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class="pinned-header">Node.js v18.18.2</li> 115 116 <li class="picker-header"> 117 <a href="#"> 118 <span class="collapsed-arrow">►</span><span class="expanded-arrow">▼</span> 119 Table of contents 120 </a> 121 122 <div class="picker"><div class="toc"><ul> 123<li><span class="stability_2"><a href="#string-decoder">String decoder</a></span> 124<ul> 125<li><a href="#class-stringdecoder">Class: <code>StringDecoder</code></a> 126<ul> 127<li><a href="#new-stringdecoderencoding"><code>new StringDecoder([encoding])</code></a></li> 128<li><a href="#stringdecoderendbuffer"><code>stringDecoder.end([buffer])</code></a></li> 129<li><a href="#stringdecoderwritebuffer"><code>stringDecoder.write(buffer)</code></a></li> 130</ul> 131</li> 132</ul> 133</li> 134</ul></div></div> 135 </li> 136 137 138 <li class="picker-header"> 139 <a href="#"> 140 <span class="collapsed-arrow">►</span><span class="expanded-arrow">▼</span> 141 Index 142 </a> 143 144 <div class="picker"><ul> 145<li><a 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href="https://nodejs.org/docs/latest-v20.x/api/string_decoder.html">20.x</a></li> 229<li><a href="https://nodejs.org/docs/latest-v19.x/api/string_decoder.html">19.x</a></li> 230<li><a href="https://nodejs.org/docs/latest-v18.x/api/string_decoder.html">18.x <b>LTS</b></a></li> 231<li><a href="https://nodejs.org/docs/latest-v17.x/api/string_decoder.html">17.x</a></li> 232<li><a href="https://nodejs.org/docs/latest-v16.x/api/string_decoder.html">16.x</a></li> 233<li><a href="https://nodejs.org/docs/latest-v15.x/api/string_decoder.html">15.x</a></li> 234<li><a href="https://nodejs.org/docs/latest-v14.x/api/string_decoder.html">14.x</a></li> 235<li><a href="https://nodejs.org/docs/latest-v13.x/api/string_decoder.html">13.x</a></li> 236<li><a href="https://nodejs.org/docs/latest-v12.x/api/string_decoder.html">12.x</a></li> 237<li><a href="https://nodejs.org/docs/latest-v11.x/api/string_decoder.html">11.x</a></li> 238<li><a href="https://nodejs.org/docs/latest-v10.x/api/string_decoder.html">10.x</a></li> 239<li><a href="https://nodejs.org/docs/latest-v9.x/api/string_decoder.html">9.x</a></li> 240<li><a href="https://nodejs.org/docs/latest-v8.x/api/string_decoder.html">8.x</a></li> 241<li><a href="https://nodejs.org/docs/latest-v7.x/api/string_decoder.html">7.x</a></li> 242<li><a href="https://nodejs.org/docs/latest-v6.x/api/string_decoder.html">6.x</a></li> 243<li><a href="https://nodejs.org/docs/latest-v5.x/api/string_decoder.html">5.x</a></li> 244<li><a href="https://nodejs.org/docs/latest-v4.x/api/string_decoder.html">4.x</a></li> 245<li><a href="https://nodejs.org/docs/latest-v0.12.x/api/string_decoder.html">0.12.x</a></li> 246<li><a href="https://nodejs.org/docs/latest-v0.10.x/api/string_decoder.html">0.10.x</a></li></ol></div> 247 </li> 248 249 <li class="picker-header"> 250 <a href="#"> 251 <span class="collapsed-arrow">►</span><span class="expanded-arrow">▼</span> 252 Options 253 </a> 254 255 <div class="picker"> 256 <ul> 257 <li> 258 <a href="all.html">View on single page</a> 259 </li> 260 <li> 261 <a href="string_decoder.json">View as JSON</a> 262 </li> 263 <li class="edit_on_github"><a href="https://github.com/nodejs/node/edit/main/doc/api/string_decoder.md">Edit on GitHub</a></li> 264 </ul> 265 </div> 266 </li> 267 </ul> 268 </div> 269 <hr> 270 </header> 271 272 <details id="toc" open><summary>Table of contents</summary><ul> 273<li><span class="stability_2"><a href="#string-decoder">String decoder</a></span> 274<ul> 275<li><a href="#class-stringdecoder">Class: <code>StringDecoder</code></a> 276<ul> 277<li><a href="#new-stringdecoderencoding"><code>new StringDecoder([encoding])</code></a></li> 278<li><a href="#stringdecoderendbuffer"><code>stringDecoder.end([buffer])</code></a></li> 279<li><a href="#stringdecoderwritebuffer"><code>stringDecoder.write(buffer)</code></a></li> 280</ul> 281</li> 282</ul> 283</li> 284</ul></details> 285 286 <div id="apicontent"> 287 <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> 288 289<p></p><div class="api_stability api_stability_2"><a href="documentation.html#stability-index">Stability: 2</a> - Stable</div><p></p> 290<p><strong>Source Code:</strong> <a href="https://github.com/nodejs/node/blob/v18.18.2/lib/string_decoder.js">lib/string_decoder.js</a></p> 291<p>The <code>node:string_decoder</code> module provides an API for decoding <code>Buffer</code> objects 292into strings in a manner that preserves encoded multi-byte UTF-8 and UTF-16 293characters. It can be accessed using:</p> 294<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> 295<p>The following example shows the basic use of the <code>StringDecoder</code> class.</p> 296<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>); 297<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>); 298 299<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>]); 300<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(decoder.<span class="hljs-title function_">write</span>(cent)); 301 302<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>]); 303<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(decoder.<span class="hljs-title function_">write</span>(euro));</code> <button class="copy-button">copy</button></pre> 304<p>When a <code>Buffer</code> instance is written to the <code>StringDecoder</code> instance, an 305internal buffer is used to ensure that the decoded string does not contain 306any incomplete multibyte characters. These are held in the buffer until the 307next call to <code>stringDecoder.write()</code> or until <code>stringDecoder.end()</code> is called.</p> 308<p>In the following example, the three UTF-8 encoded bytes of the European Euro 309symbol (<code>€</code>) are written over three separate operations:</p> 310<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>); 311<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>); 312 313decoder.<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>])); 314decoder.<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>])); 315<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>])));</code> <button class="copy-button">copy</button></pre> 316<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> 317<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> 318<div class="api_metadata"> 319<span>Added in: v0.1.99</span> 320</div> 321<ul> 322<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. 323<strong>Default:</strong> <code>'utf8'</code>.</li> 324</ul> 325<p>Creates a new <code>StringDecoder</code> instance.</p> 326<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> 327<div class="api_metadata"> 328<span>Added in: v0.9.3</span> 329</div> 330<ul> 331<li><code>buffer</code> <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> A <code>Buffer</code>, or <code>TypedArray</code>, or 332<code>DataView</code> containing the bytes to decode.</li> 333<li>Returns: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a></li> 334</ul> 335<p>Returns any remaining input stored in the internal buffer as a string. Bytes 336representing incomplete UTF-8 and UTF-16 characters will be replaced with 337substitution characters appropriate for the character encoding.</p> 338<p>If the <code>buffer</code> argument is provided, one final call to <code>stringDecoder.write()</code> 339is performed before returning the remaining input. 340After <code>end()</code> is called, the <code>stringDecoder</code> object can be reused for new input.</p> 341<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> 342<div class="api_metadata"> 343<details class="changelog"><summary>History</summary> 344<table> 345<tbody><tr><th>Version</th><th>Changes</th></tr> 346<tr><td>v8.0.0</td> 347<td><p>Each invalid character is now replaced by a single replacement character instead of one for each individual byte.</p></td></tr> 348<tr><td>v0.1.99</td> 349<td><p><span>Added in: v0.1.99</span></p></td></tr> 350</tbody></table> 351</details> 352</div> 353<ul> 354<li><code>buffer</code> <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> A <code>Buffer</code>, or <code>TypedArray</code>, or 355<code>DataView</code> containing the bytes to decode.</li> 356<li>Returns: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a></li> 357</ul> 358<p>Returns a decoded string, ensuring that any incomplete multibyte characters at 359the end of the <code>Buffer</code>, or <code>TypedArray</code>, or <code>DataView</code> are omitted from the 360returned string and stored in an internal buffer for the next call to 361<code>stringDecoder.write()</code> or <code>stringDecoder.end()</code>.</p></section> 362 <!-- API END --> 363 </div> 364 </div> 365 </div> 366</body> 367</html> 368