Last active
September 14, 2023 12:17
-
-
Save aryomuzakki/b0fa350abcfa93598c8ce57883933d38 to your computer and use it in GitHub Desktop.
Generate Random Number and String in Javascript, using Math.random(), Node JS Crypto (server side), or Web Crypto API (client side / browser)
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| // nodejs crypto (server side) | |
| // Math.random() replacement | |
| const cryptoRandom = () => parseInt(require("crypto").randomBytes(4).toString("hex"), 16) / (0xffffffff + 1) | |
| // generate random number integer based on minimum and maximum | |
| const cryptoRandomNumber = (min, max) => require("crypto").randomInt(min, max + 1) | |
| // generate random string (hex/base64) based on bytes | |
| const cryptoRandomString = (bytes, encoding = "hex") => require("crypto").randomBytes(bytes).toString(encoding) | |
| // generate random string (hex/base64) based on char length | |
| const cryptoRandomString = (charLength, encoding = "hex") => { | |
| return require("crypto").randomBytes(Math.ceil(charLength / 2)).toString(encoding).substring(0,charLength) | |
| } | |
| // browser crypto (client side) | |
| // Math.random() replacement | |
| const cryptoRandom = () => window.crypto.getRandomValues(new Uint32Array(1))[0] / (0xffffffff + 1) | |
| // generate random string (hex) based on char length | |
| const cryptoRandomString = (charLength) => { | |
| return Array.from(window.crypto.getRandomValues(new Uint8Array(Math.ceil(charLength / 2)))) | |
| .map(dec => dec.toString(16).padStart(2, "0")).join("").substring(0, charLength) | |
| } | |
| // use defined cryptoRandom function | |
| // generate random number integer based on minimum and maximum | |
| const cryptoRandomNumber = (min, max) => Math.floor(cryptoRandom() * (max - min + 1) + min) | |
| // generate random string from a charset, based on char length | |
| const cryptoRandomString = (charLength, charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789") => { | |
| return Array.apply(null, Array(charLength)).map( () => charset.charAt(Math.floor(cryptoRandom() * charset.length)) ).join(''); | |
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| // generate random number integer based on minimum and maximum value defined | |
| const randomNumber = (min, max) => Math.floor(Math.random() * (max - min + 1) + min) | |
| // generate random number based on number of digits defined (3 digits = number in range 100 to 999) | |
| const randomNumberByDigits = (digits) => { | |
| return Math.floor(Math.random() * (Math.pow(10, digits) - Math.pow(10, digits - 1) + 1) + Math.pow(10, digits - 1)) | |
| } | |
| // or | |
| const randomNumberByDigits = (digits) => randomNumber(Math.pow(10, digits - 1), Math.pow(10, digits)) | |
| // generate random string from a charset, based on char length | |
| const randomString = (charLength, charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789") => { | |
| return Array.apply(null, Array(charLength)).map( () => charset.charAt(Math.floor(Math.random() * charset.length)) ).join(''); | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment