@shgysk8zer0/netlify-func-utils

A collection of helpful functions for building Netlify Functions

[!IMPORTANT] This package relies on FormData and File support, which was added in Node 20 and will be available on Netlify and AWS Lambda sometime after it reaches LTS on or about 2023-10-24. In Node 18, FormData is supported, but uploads will be Blobs instead of Files.

Features

• Custom NetlifyRequest class extending Request
  • Created from a HandlerEvent event
  • Adds convenient searchParams property (URLSearchParams)
  • Adds cookies property as a Map from the Cookie header
• A createHandler function
  • Accepts an object of HTTP Methods and callbacks
  • Automatically handles errors
  • Callbacks are passed a NetlifyRequest object and must return a Response
  • Automatically adds CORS headers (can be disabled)

Example

import { createHandler } from '@shgysk8zer0/netlify-func-utils`;
import { BAD_REQUEST, NOT_AUTHORIZED } from '@shgysk8zer0/http/status';
import { HttpError } from '@shgysk8zer0/http/error';

export const handler  = createHandler({
  get: async req => {
    if (req.searchParams.has('id')) {
      return Response.json(await getItem(req.searchParams.get('id)));
    }
  },
  post: async req = {
    if (! req.cookies.has('token')) {
      throw new HTTPError('You must be signed-in.', { status: NOT_AUTHORIZED });
    } else {
      const data = await req.formData(); // `FormData`, including `File` objects
      
      if (! data.has('required-field')) {
        throw new HTTPError('Missing requied field.', { status: BAD_REQUEST });
      } else {
        // Maybe save something to a DB.
        return Response.json({ created: item.id });
      }
    }
  },
  delete: async req => {
    //
  },
}, {
  cors: true,
  headers: new Headers({ 'X-UID': crypto.randomUUID() }),
  allowHeaders: ['X-Foo', 'X-UID'],
}