CODEWITHSUNDEEP
node.jshashhashids
JuanPablo
JuanPablo

Reputation: 24804

get hash from strings, like hashids

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)

Upvotes: 21

Views: 9953

Answers (3)

Tobi
Tobi

Reputation: 2828

here's a quick implementation for sqids.js (formerly hashids), using code from hashids.encodeHex method and includes the buffer toString hex workaround from @roman-rhrn-nesterov above:

function convertStringToNumbers(input) {
    const hex = Buffer.from(input).toString('hex');
    return Array.from({ length: Math.ceil(hex.length / 12) }, (_, i) => Number.parseInt(`1${hex.slice(i * 12, (i + 1) * 12)}`, 16));
}

const sqids = new Sqids()
const id = sqids.encode( convertStringToNumbers( 'any string' ) );

! This code does not provide a decode method, you have to adapt decodeHex() for that part.

Upvotes: 0

Banned
Banned

Reputation: 9

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)),"");

Upvotes: 1

Roman Rhrn Nesterov
Roman Rhrn Nesterov

Reputation: 3673

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'

Upvotes: 37

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