Adapters & Serverless

ExisJS was engineered from the ground up using modern web standards (Fetch API, Request/Response patterns). Because of this, ExisJS isn't just bound to Node.js—it can run virtually anywhere!

To deploy your ExisJS application to serverless or edge environments, you simply wrap your app with the corresponding adapter from exisjs/adapters.

AWS Lambda

Deploying an ExisJS API as an AWS Lambda function (behind API Gateway) takes one line of code.

import app from './http/server'import { serverlessAws } from 'exisjs/adapters'
// Export the AWS Lambda handlerexport const handler = serverlessAws(app)

Vercel

Vercel provides blazing fast serverless functions. To deploy an ExisJS app to Vercel, use the Vercel adapter inside api/index.ts.

import app from '../src/http/server'import { serverlessVercel } from 'exisjs/adapters'
// Export the Vercel handlerexport default serverlessVercel(app)

You'll also need a simple vercel.json to route all traffic to this function:

{  "rewrites": [    { "source": "/(.*)", "destination": "/api/index.ts" }  ]}

Edge Runtimes (Cloudflare, Deno, Bun)

Because ExisJS is highly optimized and avoids bulky Node.js-only legacy dependencies, it works flawlessly on Edge runtimes like Cloudflare Workers, Deno, and Bun!

Cloudflare Workers

import app from './http/server'import { serverlessCloudflare } from 'exisjs/adapters'
// Cloudflare expects an object with a fetch methodexport default {  fetch: serverlessCloudflare(app).fetch}

Bun

Bun provides a native, high-performance HTTP server. ExisJS provides a direct adapter to tie into Bun's serve function seamlessly.

import app from './http/server'import { serverlessBun } from 'exisjs/adapters'
export default {  port: 3000,  fetch: serverlessBun(app).fetch}

Deno

import app from './http/server'import { serverlessDeno } from 'exisjs/adapters'import { serve } from "https://deno.land/std@0.177.0/http/server.ts";
serve(serverlessDeno(app), { port: 8000 });

Netlify & Fastly

ExisJS also provides native adapters for netlify and fastly. The setup mirrors the examples above.

No matter where you choose to host your application, ExisJS handles the translation layer effortlessly, ensuring your code remains 100% portable and vendor-agnostic!