Example Projects

LoopBack 4 comes with the following example projects.

Shopping example application showcasing LoopBack features

• loopback4-example-shopping: An online e-commerce demo to validate/test the LoopBack 4 framework readiness.

Examples for beginners

• hello-world: An example showing how to set up a simple application using LoopBack 4.

• todo: Tutorial example on how to build an application with LoopBack 4. See tutorial instructions.

• todo-list: Continuation of the todo example using relations in LoopBack 4. See tutorial instructions.

• soap-calculator: An example on how to integrate SOAP web services. See tutorial instructions.

Examples implementing/using extensions

• greeter-extension: An example showing how to implement the extension point/extension pattern.

• log-extension: An example showing how to write a complex log extension for LoopBack 4.

• metrics-prometheus: illustrate metrics provided by @loopback/metrics extension and Prometheus.

• graphql: An example that demonstrates GraphQL integration using @loopback/graphql.

• socketio: A basic implementation of Socket.IO using @loopback/socketio.

Examples with migration

• lb3-application: An example demonstrating how to mount your existing LoopBack 3 application on a new LoopBack 4 project.

• access-control-migration: An example demonstrating how to implement a Role Based Access Control (RBAC) system.

Authentication and authorization related examples

• passport-login: An example implementing authentication in a LoopBack application using Passport modules.

• todo-jwt: A modified Todo example with JWT authentication.

Other examples

• context: Standalone examples showing how to use @loopback/context as an Inversion of Control (IoC) and Dependency Injection (DI) container.

• file-transfer: An example showing how to expose APIs to upload and download files.

• greeting-app: An example showing how to compose an application from component and controllers, interceptors, and observers.

• multi-tenancy: An example application to demonstrate how to implement multi-tenancy with LoopBack 4.

• rpc-server: An example showing how to implement a made-up RPC protocol.

• rest-crud: An example showing how to use CrudRestComponent to define default repository and controller classes for a model without creating those classes.

• validation-app: An example demonstrating how to add validations in a LoopBack application.

• webpack: An example to bundle @loopback/core using webpack

How to download examples

You can download the example projects using our CLI tool lb4:

lb4 example <example-name>

For example, the following command downloads the hello-world example into loopback4-example-hello-world.

lb4 example hello-world

Please follow the instructions in Install LoopBack4 CLI if you don’t have lb4 installed yet.

The official examples are hosted at the following urls:

• https://github.com/loopbackio/loopback4-example-shopping
• https://github.com/loopbackio/loopback-next/tree/master/examples

Community examples

For examples created by the community, see the community examples page.