Which is better: MongoDB or PostgreSQL?

Both MongoDB or PostgreSQL have a strong case to make. MongoDB combines a document-based data model, flexible schema design, and built-in support for horizontal scaling. PostgreSQL combines a mature relational data model, powerful querying capabilities, and the reliability that has made it a popular choice for decades. Neither is inherently better than the other, which is why the decision isn’t straightforward, and why it's important to get it right from the beginning. Check our dedicated MongoDB vs. PostgreSQL guide to discover the key differences between the two databases and when to use each

MongoDB

Skill roadmap

Step by step guide to learning MongoDB in 2026

106 topics

Scaling MongoDB

Counting Documents

insert() and relevant

find() and relevant

update() and relevant

delete() and relevant

bulkWrite() and relevant

validate()

Useful concepts

Atlas Search Indexes

Aggregation

Read / Write Concerns

Query Operators

Cursors

Retryable Reads / Writes

Performance Optimization

MongoDB Basics

Role-based Access Control

X.509 Certificate Auth

Kerberos Authentication

LDAP Proxy Auth

MongoDB Audit

For ecosystem and more, check these other tracks involving GraphQL

Collections & Methods

Developer Tools

Replicasets

Sharded Clusters

Tuning Configuration

Indexing

Query Optimization

MongoDB Security

Pipelines, Stages and Operators

Transactions

SQL vs NoSQL

What is MongoDB?

When to use MongoDB?

What is MongoDB Atlas?

Data Model & Data Types

MongoDB Terminology

Related Roadmaps

Find the detailed version of this roadmap along with other similar roadmaps

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MongoDB

BSON vs JSON

Embedded Objects & Arrays

String

Double

Object

Array

Undefined

Binary Data

Boolean

Object ID

Null

Date

Regular Expression

Symbol

JavaScript

Int32/Int

Int64 / Long

Decimal128

Timestamp

Max Key

Min Key

Array Operators

Projection Operators

$project

$include

$in

$nin

$all

Creating Indexes

$exclude

$slice

$elemMatch

$size

Single Field

Compound

Comparison Operators

Element Operators

Text

Expiring

$eq

$gt

$lt

$exists

$type

Geospatial Indexes

$lte

$gte

$ne

$regex

$and

$or

$not

$nor

Logical Operators

Query Optimization

Common Operators

$match

$group

$sort

Language Drivers

$project

$skip

$limit

MongoDB Connectors

$unwind

$lookup

$sum

Kafka

Spark

Elastic Search

Backup & Recovery

mongodump

mongorestore

Encryption

Encryption at Rest

Queryable Encryption

Client-Side Field Level

TLS / SSL Encryption

Frontend Roadmap

Backend Roadmap

React Flow

Frequently asked questions

Related roadmaps

PostgreSQLrole Backendrole Node.jsskill Redisskill

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