Express Mongoose Sanitize

Express 4.x middleware which sanitizes user-supplied data to prevent MongoDB Operator Injection.

Installation

npm install express-mongo-sanitize

Usage

Add as a piece of express middleware, before defining your routes.

var express = require('express'),
    bodyParser = require('body-parser'),
    mongoSanitize = require('express-mongo-sanitize');

var app = express();

app.use(bodyParser.urlencoded({extended: true}));
app.use(bodyParser.json());
app.use(mongoSanitize());

What?

This module removes any keys in objects that begin with a $ sign from req.body, req.query or req.params.

Why?

Object keys starting with a $ are reserved for use by MongoDB as operators. Without this sanitization, malicious users could send an object containing a $ operator, which could change the context of a database operation. Most notorious is the $where operator, which can execute arbitrary JavaScript on the database.

The best way to prevent this is to sanitize the received data, and remove any offending keys.

Credits

Inspired by mongo-sanitize.

License

MIT