mongoc

Mongoc lets you compile mongodb queries into Javascript functions that returns true if the query fits the input

It's available through npm:

npm install mongoc

It's easy to use

var mongoc = require('mongoc');
 
var query = mongoc({
    hello:'world',
    time:{
        $gt:10,
        $lt:20
    }
});
 
console.log(query({hello:world, time:14})) // prints true;

You can use the query to filter an array

var query = mongoc({
    hello:{$in:['world','mondo']}
});
 
console.log([{hello:'world'},{hello:'verden'},{hello:'mondo'},{hello:'welt'}].filter(query));

For a complete reference of the query language see the mongo docs