A Simple Way to Use NPM Library in Browser

Occasionally, we need to use a JS library in our browser side, yet it's only available from the NPM repository.

As usual, the Google result of any NPM related questions will bring you more yes-and-no answers, and leave you in further confusions and headaches.

Well, life better be simpler 🙂

Say, we are going to use the NPM library of email-js-mime-parser and buffer in the browser, all we need to do is:

1. install browserify tool

npm install -g browserify


2. install npm libraries

npm install emailjs-mime-parser
npm install buffer


3. create a new JS file, main.js

var parse = require('emailjs-mime-parser').default
var Buffer = require('buffer').Buffer
global.window.parseEmail = parse
global.window.Buffer = Buffer


4. compile the main.js:

browserify main.js -o bundle.js


5. use bundle.js in normal webpage, and you could use parseEmail and Buffer in the browser side JS:

<script src='bundle.js'>


(Note that default is needed for emailjs-mime-parser because of legacy export syntax.)


And that's all 🎆