---
lang: en
title: 'API docs: index'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/strongloop/loopback-next
permalink: /doc/en/lb4/apidocs.index.html
---

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[Home](./index.md)

## API Reference

## Packages

|  Package | Description |
|  --- | --- |
|  [@loopback/apiconnect](./apiconnect.md) |  |
|  [@loopback/authentication](./authentication.md) | A LoopBack 4 component for authentication support. |
|  [@loopback/authentication-jwt](./authentication-jwt.md) |  |
|  [@loopback/authentication-passport](./authentication-passport.md) | An adapter to plug in passport based strategies to the authentication system in [@loopback/authentication @3.x](./authentication.md)<!-- -->. |
|  [@loopback/authorization](./authorization.md) | A LoopBack 4 component for authorization support (Role based, Permission based, Vote based) |
|  [@loopback/boot](./boot.md) | A convention based project Bootstrapper and Booters for LoopBack Applications. |
|  [@loopback/booter-lb3app](./booter-lb3app.md) |  |
|  [@loopback/context](./context.md) |  |
|  [@loopback/context-explorer](./context-explorer.md) |  |
|  [@loopback/core](./core.md) | The core foundation for LoopBack 4. It can also serve as the platform to build large-scale Node.js applications and frameworks. |
|  [@loopback/cron](./cron.md) |  |
|  [@loopback/express](./express.md) | The Express integration package for loopback-next. |
|  [@loopback/extension-health](./extension-health.md) | A component to report health status using [@cloudnative/health](https://github.com/CloudNativeJS/cloud-health)<!-- -->. |
|  [@loopback/extension-logging](./extension-logging.md) |  |
|  [@loopback/extension-metrics](./extension-metrics.md) | A component that reports metrics of Node.js, the LoopBack framework, and your application to Prometheus. |
|  [@loopback/http-caching-proxy](./http-caching-proxy.md) | A caching HTTP proxy for integration tests. |
|  [@loopback/http-server](./http-server.md) | HTTP / HTTPS server endpoints for LoopBack 4 apps. |
|  [@loopback/metadata](./metadata.md) | A package with utilities to help developers implement [TypeScript decorators](https://www.typescriptlang.org/docs/handbook/decorators.html)<!-- -->, define/merge metadata, and inspect metadata. |
|  [@loopback/model-api-builder](./model-api-builder.md) | A packge with types and helpers for packages contributing Model API builders. |
|  [@loopback/openapi-spec-builder](./openapi-spec-builder.md) | A package to simplify creating OpenAPI specification documents in your tests using the builder pattern. |
|  [@loopback/openapi-v3](./openapi-v3.md) | Decorators that describe LoopBack artifacts as OpenAPI 3.0.0 metadata and utilities that transfer LoopBack metadata to OpenAPI 3.0.0 specifications. |
|  [@loopback/repository](./repository.md) | A common set of interfaces for interacting with databases. |
|  [@loopback/repository-json-schema](./repository-json-schema.md) | Convert a TypeScript class/model to a JSON Schema for users, leveraging LoopBack4's decorators, metadata, and reflection system. |
|  [@loopback/repository-tests](./repository-tests.md) | A test suite verifying functionality of <code>@loopback/repository</code> in a connector -independent way. |
|  [@loopback/rest](./rest.md) | The REST API package for loopback-next. |
|  [@loopback/rest-crud](./rest-crud.md) | REST API controller implementing default CRUD semantics. |
|  [@loopback/rest-explorer](./rest-explorer.md) | A LoopBack 4 component for adding a self-hosted REST API Explorer. |
|  [@loopback/security](./security.md) | Common types/interfaces for LoopBack 4 security including authentication and authorization. |
|  [@loopback/service-proxy](./service-proxy.md) | A common set of interfaces for interacting with service oriented backends such as REST APIs, SOAP Web Services, and gRPC microservices. |
|  [@loopback/testlab](./testlab.md) | A collection of test utilities we use to write LoopBack tests. |
|  [@loopback/tsdocs](./tsdocs.md) | The <code>@loopback/tsdocs</code> package is an internal module to generate [tsdoc](https://github.com/Microsoft/tsdoc) based API docs for <code>@loopback/*</code> packages within [loopback-next](https://github.com/strongloop/loopback-next) monorepo managed by [Lerna](https://github.com/lerna/lerna)<!-- -->. |


