webhacking/sequence-shorten

Shorten your sequence number or hash key. (if you want to make url shortener on your product this will be help you)

Sequence Shorten

Shorten your sequence number or hash key.

Install

npm i sequence-shorten

Usage

If u want to encode ur sequence number or hash key.

import SequenceShorten from 'sequence-shorten';
const sequenceNumber = 19950824;


// Result: bvShE
(new SequenceShorten).encode(sequenceNumber);


// If you care about security,
// You can encrypt the value by adding the encoder and decoder as argument values
// When you create the object as shown below
const encoder = (value: number): number => {
  const key = Math.floor(Math.random() * 0xff) + 0x01;
  return ((value ^ key) << 8) | key;
};

const decoder = (value: number): number => {
  const key = value & 0xff;
  return (value >> 8) ^ key;
};

(new SequenceShorten(encoder, decoder)).encode(sequenceNumber);

Or want to decode like below.

import SequenceShorten from 'sequence-shorten';
const sequenceNumber = 19950824;
const encodedNumber = (new SequenceShorten).encode(sequenceNumber);

// Result: 19950824
(new SequenceShorten).decode(encodedNumber);

Comment

• There must be no x1, x2 (with x1 ≠ x2) that will make f(x1) = f(x2),
• and for every y you must be able to find an x so that f(x) = y.