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{
"type": "module",
"source": "doc/api/string_decoder.md",
"modules": [
{
"textRaw": "String decoder",
"name": "string_decoder",
"introduced_in": "v0.10.0",
"stability": 2,
"stabilityText": "Stable",
"desc": "<p><strong>Source Code:</strong> <a href=\"https://github.com/nodejs/node/blob/v16.18.1/lib/string_decoder.js\">lib/string_decoder.js</a></p>\n<p>The <code>node:string_decoder</code> module provides an API for decoding <code>Buffer</code> objects\ninto strings in a manner that preserves encoded multi-byte UTF-8 and UTF-16\ncharacters. It can be accessed using:</p>\n<pre><code class=\"language-js\">const { StringDecoder } = require('node:string_decoder');\n</code></pre>\n<p>The following example shows the basic use of the <code>StringDecoder</code> class.</p>\n<pre><code class=\"language-js\">const { StringDecoder } = require('node:string_decoder');\nconst decoder = new StringDecoder('utf8');\n\nconst cent = Buffer.from([0xC2, 0xA2]);\nconsole.log(decoder.write(cent));\n\nconst euro = Buffer.from([0xE2, 0x82, 0xAC]);\nconsole.log(decoder.write(euro));\n</code></pre>\n<p>When a <code>Buffer</code> instance is written to the <code>StringDecoder</code> instance, an\ninternal buffer is used to ensure that the decoded string does not contain\nany incomplete multibyte characters. These are held in the buffer until the\nnext call to <code>stringDecoder.write()</code> or until <code>stringDecoder.end()</code> is called.</p>\n<p>In the following example, the three UTF-8 encoded bytes of the European Euro\nsymbol (<code>€</code>) are written over three separate operations:</p>\n<pre><code class=\"language-js\">const { StringDecoder } = require('node:string_decoder');\nconst decoder = new StringDecoder('utf8');\n\ndecoder.write(Buffer.from([0xE2]));\ndecoder.write(Buffer.from([0x82]));\nconsole.log(decoder.end(Buffer.from([0xAC])));\n</code></pre>",
"classes": [
{
"textRaw": "Class: `StringDecoder`",
"type": "class",
"name": "StringDecoder",
"methods": [
{
"textRaw": "`stringDecoder.end([buffer])`",
"type": "method",
"name": "end",
"meta": {
"added": [
"v0.9.3"
],
"changes": []
},
"signatures": [
{
"return": {
"textRaw": "Returns: {string}",
"name": "return",
"type": "string"
},
"params": [
{
"textRaw": "`buffer` {Buffer|TypedArray|DataView} A `Buffer`, or `TypedArray`, or `DataView` containing the bytes to decode.",
"name": "buffer",
"type": "Buffer|TypedArray|DataView",
"desc": "A `Buffer`, or `TypedArray`, or `DataView` containing the bytes to decode."
}
]
}
],
"desc": "<p>Returns any remaining input stored in the internal buffer as a string. Bytes\nrepresenting incomplete UTF-8 and UTF-16 characters will be replaced with\nsubstitution characters appropriate for the character encoding.</p>\n<p>If the <code>buffer</code> argument is provided, one final call to <code>stringDecoder.write()</code>\nis performed before returning the remaining input.\nAfter <code>end()</code> is called, the <code>stringDecoder</code> object can be reused for new input.</p>"
},
{
"textRaw": "`stringDecoder.write(buffer)`",
"type": "method",
"name": "write",
"meta": {
"added": [
"v0.1.99"
],
"changes": [
{
"version": "v8.0.0",
"pr-url": "https://github.com/nodejs/node/pull/9618",
"description": "Each invalid character is now replaced by a single replacement character instead of one for each individual byte."
}
]
},
"signatures": [
{
"return": {
"textRaw": "Returns: {string}",
"name": "return",
"type": "string"
},
"params": [
{
"textRaw": "`buffer` {Buffer|TypedArray|DataView} A `Buffer`, or `TypedArray`, or `DataView` containing the bytes to decode.",
"name": "buffer",
"type": "Buffer|TypedArray|DataView",
"desc": "A `Buffer`, or `TypedArray`, or `DataView` containing the bytes to decode."
}
]
}
],
"desc": "<p>Returns a decoded string, ensuring that any incomplete multibyte characters at\nthe end of the <code>Buffer</code>, or <code>TypedArray</code>, or <code>DataView</code> are omitted from the\nreturned string and stored in an internal buffer for the next call to\n<code>stringDecoder.write()</code> or <code>stringDecoder.end()</code>.</p>"
}
],
"signatures": [
{
"params": [
{
"textRaw": "`encoding` {string} The character [encoding][] the `StringDecoder` will use. **Default:** `'utf8'`.",
"name": "encoding",
"type": "string",
"default": "`'utf8'`",
"desc": "The character [encoding][] the `StringDecoder` will use."
}
],
"desc": "<p>Creates a new <code>StringDecoder</code> instance.</p>"
}
]
}
],
"type": "module",
"displayName": "String decoder"
}
]
}
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