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Getting Started

Basic usage​

import { createHandler, Get } from 'next-api-decorators';

class UserHandler {
  @Get()
  public async users() {
    return await DB.findUsers();
  }
}

export default createHandler(UserHandler);
note

The example above is very simple. You can find more in depth usage here.

Motivation​

Building serverless functions declaratively with classes and decorators makes dealing with Next.js API routes easier and brings order and sanity to your /pages/api codebase.

The structure is heavily inspired by NestJS, which is an amazing framework for a lot of use cases. On the other hand, a separate NestJS repo for your backend can also bring unneeded overhead and complexity to projects with a smaller set of backend requirements. Combining the structure of NestJS, with the ease of use of Next.js, brings the best of both worlds for the right use case.

If you are not familiar with Next.js or NestJS and want some more information (or need to be convinced), check out the article Awesome Next.js API Routes with next-api-decorators by @tn12787

Installation​

npm install next-api-decorators

Using with SWC​

Your tsconfig.json needs the following flags in the compilerOptions section:

"experimentalDecorators": true,
"emitDecoratorMetadata": true

Using withBabel​

Since decorators are still in proposal state, you need to add the following plugins to your devDependencies in order to use them:

npm install --save-dev @babel/core babel-plugin-transform-typescript-metadata @babel/plugin-proposal-decorators babel-plugin-parameter-decorator

Make sure to add the following lines to the start of the plugins section in your babel configuration file:

{
  "plugins": [
    "babel-plugin-transform-typescript-metadata",
    ["@babel/plugin-proposal-decorators", { "legacy": true }],
    "babel-plugin-parameter-decorator",
    // ... other plugins
  ]
}

Your tsconfig.json needs the following flag in the compilerOptions section:

"experimentalDecorators": true

Examples​

Please see the examples to see how this library can be used.