express-mung

express-mung

This package allows synchronous and asynchronous transformation of an express response. This is a similar concept to the express middleware for a request but for a response. Note that the middleware is executed in LIFO order. It is implemented by monkey patching (hooking) the res.end or res.json methods.

Getting started

$ npm install express-mung --save

Then in your middleware

var mung = require('express-mung');

module.exports = mung.json(my_transform);

Usage

Sample middleware (redact.js) to remove classified information.

'use strict';
const mung = require('express-mung');

/* Remove any classified information from the response. */
function redact(body, req, res) {
    // ...
    return body;
}

exports = mung.json(redact);

then add to your server.js file

app.use(require('redact.js'))

and That's all folks!

Reference

• mung.json(fn) transform the JSON body of the response. fn receives the JSON as an object, the req and res. It returns the modified body.

• mung.jsonAsync(fn) transform the JSON body of the response. fn receives the JSON as an object, the req and res. It returns a promise to a modified body.

License

The MIT license

Copyright © 2015 Richard Schneider ([e-mail])