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PATH: usr / share / doc / nodejs-docs-16.20.2 / doc / api

{
 "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": "Source Code: <a href=\"https://github.com/nodejs/node/blob/v16.20.2/lib/string_decoder.js\">lib/string_decoder.js</a>\nThe <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:\n<pre><code class=\"language-js\">const { StringDecoder } = require('node:string_decoder');\n</code></pre>\nThe following example shows the basic use of the <code>StringDecoder</code> class.\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>\nWhen 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.\nIn the following example, the three UTF-8 encoded bytes of the European Euro\nsymbol (<code>€</code>) are written over three separate operations:\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": "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.\nIf 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."
 },
 {
 "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": "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>."
 }
 ],
 "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": "Creates a new <code>StringDecoder</code> instance."
 }
 ]
 }
 ],
 "type": "module",
 "displayName": "String decoder"
 }
 ]
}

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