mongodb nodejs - converting circular structure

Question

I have some code that pulls all documents from a collection and puts it onto a webpage. a simplified version looks like this:

var mongodb = require(\"mongodb         


        

Answer 1

Not sure what version of the API you are using, but i think that your syntax might be wrong looking at the API spec:

http://docs.mongodb.org/manual/reference/method/db.collection.find/

This is the declaration:

db.collection.find(<criteria>, <projection>)

And you are definitely misusing the projection parameter. Passing a callback like you are doing seems to return the db object in the result, which is causing the circular error during JSON serialization in express.

The correct code for the find all operation should be something like:

collection.find({}).toArray(function(error, documents) {
    if (err) throw error;

    res.send(documents);
});