Node.js Cheat Sheet

Common things I do in node.

Generate a Secure Random String

16-byte (128-bit) random url-safe base64-encoded string:

let crypto = require('crypto');

crypto
    .randomBytes(16)
    .toString('base64')
    .replace(/\+/g, '-')
    .replace(/\//g, '_')
    .replace(/=/g, '');
function rnd(len, enc) {
  let crypto = require('crypto');
  return crypto
    .randomBytes(len || 16)
    .toString(enc || 'base64')
    .replace(/\+/g, '-')
    .replace(/\//g, '_')
    .replace(/=/g, '');
}

Hash some Bytes

let str = "Hello, 🌎!"; // or hex, base64, etc
let buf = Buffer.from(str, 'utf-8');
crypto.createHash('sha256').update(buf).digest('base64');