greater than or equal to in mongodb code example

Example 1: mongodb greater than

db.yourDataBase.find({counter:{$gt:2}})

Example 2: mongodb less than

db.yourDatabaseName.find(counter:{$lt:100})

Example 3: mongodb greater than field value

collection.find( { $expr: { $gt: [ "$field1" , "$field2" ] } } )
#field1 greater than field2