How to remove mongo specific fields from result (NodeJS, Mongoose)

Question

I want to remove all Mongo specific fields (like '_id') from query result. Is there a simple method to do this or should I remove fields manually? If yes, then which are that fields and how to do that?

I'm using NodeJS and Mongoose

Answer 1

You can use select() method for remove the field from your query:

Model.find({}).select("-removed_field").then (resp => {
// your code        
});

You should specified the "-" before field name, to be remove this field. If you want remove several fields - you can specified their as array:

Model.find({}).select(["-removed_field1", "-removed_field2" ... ]).then (resp => {
// your code        
});

Also you can to select only specified fields, using this method without "-"

Model.find({}).select(["field1", "field2" ... ]).then (resp => {
// your code        
});

Answer 2

If you want hide _id property you can use text argument with prefix - which will exclude this or that field from the result, for get sepecifict fields you should pass like this:

Entity.find({ ... }, 'field1 field2', function(err, entity) {
    console.log(entity);  // { field1: '...', field2: '...' }
});

Answer 3

You can specify a field to be excluded from results by using the optional 2nd parameter projection string of the find method:

Model.find({}, "-a -b").then (res => {
    // objects in the res array will all have the 
    // 'a' and 'b' fields excluded. 
});

https://mongoosejs.com/docs/api.html#model_Model.find (see projection)