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1001cb0ef41Sopenharmony_ci <button class="theme-toggle-btn" id="theme-toggle-btn" title="Toggle dark mode/light mode" aria-label="Toggle dark mode/light mode" hidden> 1011cb0ef41Sopenharmony_ci <svg xmlns="http://www.w3.org/2000/svg" class="icon dark-icon" height="24" width="24"> 1021cb0ef41Sopenharmony_ci <path fill="none" d="M0 0h24v24H0z" /> 1031cb0ef41Sopenharmony_ci <path d="M11.1 12.08c-2.33-4.51-.5-8.48.53-10.07C6.27 2.2 1.98 6.59 1.98 12c0 .14.02.28.02.42.62-.27 1.29-.42 2-.42 1.66 0 3.18.83 4.1 2.15A4.01 4.01 0 0111 18c0 1.52-.87 2.83-2.12 3.51.98.32 2.03.5 3.11.5 3.5 0 6.58-1.8 8.37-4.52-2.36.23-6.98-.97-9.26-5.41z"/> 1041cb0ef41Sopenharmony_ci <path d="M7 16h-.18C6.4 14.84 5.3 14 4 14c-1.66 0-3 1.34-3 3s1.34 3 3 3h3c1.1 0 2-.9 2-2s-.9-2-2-2z"/> 1051cb0ef41Sopenharmony_ci </svg> 1061cb0ef41Sopenharmony_ci <svg xmlns="http://www.w3.org/2000/svg" class="icon light-icon" height="24" width="24"> 1071cb0ef41Sopenharmony_ci <path d="M0 0h24v24H0z" fill="none" /> 1081cb0ef41Sopenharmony_ci <path d="M6.76 4.84l-1.8-1.79-1.41 1.41 1.79 1.79 1.42-1.41zM4 10.5H1v2h3v-2zm9-9.95h-2V3.5h2V.55zm7.45 3.91l-1.41-1.41-1.79 1.79 1.41 1.41 1.79-1.79zm-3.21 13.7l1.79 1.8 1.41-1.41-1.8-1.79-1.4 1.4zM20 10.5v2h3v-2h-3zm-8-5c-3.31 0-6 2.69-6 6s2.69 6 6 6 6-2.69 6-6-2.69-6-6-6zm-1 16.95h2V19.5h-2v2.95zm-7.45-3.91l1.41 1.41 1.79-1.8-1.41-1.41-1.79 1.8z"/> 1091cb0ef41Sopenharmony_ci </svg> 1101cb0ef41Sopenharmony_ci </button> 1111cb0ef41Sopenharmony_ci </div> 1121cb0ef41Sopenharmony_ci <div id="gtoc"> 1131cb0ef41Sopenharmony_ci <ul> 1141cb0ef41Sopenharmony_ci <li class="pinned-header">Node.js v18.20.1</li> 1151cb0ef41Sopenharmony_ci 1161cb0ef41Sopenharmony_ci <li class="picker-header"> 1171cb0ef41Sopenharmony_ci <a href="#"> 1181cb0ef41Sopenharmony_ci <span class="collapsed-arrow">►</span><span class="expanded-arrow">▼</span> 1191cb0ef41Sopenharmony_ci Table of contents 1201cb0ef41Sopenharmony_ci </a> 1211cb0ef41Sopenharmony_ci 1221cb0ef41Sopenharmony_ci <div class="picker"><div class="toc"><ul> 1231cb0ef41Sopenharmony_ci<li><span class="stability_2"><a href="#string-decoder">String decoder</a></span> 1241cb0ef41Sopenharmony_ci<ul> 1251cb0ef41Sopenharmony_ci<li><a href="#class-stringdecoder">Class: <code>StringDecoder</code></a> 1261cb0ef41Sopenharmony_ci<ul> 1271cb0ef41Sopenharmony_ci<li><a href="#new-stringdecoderencoding"><code>new StringDecoder([encoding])</code></a></li> 1281cb0ef41Sopenharmony_ci<li><a href="#stringdecoderendbuffer"><code>stringDecoder.end([buffer])</code></a></li> 1291cb0ef41Sopenharmony_ci<li><a href="#stringdecoderwritebuffer"><code>stringDecoder.write(buffer)</code></a></li> 1301cb0ef41Sopenharmony_ci</ul> 1311cb0ef41Sopenharmony_ci</li> 1321cb0ef41Sopenharmony_ci</ul> 1331cb0ef41Sopenharmony_ci</li> 1341cb0ef41Sopenharmony_ci</ul></div></div> 1351cb0ef41Sopenharmony_ci </li> 1361cb0ef41Sopenharmony_ci 1371cb0ef41Sopenharmony_ci 1381cb0ef41Sopenharmony_ci <li class="picker-header"> 1391cb0ef41Sopenharmony_ci <a href="#"> 1401cb0ef41Sopenharmony_ci <span class="collapsed-arrow">►</span><span class="expanded-arrow">▼</span> 1411cb0ef41Sopenharmony_ci Index 1421cb0ef41Sopenharmony_ci </a> 1431cb0ef41Sopenharmony_ci 1441cb0ef41Sopenharmony_ci <div class="picker"><ul> 1451cb0ef41Sopenharmony_ci<li><a href="documentation.html" class="nav-documentation">About this documentation</a></li> 1461cb0ef41Sopenharmony_ci<li><a href="synopsis.html" class="nav-synopsis">Usage and example</a></li> 1471cb0ef41Sopenharmony_ci 1481cb0ef41Sopenharmony_ci <li> 1491cb0ef41Sopenharmony_ci <a href="index.html">Index</a> 1501cb0ef41Sopenharmony_ci </li> 1511cb0ef41Sopenharmony_ci </ul> 1521cb0ef41Sopenharmony_ci 1531cb0ef41Sopenharmony_ci<hr class="line"> 1541cb0ef41Sopenharmony_ci<ul> 1551cb0ef41Sopenharmony_ci<li><a href="assert.html" class="nav-assert">Assertion testing</a></li> 1561cb0ef41Sopenharmony_ci<li><a href="async_context.html" class="nav-async_context">Asynchronous context tracking</a></li> 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class="collapsed-arrow">►</span><span class="expanded-arrow">▼</span> 2261cb0ef41Sopenharmony_ci Other versions 2271cb0ef41Sopenharmony_ci </a> 2281cb0ef41Sopenharmony_ci <div class="picker"><ol id="alt-docs"><li><a href="https://nodejs.org/docs/latest-v21.x/api/string_decoder.html">21.x</a></li> 2291cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v20.x/api/string_decoder.html">20.x <b>LTS</b></a></li> 2301cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v19.x/api/string_decoder.html">19.x</a></li> 2311cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v18.x/api/string_decoder.html">18.x <b>LTS</b></a></li> 2321cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v17.x/api/string_decoder.html">17.x</a></li> 2331cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v16.x/api/string_decoder.html">16.x</a></li> 2341cb0ef41Sopenharmony_ci<li><a 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2431cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v6.x/api/string_decoder.html">6.x</a></li> 2441cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v5.x/api/string_decoder.html">5.x</a></li> 2451cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v4.x/api/string_decoder.html">4.x</a></li> 2461cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v0.12.x/api/string_decoder.html">0.12.x</a></li> 2471cb0ef41Sopenharmony_ci<li><a href="https://nodejs.org/docs/latest-v0.10.x/api/string_decoder.html">0.10.x</a></li></ol></div> 2481cb0ef41Sopenharmony_ci </li> 2491cb0ef41Sopenharmony_ci 2501cb0ef41Sopenharmony_ci <li class="picker-header"> 2511cb0ef41Sopenharmony_ci <a href="#"> 2521cb0ef41Sopenharmony_ci <span class="collapsed-arrow">►</span><span class="expanded-arrow">▼</span> 2531cb0ef41Sopenharmony_ci Options 2541cb0ef41Sopenharmony_ci </a> 2551cb0ef41Sopenharmony_ci 2561cb0ef41Sopenharmony_ci <div class="picker"> 2571cb0ef41Sopenharmony_ci <ul> 2581cb0ef41Sopenharmony_ci <li> 2591cb0ef41Sopenharmony_ci <a href="all.html">View on single page</a> 2601cb0ef41Sopenharmony_ci </li> 2611cb0ef41Sopenharmony_ci <li> 2621cb0ef41Sopenharmony_ci <a href="string_decoder.json">View as JSON</a> 2631cb0ef41Sopenharmony_ci </li> 2641cb0ef41Sopenharmony_ci <li class="edit_on_github"><a href="https://github.com/nodejs/node/edit/main/doc/api/string_decoder.md">Edit on GitHub</a></li> 2651cb0ef41Sopenharmony_ci </ul> 2661cb0ef41Sopenharmony_ci </div> 2671cb0ef41Sopenharmony_ci </li> 2681cb0ef41Sopenharmony_ci </ul> 2691cb0ef41Sopenharmony_ci </div> 2701cb0ef41Sopenharmony_ci <hr> 2711cb0ef41Sopenharmony_ci </header> 2721cb0ef41Sopenharmony_ci 2731cb0ef41Sopenharmony_ci <details id="toc" open><summary>Table of contents</summary><ul> 2741cb0ef41Sopenharmony_ci<li><span class="stability_2"><a href="#string-decoder">String decoder</a></span> 2751cb0ef41Sopenharmony_ci<ul> 2761cb0ef41Sopenharmony_ci<li><a href="#class-stringdecoder">Class: <code>StringDecoder</code></a> 2771cb0ef41Sopenharmony_ci<ul> 2781cb0ef41Sopenharmony_ci<li><a href="#new-stringdecoderencoding"><code>new StringDecoder([encoding])</code></a></li> 2791cb0ef41Sopenharmony_ci<li><a href="#stringdecoderendbuffer"><code>stringDecoder.end([buffer])</code></a></li> 2801cb0ef41Sopenharmony_ci<li><a href="#stringdecoderwritebuffer"><code>stringDecoder.write(buffer)</code></a></li> 2811cb0ef41Sopenharmony_ci</ul> 2821cb0ef41Sopenharmony_ci</li> 2831cb0ef41Sopenharmony_ci</ul> 2841cb0ef41Sopenharmony_ci</li> 2851cb0ef41Sopenharmony_ci</ul></details> 2861cb0ef41Sopenharmony_ci 2871cb0ef41Sopenharmony_ci <div id="apicontent"> 2881cb0ef41Sopenharmony_ci <h2>String decoder<span><a class="mark" href="#string-decoder" id="string-decoder">#</a></span><a aria-hidden="true" class="legacy" id="string_decoder_string_decoder"></a></h2> 2891cb0ef41Sopenharmony_ci 2901cb0ef41Sopenharmony_ci<p></p><div class="api_stability api_stability_2"><a href="documentation.html#stability-index">Stability: 2</a> - Stable</div><p></p> 2911cb0ef41Sopenharmony_ci<p><strong>Source Code:</strong> <a href="https://github.com/nodejs/node/blob/v18.20.1/lib/string_decoder.js">lib/string_decoder.js</a></p> 2921cb0ef41Sopenharmony_ci<p>The <code>node:string_decoder</code> module provides an API for decoding <code>Buffer</code> objects 2931cb0ef41Sopenharmony_ciinto strings in a manner that preserves encoded multi-byte UTF-8 and UTF-16 2941cb0ef41Sopenharmony_cicharacters. It can be accessed using:</p> 2951cb0ef41Sopenharmony_ci<pre><code class="language-js"><span class="hljs-keyword">const</span> { <span class="hljs-title class_">StringDecoder</span> } = <span class="hljs-built_in">require</span>(<span class="hljs-string">'node:string_decoder'</span>);</code> <button class="copy-button">copy</button></pre> 2961cb0ef41Sopenharmony_ci<p>The following example shows the basic use of the <code>StringDecoder</code> class.</p> 2971cb0ef41Sopenharmony_ci<pre><code class="language-js"><span class="hljs-keyword">const</span> { <span class="hljs-title class_">StringDecoder</span> } = <span class="hljs-built_in">require</span>(<span class="hljs-string">'node:string_decoder'</span>); 2981cb0ef41Sopenharmony_ci<span class="hljs-keyword">const</span> decoder = <span class="hljs-keyword">new</span> <span class="hljs-title class_">StringDecoder</span>(<span class="hljs-string">'utf8'</span>); 2991cb0ef41Sopenharmony_ci 3001cb0ef41Sopenharmony_ci<span class="hljs-keyword">const</span> cent = <span class="hljs-title class_">Buffer</span>.<span class="hljs-title function_">from</span>([<span class="hljs-number">0xC2</span>, <span class="hljs-number">0xA2</span>]); 3011cb0ef41Sopenharmony_ci<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(decoder.<span class="hljs-title function_">write</span>(cent)); <span class="hljs-comment">// Prints: ¢</span> 3021cb0ef41Sopenharmony_ci 3031cb0ef41Sopenharmony_ci<span class="hljs-keyword">const</span> euro = <span class="hljs-title class_">Buffer</span>.<span class="hljs-title function_">from</span>([<span class="hljs-number">0xE2</span>, <span class="hljs-number">0x82</span>, <span class="hljs-number">0xAC</span>]); 3041cb0ef41Sopenharmony_ci<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(decoder.<span class="hljs-title function_">write</span>(euro)); <span class="hljs-comment">// Prints: €</span></code> <button class="copy-button">copy</button></pre> 3051cb0ef41Sopenharmony_ci<p>When a <code>Buffer</code> instance is written to the <code>StringDecoder</code> instance, an 3061cb0ef41Sopenharmony_ciinternal buffer is used to ensure that the decoded string does not contain 3071cb0ef41Sopenharmony_ciany incomplete multibyte characters. These are held in the buffer until the 3081cb0ef41Sopenharmony_cinext call to <code>stringDecoder.write()</code> or until <code>stringDecoder.end()</code> is called.</p> 3091cb0ef41Sopenharmony_ci<p>In the following example, the three UTF-8 encoded bytes of the European Euro 3101cb0ef41Sopenharmony_cisymbol (<code>€</code>) are written over three separate operations:</p> 3111cb0ef41Sopenharmony_ci<pre><code class="language-js"><span class="hljs-keyword">const</span> { <span class="hljs-title class_">StringDecoder</span> } = <span class="hljs-built_in">require</span>(<span class="hljs-string">'node:string_decoder'</span>); 3121cb0ef41Sopenharmony_ci<span class="hljs-keyword">const</span> decoder = <span class="hljs-keyword">new</span> <span class="hljs-title class_">StringDecoder</span>(<span class="hljs-string">'utf8'</span>); 3131cb0ef41Sopenharmony_ci 3141cb0ef41Sopenharmony_cidecoder.<span class="hljs-title function_">write</span>(<span class="hljs-title class_">Buffer</span>.<span class="hljs-title function_">from</span>([<span class="hljs-number">0xE2</span>])); 3151cb0ef41Sopenharmony_cidecoder.<span class="hljs-title function_">write</span>(<span class="hljs-title class_">Buffer</span>.<span class="hljs-title function_">from</span>([<span class="hljs-number">0x82</span>])); 3161cb0ef41Sopenharmony_ci<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(decoder.<span class="hljs-title function_">end</span>(<span class="hljs-title class_">Buffer</span>.<span class="hljs-title function_">from</span>([<span class="hljs-number">0xAC</span>]))); <span class="hljs-comment">// Prints: €</span></code> <button class="copy-button">copy</button></pre> 3171cb0ef41Sopenharmony_ci<section><h3>Class: <code>StringDecoder</code><span><a class="mark" href="#class-stringdecoder" id="class-stringdecoder">#</a></span><a aria-hidden="true" class="legacy" id="string_decoder_class_stringdecoder"></a></h3> 3181cb0ef41Sopenharmony_ci<h4><code>new StringDecoder([encoding])</code><span><a class="mark" href="#new-stringdecoderencoding" id="new-stringdecoderencoding">#</a></span><a aria-hidden="true" class="legacy" id="string_decoder_new_stringdecoder_encoding"></a></h4> 3191cb0ef41Sopenharmony_ci<div class="api_metadata"> 3201cb0ef41Sopenharmony_ci<span>Added in: v0.1.99</span> 3211cb0ef41Sopenharmony_ci</div> 3221cb0ef41Sopenharmony_ci<ul> 3231cb0ef41Sopenharmony_ci<li><code>encoding</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a> The character <a href="buffer.html#buffers-and-character-encodings">encoding</a> the <code>StringDecoder</code> will use. 3241cb0ef41Sopenharmony_ci<strong>Default:</strong> <code>'utf8'</code>.</li> 3251cb0ef41Sopenharmony_ci</ul> 3261cb0ef41Sopenharmony_ci<p>Creates a new <code>StringDecoder</code> instance.</p> 3271cb0ef41Sopenharmony_ci<h4><code>stringDecoder.end([buffer])</code><span><a class="mark" href="#stringdecoderendbuffer" id="stringdecoderendbuffer">#</a></span><a aria-hidden="true" class="legacy" id="string_decoder_stringdecoder_end_buffer"></a></h4> 3281cb0ef41Sopenharmony_ci<div class="api_metadata"> 3291cb0ef41Sopenharmony_ci<span>Added in: v0.9.3</span> 3301cb0ef41Sopenharmony_ci</div> 3311cb0ef41Sopenharmony_ci<ul> 3321cb0ef41Sopenharmony_ci<li><code>buffer</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a> | <a href="buffer.html#class-buffer" class="type"><Buffer></a> | <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray" class="type"><TypedArray></a> | <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView" class="type"><DataView></a> The bytes to decode.</li> 3331cb0ef41Sopenharmony_ci<li>Returns: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a></li> 3341cb0ef41Sopenharmony_ci</ul> 3351cb0ef41Sopenharmony_ci<p>Returns any remaining input stored in the internal buffer as a string. Bytes 3361cb0ef41Sopenharmony_cirepresenting incomplete UTF-8 and UTF-16 characters will be replaced with 3371cb0ef41Sopenharmony_cisubstitution characters appropriate for the character encoding.</p> 3381cb0ef41Sopenharmony_ci<p>If the <code>buffer</code> argument is provided, one final call to <code>stringDecoder.write()</code> 3391cb0ef41Sopenharmony_ciis performed before returning the remaining input. 3401cb0ef41Sopenharmony_ciAfter <code>end()</code> is called, the <code>stringDecoder</code> object can be reused for new input.</p> 3411cb0ef41Sopenharmony_ci<h4><code>stringDecoder.write(buffer)</code><span><a class="mark" href="#stringdecoderwritebuffer" id="stringdecoderwritebuffer">#</a></span><a aria-hidden="true" class="legacy" id="string_decoder_stringdecoder_write_buffer"></a></h4> 3421cb0ef41Sopenharmony_ci<div class="api_metadata"> 3431cb0ef41Sopenharmony_ci<details class="changelog"><summary>History</summary> 3441cb0ef41Sopenharmony_ci<table> 3451cb0ef41Sopenharmony_ci<tbody><tr><th>Version</th><th>Changes</th></tr> 3461cb0ef41Sopenharmony_ci<tr><td>v8.0.0</td> 3471cb0ef41Sopenharmony_ci<td><p>Each invalid character is now replaced by a single replacement character instead of one for each individual byte.</p></td></tr> 3481cb0ef41Sopenharmony_ci<tr><td>v0.1.99</td> 3491cb0ef41Sopenharmony_ci<td><p><span>Added in: v0.1.99</span></p></td></tr> 3501cb0ef41Sopenharmony_ci</tbody></table> 3511cb0ef41Sopenharmony_ci</details> 3521cb0ef41Sopenharmony_ci</div> 3531cb0ef41Sopenharmony_ci<ul> 3541cb0ef41Sopenharmony_ci<li><code>buffer</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a> | <a href="buffer.html#class-buffer" class="type"><Buffer></a> | <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray" class="type"><TypedArray></a> | <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView" class="type"><DataView></a> The bytes to decode.</li> 3551cb0ef41Sopenharmony_ci<li>Returns: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a></li> 3561cb0ef41Sopenharmony_ci</ul> 3571cb0ef41Sopenharmony_ci<p>Returns a decoded string, ensuring that any incomplete multibyte characters at 3581cb0ef41Sopenharmony_cithe end of the <code>Buffer</code>, or <code>TypedArray</code>, or <code>DataView</code> are omitted from the 3591cb0ef41Sopenharmony_cireturned string and stored in an internal buffer for the next call to 3601cb0ef41Sopenharmony_ci<code>stringDecoder.write()</code> or <code>stringDecoder.end()</code>.</p></section> 3611cb0ef41Sopenharmony_ci <!-- API END --> 3621cb0ef41Sopenharmony_ci </div> 3631cb0ef41Sopenharmony_ci </div> 3641cb0ef41Sopenharmony_ci </div> 3651cb0ef41Sopenharmony_ci</body> 3661cb0ef41Sopenharmony_ci</html> 367