undeexcepturi/docs/versioned_docs/version-3.6/index.md

TypeScript ORM for Node.js based on Data Mapper, Unit of Work and Identity Map patterns. Supports MongoDB, MySQL, PostgreSQL and SQLite databases as well as usage with vanilla JavaScript.

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layout: homepage
title: MikroORM v3
hide_title: true
---

## Table of contents

- Overview
  - [Installation & Usage](./installation.md)
  - [Defining Entities](./defining-entities.md)
  - [Persisting, Cascading and Fetching Entities with `EntityManager`](./entity-manager.md)
  - [Using `EntityRepository` instead of `EntityManager`](./repositories.md)
- Fundamentals
  - [Identity Map and Request Context](./identity-map)
  - [Entity References and `Reference<T>` Wrapper](./entity-references.md)
  - [Using Entity Constructors](./entity-constructors.md)
  - [Modelling Relationships](./relationships.md)
  - [Collections](./collections.md)
  - [Unit of Work](./unit-of-work.md)
  - [Transactions](transactions.md)
  - [Cascading persist and remove](./cascading.md)
  - [Deployment](./deployment.md)
- Advanced Features
  - [Smart Nested Populate](./nested-populate.md)
  - [Smart Query Conditions](./query-conditions.md)
  - [Using `QueryBuilder`](./query-builder.md)
  - [Serializing](serializing.md)
  - [Updating Entity Values with `Entity.assign()`](./entity-helper.md)
  - [Property Validation](property-validation.md)
  - [Lifecycle Hooks](./lifecycle-hooks.md)
  - [Naming Strategy](./naming-strategy.md)
  - [Metadata Providers](./metadata-providers.md)
  - [Metadata Cache](./metadata-cache.md)
  - [Debugging](./debugging.md)
  - [Schema Generator](schema-generator.md)
  - [Entity Generator](./entity-generator.md)
  - [Migrations](./migrations.md)
  - [Read Replica Connections](./read-connections.md)
- Usage with Different Drivers
  - [Usage with SQL Drivers](./usage-with-sql.md)
  - [Usage with MongoDB](./usage-with-mongo.md)
- Recipes
  - [Usage with NestJS](./usage-with-nestjs.md)
  - [Usage with Vanilla JS](./usage-with-js.md)
  - [Creating Custom Driver](./custom-driver.md)
  - [Using Multiple Schemas](./multiple-schemas.md)
- Example Integrations
  - [Express + MongoDB + TypeScript](https://github.com/mikro-orm/mikro-orm-examples/tree/master/express-ts)
  - [Nest + MySQL + TypeScript](https://github.com/mikro-orm/mikro-orm-examples/tree/master/nest)
  - [RealWorld example app (Nest + MySQL)](https://github.com/mikro-orm/nestjs-realworld-example-app)
  - [Express + MongoDB + JavaScript](https://github.com/mikro-orm/mikro-orm-examples/tree/master/express-js)