Signid

Signid is a tiny node.js server-side library for signing and verifying integer identifiers. Identifiers can be signed to prevent a prediction of next values.

Look at how simple it is:

const Signid = require('signid')
const signid = new Signid('Your secret key')

const signed = signid.encode(18082)
console.log(signed) // '1tkblhp-dya'

const originalId = signid.decode(signed)
console.log(originalId) // 18082

const signid2 = new Signid('Incorrect secret')
const originalId2 = signid2.decode(signed)
console.log(originalId2) // null

Note that this is not an encryption library and is not suitable for creating something safe. It doesn't withstand any security requirements.

Features

• Server-side code (uses node crypto md5)
• Simple usage
• Signed integer as string about (7-20 chars length)
• Supports positive integers only (0 - Number.MAX_SAFE_INTEGER)

Install

Using NPM:

npm i signid

Signed identifiers example

ID	Signed
0	'fmh1hp-0'
1	'1invht9-1'
2	'j3c2f3-2'
3	'1tp4u3p-3'
100	'1f9pfif-2s'
1000	'1ekln37-rs'
1001	'1b3b3xt-rt'
1002	'105opf1-ru'
88888	'1buzr2q-1wl4'
9007199254740991	'iim0na-2gosa7pa2gv' (Number.MAX_SAFE_INTEGER)

P.S. This table is generated with secret Your secret