Selectively replace Node-style environment variables with plain strings.

npm install envify
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envify Build Status stable

Selectively replace Node-style environment variables with plain strings. Available as a standalone CLI tool and a Browserify v2 transform.

Works best in combination with uglifyify.


If you're using the module with Browserify:

npm install envify browserify

Or, for the CLI:

sudo npm install -g envify


envify will replace your environment variable checks with ordinary strings - only the variables you use will be included, so you don't have to worry about, say, AWS_SECRET_KEY leaking through either. Take this example script:

if (process.env.NODE_ENV === "development") {
  console.log('development only')

After running it through envify with NODE_ENV set to production, you'll get this:

if ("production" === "development") {
  console.log('development only')

By running this through a good minifier (e.g. UglifyJS2), the above code would be stripped out completely.

CLI Usage

With browserify:

browserify index.js -t envify > bundle.js

Or standalone:

envify index.js > bundle.js

You can also specify additional custom environment variables using browserify's subarg syntax, which is available in versions 3.25.0 and above:

browserify index.js -t [ envify --NODE_ENV development ] > bundle.js
browserify index.js -t [ envify --NODE_ENV production  ] > bundle.js

Module Usage


Returns a transform stream that updates based on the Node process' process.env object.


If you want to stay away from your environment variables, you can supply your own object to use in its place:

var browserify = require('browserify')
  , envify = require('envify/custom')
  , fs = require('fs')

var b = browserify('main.js')
  , output = fs.createWriteStream('bundle.js')

  NODE_ENV: 'development'


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