How do I sort records in mongodb?

Try following:

db.getCollection('my-collection').find().sort({"created" : -1})

The basic syntax of sort() method is as follows:

db.COLLECTION_NAME.find().sort({KEY:1});

So, you can use following:

db.getCollection('my-collection').find({}).sort({"created" : -1})

Use following for Ascending order:

db.getCollection('my-collection').find({}).sort({"created" : 1})

For descending order:

db.getCollection('my-collection').find({}).sort({"created" : -1})