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https://github.com/neg4n/next-api-compose
🧬 Simple, dependency free, error aware and powerful utility to compose chain of multiple middleware into one Next.js API Route.
https://github.com/neg4n/next-api-compose
app-router-nextjs express hacktoberfest next next13 nextjs nextjs-api nextjs-api-routes nextjs-plugin nextjs-typescript pages-router typescript
Last synced: about 1 month ago
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🧬 Simple, dependency free, error aware and powerful utility to compose chain of multiple middleware into one Next.js API Route.
- Host: GitHub
- URL: https://github.com/neg4n/next-api-compose
- Owner: neg4n
- License: mit
- Created: 2021-09-14T00:27:09.000Z (about 3 years ago)
- Default Branch: development
- Last Pushed: 2023-12-02T15:42:05.000Z (about 1 year ago)
- Last Synced: 2024-10-03T12:38:21.489Z (2 months ago)
- Topics: app-router-nextjs, express, hacktoberfest, next, next13, nextjs, nextjs-api, nextjs-api-routes, nextjs-plugin, nextjs-typescript, pages-router, typescript
- Language: TypeScript
- Homepage: https://www.npmjs.com/package/next-api-compose
- Size: 884 KB
- Stars: 35
- Watchers: 1
- Forks: 4
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
- Awesome-NextJs - next-api-compose - `Simple, dependency free, error aware and powerful utility to compose chain of multiple middleware into one Next.js API Route.` (miscellaneous)
README
# Next.js API Compose · [](https://www.npmjs.com/package/next-api-compose) [](https://bundlephobia.com/package/next-api-compose)
## Introduction
This library provides a hassle-free way of composing multiple middleware functions into one [Next.js API Route Handler][next-api-route-handlers]'s method in the **[App Directory][next-app-router]** router.
> [!IMPORTANT]
> The `2.0.0` version of the library supports both [app][next-app-router] and [pages][next-app-router] directory oriented API utilities. If you're still using Pages Router and you want to migrate from versions below `2.0.0`, please read [migration guide](./.github/MIGRATE_V2.md) and ocassionally consider checking out [intro to the App Router][next-app-router-intro].
## Features
- [x] 😇 Simple and powerful API
- [x] 🚀 Designed both for Pages Router and App Router
- [x] 🧪 Production-ready. 100% test coverage, even type inference is tested!
- [x] 🥷 Excellent TypeScript support
- [x] 🧬 Maintaining order of middleware chain
- [x] 📦 No dependencies, small footprint
## Installing and basic usage
Install the package by running:
```sh
npm i next-api-compose -S
# or
yarn add next-api-compose
# or
pnpm i next-api-compose
```
then create an API Route Handler in the **[App Directory][next-app-router-intro]**:
in TypeScript **(recommended)**
```ts
import type { NextRequest } from "next/server";
import { compose } from "next-api-compose";
function someMiddleware(request: NextRequest & { foo: string }) {
request.foo = "bar";
}
const { GET } = compose({
GET: [
[someMiddleware],
(request /* This is automatically inferred */) => {
return new Response(request.foo);
// ^ (property) foo: string - autocomplete works here
},
],
});
export { GET };
```
in JavaScript:
```js
import { compose } from "next-api-compose";
function someMiddleware(request) {
request.foo = "bar";
}
const { GET } = compose({
GET: [
[someMiddleware],
(request) => {
return new Response(request.foo);
},
],
});
export { GET };
```
## Error handling
Handling errors both in middleware and in the main handler is as simple as providing `sharedErrorHandler` to the `compose` function's second parameter _(a.k.a compose settings)_. Main goal of the shared error handler is to provide clear and easy way to e.g. send the error metadata to Sentry or other error tracking service.
By default, shared error handler looks like this:
```ts
sharedErrorHandler: {
handler: undefined;
// ^^^^ This is the handler function. By default there is no handler, so the error is being just thrown.
includeRouteHandler: false;
// ^^^^^^^^^^^^^^^^ This toggles whether the route handler itself should be included in a error handled area.
// By default only middlewares are being caught by the sharedErrorHandler
}
```
... and some usage example:
```ts
// [...]
function errorMiddleware() {
throw new Error("foo");
}
const { GET } = compose(
{
GET: [
[errorMiddleware],
() => {
// Unreachable code due to errorMiddleware throwing an error and halting the chain
return new Response(JSON.stringify({ foo: "bar" }));
},
],
},
{
sharedErrorHandler: {
handler: (_method, error) => {
return new Response(JSON.stringify({ error: error.message }), {
status: 500,
});
},
},
}
);
// [...]
```
will return `{"error": "foo"}` along with `500` status code instead of throwing an error.
## Theory and caveats
1. Unfortunately there is no way to dynamically export named ESModules _(or at least I did not find a way)_ so you have to use `export { GET, POST }` syntax instead of something like `export compose(...)` if you're composing GET and POST methods :(
2. Middleware is executed as specified in the per-method array, so if you want to execute middleware in a specific order, you have to be careful about it. Early returned `new Response()` halts the middleware chain.
## Contributors
Igor
💻 ⚠️ 💡
Maksymilian Grabka
⚠️ 💻
kacper3123
📖
## License and acknowledgements
The project is licensed under The MIT License. Thanks for all the contributions! Feel free to open an issue or a pull request even if it is just a question 🙌
[next-api-route-handlers]: https://nextjs.org/docs/app/building-your-application/routing/route-handlers
[next-app-router-intro]: https://nextjs.org/docs/app/building-your-application/routing#the-app-router
[next-app-router]: https://nextjs.org/docs/app
[next-pages-router]: https://nextjs.org/docs/pages