18 interview questions on MongoDB for developers (2026)

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authentication

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relational database

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normalization

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full-text search

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Damienat Oct 23, 2023

18 interview questions on MongoDBfor developers (2026)

Test your technical skills before an interview of MongoDB with 18 corrected questions. Beginner, Intermediate or Expert level.

18 interview questions on MongoDBfor developers (2026)

Test your technical skills before an interview of MongoDB with 18 corrected questions. Beginner, Intermediate or Expert level.

How to change the default index of a MongoDB collection

How to prevent a MongoDB user from creating a collection with the same name as an existing collection?

MongoDB uses a document-based data model to store information.

Given a MongoDB connection URL, infer the authentication mechanism and the port number.

MongoDB allows incremental mapReduces to allow regular or on-demand data updates

Store the searches in a collection "searches" with a reference in the document "search"

Persisting an order for given availabilities is atomic, Listing the ids of landscapers who have already worked with a given client requires exactly 2 queries

Design a MongoDB schema to store the data of a list of landscapers and their services.

Design a MongoDB schema for a database of landscapers and the services they offer.

Get the list of customers linked to a given list of orders requires exactly 1 query

List all existing orders can be done on the clients collection or on the landscapers table

How to use the aggregate function in MongoDB

How to index embedded data in MongoDB

MongoDB is schemaless, indexes are generated automatically

What is one of the main differences between MongoDB and relational databases such as PostgreSQL regarding data model?

MongoDB uses a data storage architecture that is based on what fundamental concept?

MongoDB supports text search and the ability to perform full-text queries.

Explain the differences between a single index and a composite index in MongoDB.