Node.js TextEncoder
Last Updated :
11 Jul, 2022
The TextEncoder is an interface that takes a stream of code points as input and emits a stream of encoded UTF-8 codes. This is provided in NodeJS as an implementation of the WHATWG Encoding Standard ‘TextEncoder’ API. All instances of TextEncoder only support UTF-8 encoding.
UTF-8: It is an encoding mechanism that encodes in multiple 8 bits. It is capable of encoding all 1,112,064 characters in 4 bytes, each of 8 bits. The first 128 characters match the ASCII mapping.
Import:
var util = require('util');
Syntax:
util.TextEncoder( );
Constructor:
- TextEncoder( ): This method will return an new object of TextEncoder class which can generated encoding of UTF-8 format.
Properties:
The TextEncoder class does not inherit any property. Only one property is defined which is:
- TextEncoder.prototype.encoding: It is a read-only property that returns a string of the name of the encoding used by the object. It always returns UTF-8.
Functions:
- encode(string): returns Uint8Array from a ‘string’.
- encodeInto(string, dest): takes two parameters Input first is the input string and the second is the output array. It encodes ‘string’ into ‘dest’ that must be Uint8Array.
Return Value: Returns an array corresponding to encoding format containing code points representing input.
Example 1: We will encode and save the output in a local variable and print it on the console to check the encoded value. Create a file index.js and write the below code:
Javascript
var util = require( 'util' );
let encoder = new util.TextEncoder();
let uint8Array = encoder.encode( "Hello" );
console.log(uint8Array);
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Steps to run the application: Write the below command in the terminal to start the server:
node index.js
Output:
Uint8Array [ 72, 101, 108, 108, 111 ]
Example 2: We will now encode the string into an output array bigger than the size of the input to see how they function encodes. Create a file index.js and write the below code:
Javascript
var util = require( 'util' );
let encoder = new util.TextEncoder();
let src = "Hello" ;
let uint8Array = new Uint8Array(10);
encoder.encodeInto(src, uint8Array);
console.log(uint8Array);
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Steps to run the application: Write the below command in the terminal to start the server:
node index.js
Output:
Uint8Array(10) [ 72, 101, 108, 108, 111,0, 0, 0, 0, 0]
Browser Compatibility:
BROWSER |
VERSION SUPPORTED |
Chrome |
38 |
Edge |
79 |
Firefox |
18 |
Internet Explorer |
NOT SUPPORTED |
Opera |
25 |
Safari |
10.1 |
Android WebView |
38 |
Deno |
1.0 |
NodeJS |
8.3.0 |
Samsung Internet |
3.0 |
Safari iOS |
10.3 |
Reference: https://nodejs.org/api/util.html#class-utiltextencoder
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