Mongodb $where query always true with nodejs

Question

When I query my database with a function passed in the \"$where\" clause in nodejs, it always return me all documents in the db.

For example, if I do

Answer 1

This one is works for me , Just try to store a query as a string in one variable then concat your variable in query string,

var local_var = 42

var query = "{$where: function() { return this.a == "+local_var+"}}"

db.test.find(query)