# @loopback/core

> Define and implement core constructs such as Application and Component

Latest version **7.0.15** (published 2026-08-18) · MIT license · 0 weekly downloads

## Install

```sh
npm install @loopback/core
pnpm add @loopback/core
yarn add @loopback/core
bun add @loopback/core
```

## Health

**Score 65/100 (B)** — status: active.

Positive: has types; no vulnerabilities; recently updated; high maintenance score; high quality score.

Warnings: low downloads; no esm support.

## Facts

| | |
|---|---|
| Version | 7.0.15 |
| Published | 2026-08-18 |
| First published | 2017-05-03 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | bundled |
| Module format | CommonJS |
| Node | 20 \|\| 22 \|\| 24 |
| Dependencies | 3 |
| Unpacked size | 177.3 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| GitHub stars | 5106 |
| Author | IBM Corp. and LoopBack contributors |
| Maintainers | rfeng, rmg, dhmlau, theprez, frbuceta, marioestradarosa, achrinza |

## Links

- npm: https://www.npmjs.com/package/@loopback/core
- Repository: https://github.com/loopbackio/loopback-next
- Homepage: https://github.com/loopbackio/loopback-next#readme
- Issues: https://github.com/loopbackio/loopback-next/issues
- npm.io page: https://npm.io/package/@loopback/core

## Dependencies (3)

- [debug](https://npm.io/package/debug.md) ^4.4.3
- [tslib](https://npm.io/package/tslib.md) ^2.8.1
- [@loopback/context](https://npm.io/package/@loopback/context.md) ^8.0.15

## Recent versions

- 7.0.15 (latest) — 2026-08-18
- 0.11.0 (dp3) — 2018-07-20
- 0.6.0 (dp2) — 2018-04-16
- 4.0.0-alpha.23 (dp1) — 2017-11-29
- 7.0.14 — 2026-07-16
- 7.0.13 — 2026-06-11
- 7.0.12 — 2026-05-12
- 7.0.11 — 2026-04-14
- 7.0.10 — 2026-03-11
- 7.0.9 — 2026-02-10
- 7.0.8 — 2026-01-12
- 7.0.7 — 2025-12-09
- 7.0.6 — 2025-11-11
- 7.0.5 — 2025-10-15
- 7.0.4 — 2025-09-10
- … 209 more at https://npm.io/package/@loopback/core/versions

## README

# @loopback/core

LoopBack makes it easy to build modern applications that require complex
integrations.

## Overview

- Fast, small, powerful, extensible core
- Generate real APIs with a single command
- Define your data and endpoints with OpenAPI
- No maintenance of generated code

## Installation

```shell
$ npm install --save @loopback/core
```

## Basic Use

`@loopback/core` provides the foundation for your LoopBack app, but unlike
previous versions, it no longer contains the implementation for listening
servers.

For a typical example of how to create a REST server with your application, see
the
[@loopback/rest package.](https://github.com/loopbackio/loopback-next/tree/master/packages/rest)

## Advanced Use

Since `@loopback/core` is decoupled from the listening server implementation,
LoopBack applications are now able to work with any component that provides this
functionality.

```ts
// index.ts
import {Application} from '@loopback/core';
import {RestComponent} from '@loopback/rest';
import {GrpcComponent} from '@loopback/grpc';

const app = new Application({
  rest: {
    port: 3000,
  },
  grpc: {
    port: 3001,
  },
});
app.component(RestComponent); // REST Server
app.component(GrpcComponent)(
  // GRPC Server

  async function start() {
    // Let's retrieve the bound instances of our servers.
    const rest = await app.getServer<RestServer>('RestServer');
    const grpc = await app.getServer<GrpcServer>('GrpcServer');

    // Define all sorts of bindings here to pass configuration or data
    // between your server instances, define controllers and datasources for them,
    // etc...
    await app.start(); // This automatically spins up all your servers, too!
    console.log(`REST server running on port: ${rest.getSync('rest.port')}`);
    console.log(`GRPC server running on port: ${grpc.getSync('grpc.port')}`);
  },
)();
```

In the above example, having a GRPC server mounted on your Application could
enable communication with other GRPC-enabled microservices, allowing things like
dynamic configuration updates.

## Contributions

- [Guidelines](https://github.com/loopbackio/loopback-next/blob/master/docs/CONTRIBUTING.md)
- [Join the team](https://github.com/loopbackio/loopback-next/issues/110)

## Tests

Run `npm test` from the root folder.

## Contributors

See
[all contributors](https://github.com/loopbackio/loopback-next/graphs/contributors).

## License

MIT

---
_Source: https://npm.io/package/@loopback/core · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._