@bunlyfans/rest

Use Bun so you can REST. 😴

• 🐰 100% Bun
• ⚡️ 100% TypeScript
• 🪄 100% magic
• 🛫 0 dependencies
• 💩🚫 0 bullshit

Contribution appreciated! 🙏

If you have any ideas / thougts / feature requests or want to contribute - feel free to create an issue or pull request!

Usage

See example directory for more details.

bun add @bunlyfans/rest

Create folder directory:

- src/
  - routes/
    - users/
      - [id].routes.ts
  - index.ts

Add next content to index.ts:

import { Router, DebugMiddleware } from "@bundlyfans/rest";

const router = new Router({
  dir: "/routes/",
  debug: true, // to preview identified routes on app start/restart
});

router.register(new DebugMiddleware());

Bun.serve({
  fetch: router.handle,
  port: process.env.PORT || 3000,
});

Add next content to routes/users/[id].routes.ts:

import { JSON, Param } from "@bunlyfans/rest";

export const middlewares = [new MyCustomMiddleware()];

GET.middlewares = [new UserExistsMiddleware()];
// This function will handle `GET /users/[id]` request
export function GET(id: Param<number>) { 
  // ..
  return Response.json(user);
}

DELETE.middlewares = [new AllowFor([USER_ROLES.ADMIN])];
export async function DELETE(id: Param<number>, user: JSON<unknown>) {
  // ..
  return new Response('User deleted');
}

export async function POST(user: JSON<User>) {
  // ..
  return Response.json(user, { status: 201 });
}

Router

Main concept about router is that each entity is located in its own folder/file. Each folder can contain multiple files that will be used as endpoints. So File System path represents URL path.

Route handlers can be described only as Functions Declarations! So you can't use arrow functions or anonymous functions.

Usage of methods as names may be found as a bit weird, but it's done on purpose, so it will force you to split your routes according to REST principles.

If you want to create custom endpoint - create file /routes/users/[id]/reset-password.routes.ts and it will be available as /users/[id]/reset-password. Now create a handle with function in this file:

// Replace POST with GET, PUT, DELETE, etc. to use another method
export async function POST(id: Param<number>) { // Id will be automatically parsed
  // That is it! Just write your logic to reset password
}

Sometimes you may need index route, if folder for entity was already created and you do not want any params, then just use routes.ts filename. Note: In future such routes may become deprecated or renamed.

Supported argument sources

As you may noticed - arguments are parsed automatically by generic types. For now only fixed types are supported, but in future it will be possible to use custom types.

Type	Description
arg1 JSON<T>	Body of request. Will be parsed to JSON.
arg2 Param<T>	Parameter extracted from request. Will be parsed to specified type, but default - fallback to string. NOTE: arg2 is a name of the route param, so your path should look like /entity/[arg2].routes.ts or /entity/[arg2]/custom.routes.ts.
arg3 Query<T>	Argument will extract arg3 from request query.

If T is number, example Param<number> - it will be parsed as a number automatically.

If T is boolean, example Query<boolean> - it will be parsed as a number automatically.

Response

Just use Response.json(body) to return JSON object, or new Response('text'). See Bun documentation for more details.

Middleware

Create middleware by implementing PreMiddleware or PostMiddleware interface, or both.

export class DebugMiddleware implements PreMiddleware, PostMiddleware {
  preProcess(context: RequestContext): void | Promise<void> {
    // Context provides access to request, logger, matched route
  }

  postProcess(context: RequestContext, response: Response): void | Promise<void> | Response | Promise<Response> {
    // ...
    // You can modify or create new response, if nothing is returned - default response will be used
  }
}

Global

It will be applied to all routes in the app/router.

router.register(new DebugMiddleware());

Module

It will be applied to all methods in the router file from which it is exported.

export const middlewares = [new MyCustomMiddleware()];

Local

It will be applied to specific method in the router file.

DELETE.middlewares = [new AllowFor([USER_ROLES.ADMIN])];
export async function DELETE(id: Param<number>, user: JSON<unknown>) {