</span> keys = <span class="hljs-title function_">getAssetKeys</span>(); <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(keys); <span class="hljs-comment">// ['a.jpg', 'b.txt']</span> <span class="hljs-comment">// Returns a copy of the data in an ArrayBuffer.</span> <span class="hljs-keyword">const</span> image = <span class="hljs-title function_">getAsset</span>(<span class="hljs-string">'a.jpg'</span>); <span class="hljs-comment">// Returns a string decoded from the asset as UTF8.</span> <span class="hljs-keyword">const</span> text = <span class="hljs-title function_">getAsset</span>(<span class="hljs-string">'b.txt'</span>, <span class="hljs-string">'utf8'</span>); <span class="hljs-comment">// Returns a Blob containing the asset.</span> <span class="hljs-keyword">const</span> blob = <span class="hljs-title function_">getAssetAsBlob</span>(<span class="hljs-string">'a.jpg'</span>); <span class="hljs-comment">// Returns an ArrayBuffer containing the raw asset without copying.</span> <span class="hljs-keyword">const</span> raw = <span class="hljs-title function_">getRawAsset</span>(<span class="hljs-string">'a.jpg'</span>);</code> <button class="copy-button">copy</button></pre> <p>See documentation of the <a href="#seagetassetkey-encoding"><code>sea.getAsset()</code></a>, <a href="#seagetassetasblobkey-options"><code>sea.getAssetAsBlob()</code></a>, <a href="#seagetrawassetkey"><code>sea.getRawAsset()</code></a> and <a href="#seagetassetkeys"><code>sea.getAssetKeys()</code></a> APIs for more information.</p> </div><div> <h4>Startup snapshot support<span><a class="mark" href="#startup-snapshot-support" id="startup-snapshot-support">#</a></span><a aria-hidden="true" class="legacy" id="single_executable_applications_startup_snapshot_support"></a></h4> <p>The <code>useSnapshot</code> field can be used to enable startup snapshot support. In this case the <code>main</code> script would not be when the final executable is launched. Instead, it would be run when the single executable application preparation blob is generated on the building machine. The generated preparation blob would then include a snapshot capturing the states initialized by the <code>main</code> script. The final executable with the preparation blob injected would deserialize the snapshot at run time.</p> <p>When <code>useSnapshot</code> is true, the main script must invoke the <a href="v8.html#v8startupsnapshotsetdeserializemainfunctioncallback-data"><code>v8.startupSnapshot.setDeserializeMainFunction()</code></a> API to configure code that needs to be run when the final executable is launched by the users.</p> <p>The typical pattern for an application to use snapshot in a single executable application is:</p> <ol> <li>At build time, on the building machine, the main script is run to initialize the heap to a state that's ready to take user input. The script should also configure a main function with <a href="v8.html#v8startupsnapshotsetdeserializemainfunctioncallback-data"><code>v8.startupSnapshot.setDeserializeMainFunction()</code></a>. This function will be compiled and serialized into the snapshot, but not invoked at build time.</li> <li>At run time, the main function will be run on top of the deserialized heap on the user machine to process user input and generate output.</li> </ol> <p>The general constraints of the startup snapshot scripts also apply to the main script when it's used to build snapshot for the single executable application, and the main script can use the <a href="v8.html#startup-snapshot-api"><code>v8.startupSnapshot</code> API</a> to adapt to these constraints. See <a href="cli.html#--build-snapshot">documentation about startup snapshot support in Node.js</a>.</p> </div><div> <h4>V8 code cache support<span><a class="mark" href="#v8-code-cache-support" id="v8-code-cache-support">#</a></span><a aria-hidden="true" class="legacy" id="single_executable_applications_v8_code_cache_support"></a></h4> <p>When <code>useCodeCache</code> is set to <code>true</code> in the configuration, during the generation of the single executable preparation blob, Node.js will compile the <code>main</code> script to generate the V8 code cache. The generated code cache would be part of the preparation blob and get injected into the final executable. When the single executable application is launched, instead of compiling the <code>main</code> script from scratch, Node.js would use the code cache to speed up the compilation, then execute the script, which would improve the startup performance.</p> <p><strong>Note:</strong> <code>import()</code> does not work when <code>useCodeCache</code> is <code>true</code>.</p> </div><div> <h4>Execution arguments<span><a class="mark" href="#execution-arguments" id="execution-arguments">#</a></span><a aria-hidden="true" class="legacy" id="single_executable_applications_execution_arguments"></a></h4> <p>The <code>execArgv</code> field can be used to specify Node.js-specific arguments that will be automatically applied when the single executable application starts. This allows application developers to configure Node.js runtime options without requiring end users to be aware of these flags.</p> <p>For example, the following configuration:</p> <pre><code class="language-json"><span class="hljs-punctuation">{</span> <span class="hljs-attr">"main"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/path/to/bundled/script.js"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"output"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/path/to/write/the/generated/blob.blob"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"execArgv"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">[</span><span class="hljs-string">"--no-warnings"</span><span class="hljs-punctuation">,</span> <span class="hljs-string">"--max-old-space-size=2048"</span><span class="hljs-punctuation">]</span> <span class="hljs-punctuation">}</span></code> <button class="copy-button">copy</button></pre> <p>will instruct the SEA to be launched with the <code>--no-warnings</code> and <code>--max-old-space-size=2048</code> flags. In the scripts embedded in the executable, these flags can be accessed using the <code>process.execArgv</code> property:</p> <pre><code class="language-js"><span class="hljs-comment">// If the executable is launched with `sea user-arg1 user-arg2`</span> <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(process.<span class="hljs-property">execArgv</span>); <span class="hljs-comment">// Prints: ['--no-warnings', '--max-old-space-size=2048']</span> <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(process.<span class="hljs-property">argv</span>); <span class="hljs-comment">// Prints ['/path/to/sea', 'path/to/sea', 'user-arg1', 'user-arg2']</span></code> <button class="copy-button">copy</button></pre> <p>The user-provided arguments are in the <code>process.argv</code> array starting from index 2, similar to what would happen if the application is started with:</p> <pre><code class="language-console">node --no-warnings --max-old-space-size=2048 /path/to/bundled/script.js user-arg1 user-arg2</code> <button class="copy-button">copy</button></pre> </div><div> <h4>Execution argument extension<span><a class="mark" href="#execution-argument-extension" id="execution-argument-extension">#</a></span><a aria-hidden="true" class="legacy" id="single_executable_applications_execution_argument_extension"></a></h4> <p>The <code>execArgvExtension</code> field controls how additional execution arguments can be provided beyond those specified in the <code>execArgv</code> field. It accepts one of three string values:</p> <ul> <li><code>"none"</code>: No extension is allowed. Only the arguments specified in <code>execArgv</code> will be used, and the <code>NODE_OPTIONS</code> environment variable will be ignored.</li> <li><code>"env"</code>: <em>(Default)</em> The <code>NODE_OPTIONS</code> environment variable can extend the execution arguments. This is the default behavior to maintain backward compatibility.</li> <li><code>"cli"</code>: The executable can be launched with <code>--node-options="--flag1 --flag2"</code>, and those flags will be parsed as execution arguments for Node.js instead of being passed to the user script. This allows using arguments that are not supported by the <code>NODE_OPTIONS</code> environment variable.</li> </ul> <p>For example, with <code>"execArgvExtension": "cli"</code>:</p> <pre><code class="language-json"><span class="hljs-punctuation">{</span> <span class="hljs-attr">"main"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/path/to/bundled/script.js"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"output"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"/path/to/write/the/generated/blob.blob"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"execArgv"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">[</span><span class="hljs-string">"--no-warnings"</span><span class="hljs-punctuation">]</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"execArgvExtension"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"cli"</span> <span class="hljs-punctuation">}</span></code> <button class="copy-button">copy</button></pre> <p>The executable can be launched as:</p> <pre><code class="language-console">./my-sea --node-options="--trace-exit" user-arg1 user-arg2</code> <button class="copy-button">copy</button></pre> <p>This would be equivalent to running:</p> <pre><code class="language-console">node --no-warnings --trace-exit /path/to/bundled/script.js user-arg1 user-arg2</code> <button class="copy-button">copy</button></pre> </div> </section><section><h3>In the injected main script<span><a class="mark" href="#in-the-injected-main-script" id="in-the-injected-main-script">#</a></span><a aria-hidden="true" class="legacy" id="single_executable_applications_in_the_injected_main_script"></a></h3> <div> <h4>Single-executable application API<span><a class="mark" href="#single-executable-application-api" id="single-executable-application-api">#</a></span><a aria-hidden="true" class="legacy" id="single_executable_applications_single_executable_application_api"></a></h4> <p>The <code>node:sea</code> builtin allows interaction with the single-executable application from the JavaScript main script embedded into the executable.</p> <div> <h5><code>sea.isSea()</code><span><a class="mark" href="#seaissea" id="seaissea">#</a></span><a aria-hidden="true" class="legacy" id="single_executable_applications_sea_issea"></a></h5> <div class="api_metadata"> <span>Added in: v21.7.0, v20.12.0</span> </div> <ul> <li>Returns: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type" class="type"><boolean></a> Whether this script is running inside a single-executable application.</li> </ul> </div></div><div> <h4><code>sea.getAsset(key[, encoding])</code><span><a class="mark" href="#seagetassetkey-encoding" id="seagetassetkey-encoding">#</a></span><a aria-hidden="true" class="legacy" id="single_executable_applications_sea_getasset_key_encoding"></a></h4> <div class="api_metadata"> <span>Added in: v21.7.0, v20.12.0</span> </div> <p>This method can be used to retrieve the assets configured to be bundled into the single-executable application at build time. An error is thrown when no matching asset can be found.</p> <ul> <li><code>key</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a> the key for the asset in the dictionary specified by the <code>assets</code> field in the single-executable application configuration.</li> <li><code>encoding</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a> If specified, the asset will be decoded as a string. Any encoding supported by the <code>TextDecoder</code> is accepted. If unspecified, an <code>ArrayBuffer</code> containing a copy of the asset would be returned instead.</li> <li>Returns: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a> | <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer" class="type"><ArrayBuffer></a></li> </ul> </div><div> <h4><code>sea.getAssetAsBlob(key[, options])</code><span><a class="mark" href="#seagetassetasblobkey-options" id="seagetassetasblobkey-options">#</a></span><a aria-hidden="true" class="legacy" id="single_executable_applications_sea_getassetasblob_key_options"></a></h4> <div class="api_metadata"> <span>Added in: v21.7.0, v20.12.0</span> </div> <p>Similar to <a href="#seagetassetkey-encoding"><code>sea.getAsset()</code></a>, but returns the result in a <a href="buffer.html#class-blob" class="type"><Blob></a>. An error is thrown when no matching asset can be found.</p> <ul> <li><code>key</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a> the key for the asset in the dictionary specified by the <code>assets</code> field in the single-executable application configuration.</li> <li><code>options</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object" class="type"><Object></a> <ul> <li><code>type</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a> An optional mime type for the blob.</li> </ul> </li> <li>Returns: <a href="buffer.html#class-blob" class="type"><Blob></a></li> </ul> </div><div> <h4><code>sea.getRawAsset(key)</code><span><a class="mark" href="#seagetrawassetkey" id="seagetrawassetkey">#</a></span><a aria-hidden="true" class="legacy" id="single_executable_applications_sea_getrawasset_key"></a></h4> <div class="api_metadata"> <span>Added in: v21.7.0, v20.12.0</span> </div> <p>This method can be used to retrieve the assets configured to be bundled into the single-executable application at build time. An error is thrown when no matching asset can be found.</p> <p>Unlike <code>sea.getAsset()</code> or <code>sea.getAssetAsBlob()</code>, this method does not return a copy. Instead, it returns the raw asset bundled inside the executable.</p> <p>For now, users should avoid writing to the returned array buffer. If the injected section is not marked as writable or not aligned properly, writes to the returned array buffer is likely to result in a crash.</p> <ul> <li><code>key</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a> the key for the asset in the dictionary specified by the <code>assets</code> field in the single-executable application configuration.</li> <li>Returns: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer" class="type"><ArrayBuffer></a></li> </ul> </div><div> <h4><code>sea.getAssetKeys()</code><span><a class="mark" href="#seagetassetkeys" id="seagetassetkeys">#</a></span><a aria-hidden="true" class="legacy" id="single_executable_applications_sea_getassetkeys"></a></h4> <div class="api_metadata"> <span>Added in: v22.20.0</span> </div> <ul> <li>Returns <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string[]></a> An array containing all the keys of the assets embedded in the executable. If no assets are embedded, returns an empty array.</li> </ul> <p>This method can be used to retrieve an array of all the keys of assets embedded into the single-executable application. An error is thrown when not running inside a single-executable application.</p> </div><div> <h4><code>require(id)</code> in the injected main script is not file based<span><a class="mark" href="#requireid-in-the-injected-main-script-is-not-file-based" id="requireid-in-the-injected-main-script-is-not-file-based">#</a></span><a aria-hidden="true" class="legacy" id="single_executable_applications_require_id_in_the_injected_main_script_is_not_file_based"></a></h4> <p><code>require()</code> in the injected main script is not the same as the <a href="modules.html#requireid"><code>require()</code></a> available to modules that are not injected. It also does not have any of the properties that non-injected <a href="modules.html#requireid"><code>require()</code></a> has except <a href="modules.html#accessing-the-main-module"><code>require.main</code></a>. It can only be used to load built-in modules. Attempting to load a module that can only be found in the file system will throw an error.</p> <p>Instead of relying on a file based <code>require()</code>, users can bundle their application into a standalone JavaScript file to inject into the executable. This also ensures a more deterministic dependency graph.</p> <p>However, if a file based <code>require()</code> is still needed, that can also be achieved:</p> <pre><code class="language-js"><span class="hljs-keyword">const</span> { createRequire } = <span class="hljs-built_in">require</span>(<span class="hljs-string">'node:module'</span>); <span class="hljs-built_in">require</span> = <span class="hljs-title function_">createRequire</span>(__filename);</code> <button class="copy-button">copy</button></pre> </div><div> <h4><code>__filename</code> and <code>module.filename</code> in the injected main script<span><a class="mark" href="#__filename-and-modulefilename-in-the-injected-main-script" id="__filename-and-modulefilename-in-the-injected-main-script">#</a></span><a aria-hidden="true" class="legacy" id="single_executable_applications_filename_and_module_filename_in_the_injected_main_script"></a></h4> <p>The values of <code>__filename</code> and <code>module.filename</code> in the injected main script are equal to <a href="process.html#processexecpath"><code>process.execPath</code></a>.</p> </div><div> <h4><code>__dirname</code> in the injected main script<span><a class="mark" href="#__dirname-in-the-injected-main-script" id="__dirname-in-the-injected-main-script">#</a></span><a aria-hidden="true" class="legacy" id="single_executable_applications_dirname_in_the_injected_main_script"></a></h4> <p>The value of <code>__dirname</code> in the injected main script is equal to the directory name of <a href="process.html#processexecpath"><code>process.execPath</code></a>.</p> </div> </section><section><h3>Notes<span><a class="mark" href="#notes" id="notes">#</a></span><a aria-hidden="true" class="legacy" id="single_executable_applications_notes"></a></h3> <div> <h4>Single executable application creation process<span><a class="mark" href="#single-executable-application-creation-process" id="single-executable-application-creation-process">#</a></span><a aria-hidden="true" class="legacy" id="single_executable_applications_single_executable_application_creation_process"></a></h4> <p>A tool aiming to create a single executable Node.js application must inject the contents of the blob prepared with <code>--experimental-sea-config"</code> into:</p> <ul> <li>a resource named <code>NODE_SEA_BLOB</code> if the <code>node</code> binary is a <a href="https://en.wikipedia.org/wiki/Portable_Executable">PE</a> file</li> <li>a section named <code>NODE_SEA_BLOB</code> in the <code>NODE_SEA</code> segment if the <code>node</code> binary is a <a href="https://en.wikipedia.org/wiki/Mach-O">Mach-O</a> file</li> <li>a note named <code>NODE_SEA_BLOB</code> if the <code>node</code> binary is an <a href="https://en.wikipedia.org/wiki/Executable_and_Linkable_Format">ELF</a> file</li> </ul> <p>Search the binary for the <code>NODE_SEA_FUSE_fce680ab2cc467b6e072b8b5df1996b2:0</code> <a href="https://www.electronjs.org/docs/latest/tutorial/fuses">fuse</a> string and flip the last character to <code>1</code> to indicate that a resource has been injected.</p> </div><div> <h4>Platform support<span><a class="mark" href="#platform-support" id="platform-support">#</a></span><a aria-hidden="true" class="legacy" id="single_executable_applications_platform_support"></a></h4> <p>Single-executable support is tested regularly on CI only on the following platforms:</p> <ul> <li>Windows</li> <li>macOS</li> <li>Linux (all distributions <a href="https://github.com/nodejs/node/blob/main/BUILDING.md#platform-list">supported by Node.js</a> except Alpine and all architectures <a href="https://github.com/nodejs/node/blob/main/BUILDING.md#platform-list">supported by Node.js</a> except s390x)</li> </ul> <p>This is due to a lack of better tools to generate single-executables that can be used to test this feature on other platforms.</p> <p>Suggestions for other resource injection tools/workflows are welcomed. Please start a discussion at <a href="https://github.com/nodejs/single-executable/discussions">https://github.com/nodejs/single-executable/discussions</a> to help us document them.</p></div></section> <!-- API END --> </div> </div> </div> </body> </html>