Serving the Inngest API

Inngest works by serving an HTTP API endpoint which exposes your functions for us to call on-demand. The first thing you'll need to do is to add and serve the Inngest API in your project.

Setting up the API

Inngest provides a serve() handler which adds an API endpoint to your router. You should always serve our API at /api/inngest, as this makes automated deploys much easier. If you need to change the API URL skip to configuring the API Path.

// All serve handlers have the same arguments:
serve({
  client: inngest, // a client created with new Inngest()
  functions: [fnA, fnB], // an array of Inngest functions to serve, created with inngest.createFunction()
  /* Optional extra configuration */
});

We provide framework-specific bindings to make this easy for common platforms:

Each of these bindings wrap our base API which implemnts the core logic, so adding support for new frameworks is easy. Want us to add support for another platform? Come say hi in our discord or drop us a note.

Signing key

You'll need to assign your signing key to an INNGEST_SIGNING_KEY environment variable in your hosting provider or .env file locally. This lets the SDK securely communicate with Inngest. If you can't provide this as a signing key, you can pass it in to serve when setting up your framework. Read the reference for more information.

Framework: Astro
v3.8.0+

Add the following to ./src/pages/api/inngest.ts:

import { serve } from "inngest/astro";
import { functions, inngest } from "../../inngest";

export const { GET, POST, PUT } = serve({
  client: inngest,
  functions,
});

See the Astro example for more information.

Framework: AWS Lambda
v1.5.0+

We recommend using Lambda function URLs to trigger your functions, as these require no other configuration or cost.

Alternatively, you can use an API Gateway to route requests to your Lambda. The handler supports API Gateway V1 and API Gateway V2. If you are running API Gateway behind a proxy or have some other configuration, you may have to specify the serveHost and servePath options when calling serve() to ensure Inngest knows the URL where you are serving your functions. See Configuring the API path for more details.

import { serve } from "inngest/lambda";
import { inngest } from "./client";
import fnA from "./fnA"; // Your own function

export const handler = serve({
  client: inngest,
  functions: [fnA],
});

Bun.serve()

You can use the inngest/bun handler with Bun.serve() for a lightweight Inngest server.

import { serve } from "inngest/bun";
import { functions, inngest } from "./inngest";

Bun.serve({
  port: 3000,
  fetch(request: Request) {
    const url = new URL(request.url);

    if (url.pathname === "/api/inngest") {
      return serve({ client: inngest, functions })(request);
    }

    return new Response("Not found", { status: 404 });
  },
});

Framework: Cloudflare

You can import the Inngest API server when using Cloudflare pages functions or workers within /functions/api/inngest.js:

import { serve } from "inngest/cloudflare";
import { inngest } from "../../inngest/client";
import fnA from "../../inngest/fnA"; // Your own function

export const onRequest = serve({
  client: inngest,
  functions: [fnA],
});

Framework: DigitalOcean Functions

The DigitalOcean serve function allows you to deploy Inngest to DigitalOcean serverless functions. Because DigitalOcean doesn't provide the request URL in its function arguments, you must include the function URL and path when configuring your handler:

import { serve } from "inngest/digitalocean";
import { inngest } from "./src/inngest/client";
import fnA from "./src/inngest/fnA"; // Your own function

const main = serve({
  client: inngest,
  functions: [fnA],
  // Your digitalocean hostname.  This is required otherwise your functions won't work.
  serveHost: "https://faas-sfo3-your-url.doserverless.co",
  // And your DO path, also required.
  servePath: "/api/v1/web/fn-your-uuid/inngest",
});

// IMPORTANT: Makes the function available as a module in the project.
// This is required for any functions that require external dependencies.
module.exports.main = main;

Framework: Express

You can serve Inngest functions within your existing Express app, deployed to any hosting provider like render, fly, AWS, K8S, etc:

import { serve } from "inngest/express";
import { inngest } from "./src/inngest/client";
import fnA from "./src/inngest/fnA"; // Your own function

// Important:  ensure you add JSON middleware to process incoming JSON POST payloads.
app.use(express.json());
app.use(
  // Expose the middleware on our recommended path at `/api/inngest`.
  "/api/inngest",
  serve({ client: inngest, functions: [fnA] })
);

You must ensure you're using the express.json() middleware otherwise your functions won't be executed. Note - You may need to set express.json()'s limit option to something higher than the default 100kb to support larger event payloads and function state.

Framework: Fastify
v2.6.0+

You can serve Inngest functions within your existing Fastify app.

We recommend using the exported inngestFastify plugin, though we also expose a generic serve() function if you'd like to manually create a route.

import Fastify from "fastify";
import inngestFastify from "inngest/fastify";
import { inngest, fnA } from "./inngest";

const fastify = Fastify();

fastify.register(inngestFastify, {
  client: inngest,
  functions: [fnA],
  options: {},
});

fastify.listen({ port: 3000 }, function (err, address) {
  if (err) {
    fastify.log.error(err);
    process.exit(1);
  }
});

Framework: Fresh (Deno)

Inngest works with Deno's Fresh framework via the esm.sh CDN. Add the serve handler to ./api/inngest.ts as follows:

import { serve } from "https://esm.sh/inngest/deno/fresh";
import { inngest } from "./src/inngest/client.ts";
import fnA from "./src/inngest/fnA"; // Your own function

export const handler = serve({
  client: inngest,
  functions: [fnA],
});

Framework: Google Cloud Functions

Google's Functions Framework has an Express-compatible API which enables you to use the Express serve handler to deploy your functions to Google's Cloud Functions or Cloud Run. This is an example of a function

import * as ff from "@google-cloud/functions-framework";
import { serve } from "inngest/express";
import { inngest } from "./src/inngest/client";
import fnA from "./src/inngest/fnA"; // Your own function

ff.http(
  "inngest",
  serve({
    client: inngest,
    functions: [fnA],
  })
);

You can run this locally with npx @google-cloud/functions-framework --target=inngest which will serve your Inngest functions on port 8080.

Framework: H3
v2.7.0+

Inngest supports H3 and frameworks built upon it. Here's a simple H3 server that hosts serves an Inngest function.

index.js

import { createApp, eventHandler, toNodeListener } from "h3";
import { serve } from "inngest/h3";
import { createServer } from "node:http";
import { inngest } from "./inngest/client";
import fnA from "./inngest/fnA";

const app = createApp();
app.use(
  "/api/inngest",
  eventHandler(
    serve({
      client: inngest,
      functions: [fnA],
    })
  )
);

createServer(toNodeListener(app)).listen(process.env.PORT || 3000);

See the github.com/unjs/h3 repository for more information about how to host an H3 endpoint.

Framework: Koa
v3.6.0+

Add the following to your routing file:

import { serve } from "inngest/koa";
import Koa from "koa";
import bodyParser from "koa-bodyparser";
import { functions, inngest } from "./inngest";

const app = new Koa();
app.use(bodyParser()); // make sure we're parsing incoming JSON

const handler = serve({
  client: inngest,
  functions,
});

app.use((ctx) => {
  if (ctx.request.path === "/api/inngest") {
    return handler(ctx);
  }
});

See the Koa example for more information.

Framework: Next.js

Inngest has first class support for Next.js API routes, allowing you to easily create the Inngest API. Both the App Router and the Pages Router are supported. For the App Router, Inngest requires GET, POST, and PUT methods.

// src/app/api/inngest/route.ts
import { serve } from "inngest/next";
import { inngest } from "../../../inngest/client";
import fnA from "../../../inngest/fnA"; // Your own functions

export const { GET, POST, PUT } = serve({
  client: inngest,
  functions: [fnA],
});

Streaming
v1.8.0+

Next.js Edge Functions hosted on Vercel can also stream responses back to Inngest, giving you a much higher request timeout of 15 minutes (up from 10 seconds on the Vercel Hobby plan!).

To enable this, set your runtime to "edge" (see Quickstart for Using Edge Functions | Vercel Docs) and add the streaming: "allow" option to your serve handler:

Next.js 13+

export const runtime = "edge";

export default serve({
  client: inngest,
  functions: [...fns],
  streaming: "allow",
});
Older versions (Next.js 12)
export const config = {
  runtime: "edge",
};

const handler = serve({
  client: inngest,
  functions: [...fns],
  streaming: "allow",
});

For more information, check out the Streaming page.

Framework: Nuxt
v0.9.2+

Inngest has first class support for Nuxt server routes, allowing you to easily create the Inngest API. Add the following within ./server/api/inngest.ts:

import { serve } from "inngest/nuxt";
import { inngest } from "~~/inngest/client";
import fnA from "~~/inngest/fnA"; // Your own function

export default defineEventHandler(
  serve({
    client: inngest,
    functions: [fnA],
  })
);

Framework: Redwood

You can add Inngest to Redwood easily. Add the following to api/src/functions/inngest.ts:

import { serve } from "inngest/redwood";
import { inngest } from "src/inngest/client";
import fnA from "src/inngest/fnA"; // Your own function

export const handler = serve({
  client: inngest,
  functions: [fnA],
  servePath: "/api/inngest",
});

You should also update your redwood.toml to add apiUrl = "/api", ensuring your API is served at the /api root.

Framework: Remix

You can add Inngest to Remix easily. Add the following to ./app/routes/api.inngest.ts for Remix:

// app/routes/api.inngest.ts
import { serve } from "inngest/remix";
import { inngest } from "~/inngest/client";
import fnA from "~/inngest/fnA";

const handler = serve({
  client: inngest,
  functions: [fnA],
});

export { handler as action, handler as loader };

Streaming
v2.3.0+

Remix Edge Functions hosted on Vercel can also stream responses back to Inngest, giving you a much higher request timeout of 15 minutes (up from 10 seconds on the Vercel Hobby plan!).

To enable this, set your runtime to "edge" (see Quickstart for Using Edge Functions | Vercel Docs) and add the streaming: "allow" option to your serve handler:

export const config = {
  runtime: "edge",
};

const handler = serve({
  client: inngest,
  functions: [...fns],
  streaming: "allow",
});

For more information, check out the Streaming page.

Framework: SvelteKit
v3.5.0+

Add the following to ./src/routes/api/inngest/+server.ts:

import { functions, inngest } from '$lib/inngest';
import { serve } from 'inngest/sveltekit';

export const { GET, POST, PUT } = serve({ client: inngest, functions });

See the SvelteKit example for more information.

Reference

For more information about the serve handler, read the the reference guide, which includes: