get hash from strings, like hashids

Question

Using the package hashids, I can obtain hashes (with encode and decode) from numbers.

    var Hashids = require("hashids"),
        hashids = new Hashids("this is my salt", 8);
    
    var id = hashids.encode(1);

Is there a similar package to obtain hashes from strings? (with encode and decode)

score 37 · Answer 1 · edited Jan 27 '21 at 07:42

37

var Hashids = require("hashids");
var hashids = new Hashids("this is my salt");

var hex = Buffer.from('Hello World', 'utf8').toString('hex');
console.log (hex); // '48656c6c6f20576f726c64'

var encoded = hashids.encodeHex(hex);
console.log (encoded); // 'rZ4pPgYxegCarB3eXbg'

var decodedHex = hashids.decodeHex('rZ4pPgYxegCarB3eXbg');
console.log (decodedHex); // '48656c6c6f20576f726c64'

var string = Buffer.from('48656c6c6f20576f726c64', 'hex').toString('utf8');
console.log (string); // 'Hello World'

edited Jan 27 '21 at 07:42

Danail

1,997
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answered Nov 25 '14 at 21:39

Roman Rhrn Nesterov

3,538
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1

Buffer? Where can I find it? Thanks! – Eusthace May 02 '17 at 00:54
Client-side? Browser...:) – Eusthace Jun 28 '17 at 22:50
1

@Eusthace Buffer is part of Node.js core api - https://nodejs.org/api/buffer.html#buffer_buf_tostring_encoding_start_end You can use https://www.npmjs.com/package/buffer for browser support – Danail Jan 26 '21 at 22:16

score 1 · Answer 2 · answered Jun 04 '21 at 02:39

Getting hex without Node's Buffer.from ( to use with hashids.decodeHex)

const toHex = (str: string): string => str.split("")
        .reduce((hex, c) => hex += c.charCodeAt(0).toString(16).padStart(2, "0"), "")
const toUTF8 = (num: string): string =>
        num.match(/.{1,2}/g)
            .reduce((acc, char) => acc + String.fromCharCode(parseInt(char, 16)),"");

get hash from strings, like hashids

2 Answers2