How to remove a field from a collection in MongoDB

removeMongoField.js

// Params:
// 1. query (filter) if you only want to remove this field from some records. {} will select any.
// 2. $unset the field(s) that you want to remove. Here I've set them to null but the value doesn't matter as it's ignored.
// 3. multi must be set to true otherwise it will only operate on the first record that it finds.
// 
// Run this command in the MongoDB shell

db.<collectionName>.update( {}, {$unset: {<fieldName1>: null, <fieldName2>: null}}, {multi: true});