JavaScript NoSQL Injection prevention in MongoDB

Question

How can I prevent JavaScript NoSQL injections into MongoDB?

I am working on a Node.js application and I am passing req.body, which is a json object, into the mongoose model's save function. I thought there were safeguards behind the scenes, but this doesn't appear to be the case.

Answer 1

Sushant's answer is not correct. You need to be aware of NoSQL injection in MongoDB.

Example (taken from here)

User.findOne({
    "name" : req.params.name, 
    "password" : req.params.password
}, callback); 

If req.params.password is { $ne: 1 }, the user will be retrieved without knowing the password ($ne means not equals 1).

MongoDB Driver

You can use mongo-sanitize:

It will strip out any keys that start with '$' in the input, so you can pass it to MongoDB without worrying about malicious users overwriting.

var sanitize = require('mongo-sanitize');

var name = sanitize(req.params.name);
var password = sanitize(req.params.password);

User.findOne({
    "name" : name, 
    "password" : password
}, callback); 

Mongoose Driver

As it follows a schema, if the password is a string field, it will convert the object { $ne: 1 } to string and no damage will be done. In this case, you don't need to sanitize, just remember to set a proper schema.