TypeORM is an ORM that can run in Node.js, Browser, Cordova, Ionic, React Native, NativeScript, Expo, and Electron platforms and can be used with TypeScript and JavaScript (ES2021). Its goal is to always support the latest JavaScript features and provide additional features that help you to develop any kind of application that uses databases - from small applications with a few tables to large-scale enterprise applications with multiple databases.

TypeORM supports more databases than any other JS/TS ORM: Google Spanner, Microsoft SqlServer, MySQL/MariaDB, MongoDB, Oracle, Postgres, SAP HANA and SQLite, as well we derived databases and different drivers.

TypeORM supports both Active Record and Data Mapper patterns, unlike all other JavaScript ORMs currently in existence, which means you can write high-quality, loosely coupled, scalable, maintainable applications in the most productive way.

TypeORM is highly influenced by other ORMs, such as Hibernate, Doctrine and Entity Framework.

Features

Supports both DataMapper and ActiveRecord (your choice).
Entities and columns.
Database-specific column types.
Entity manager.
Repositories and custom repositories.
Clean object-relational model.
Associations (relations).
Eager and lazy relations.
Unidirectional, bidirectional, and self-referenced relations.
Supports multiple inheritance patterns.
Cascades.
Indices.
Transactions.
Migrations and automatic migrations generation.
Connection pooling.
Replication.
Using multiple database instances.
Working with multiple database types.
Cross-database and cross-schema queries.
Elegant-syntax, flexible and powerful QueryBuilder.
Left and inner joins.
Proper pagination for queries using joins.
Query caching.
Streaming raw results.
Logging.
Listeners and subscribers (hooks).
Supports closure table pattern.
Schema declaration in models or separate configuration files.
Supports MySQL / MariaDB / Postgres / CockroachDB / SQLite / Microsoft SQL Server / Oracle / SAP Hana / sql.js.
Supports MongoDB NoSQL database.
Works in Node.js / Browser / Ionic / Cordova / React Native / NativeScript / Expo / Electron platforms.
TypeScript and JavaScript support.
ESM and CommonJS support.
Produced code is performant, flexible, clean, and maintainable.
Follows all possible best practices.
CLI.

And more...

With TypeORM, your models look like this:

import { Entity, PrimaryGeneratedColumn, Column } from "typeorm"

@Entity()
export class User {
    @PrimaryGeneratedColumn()
    id: number

    @Column()
    firstName: string

    @Column()
    lastName: string

    @Column()
    age: number
}

And your domain logic looks like this:

const userRepository = MyDataSource.getRepository(User)

const user = new User()
user.firstName = "Timber"
user.lastName = "Saw"
user.age = 25
await userRepository.save(user)

const allUsers = await userRepository.find()
const firstUser = await userRepository.findOneBy({
    id: 1,
}) // find by id
const timber = await userRepository.findOneBy({
    firstName: "Timber",
    lastName: "Saw",
}) // find by firstName and lastName

await userRepository.remove(timber)

Alternatively, if you prefer to use the ActiveRecord implementation, you can use it as well:

import { Entity, PrimaryGeneratedColumn, Column, BaseEntity } from "typeorm"

@Entity()
export class User extends BaseEntity {
    @PrimaryGeneratedColumn()
    id: number

    @Column()
    firstName: string

    @Column()
    lastName: string

    @Column()
    age: number
}

And your domain logic will look this way:

const user = new User()
user.firstName = "Timber"
user.lastName = "Saw"
user.age = 25
await user.save()

const allUsers = await User.find()
const firstUser = await User.findOneBy({
    id: 1,
})
const timber = await User.findOneBy({
    firstName: "Timber",
    lastName: "Saw",
})

await timber.remove()

Samples

Take a look at the samples in sample for examples of usage.

There are a few repositories that you can clone and start with:

Extensions

There are several extensions that simplify working with TypeORM and integrating it with other modules:

TypeORM integration with TypeDI
TypeORM integration with routing-controllers
Models generation from the existing database - typeorm-model-generator
Fixtures loader - typeorm-fixtures-cli
ER Diagram generator - typeorm-uml
another ER Diagram generator - erdia
Create, drop and seed database - typeorm-extension
Automatically update data-source.ts after generating migrations/entities - typeorm-codebase-sync
Easy manipulation of relations objects - typeorm-relations
Automatically generate relations based on a GraphQL query - typeorm-relations-graphql
Generate TypeORM entities from Valibot schemas - piying-orm

Contributing

Learn about contribution here and how to set up your development environment here.

This project exists thanks to all the people who contribute:

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