Pass in a string, get a buffer back. Pass in a buffer, get the same buffer back.
npm install to-buffer
var toBuffer = require('to-buffer')
console.log(toBuffer('hi')) // <Buffer 68 69>
console.log(toBuffer(Buffer('hi'))) // <Buffer 68 69>
console.log(toBuffer('6869', 'hex')) // <Buffer 68 69>
console.log(toBuffer(43)) // throws
MIT