Sift.js
Use Mongodb queries in JavaScript
Sift is a tiny library for using MongoDB queries in Javascript. Supported operators: $in, $nin, $exists, $gte, $gt, $lte, $lt, $eq, $ne, $mod, $all, $and, $or, $nor, $not, $size, $type, $regex, $where, $elemMatch. Creates a filter function without built-in MongoDB query operations. This is useful if you're looking to omit certain operations from application bundles.