Inngest Has a Free API — Event-Driven Functions Made Simple

#inngest #serverless #typescript #api

Inngest lets you build reliable event-driven functions without managing queues or infrastructure. Send events, Inngest runs your functions.

What Is Inngest?

Inngest is a durable execution engine. You define functions that react to events, and Inngest handles queuing, retries, concurrency, and rate limiting.

Free tier:

25,000 event runs/month
Unlimited functions
Dashboard and logs

Quick Start

npm install inngest
npx inngest-cli@latest dev

Define Functions

import { Inngest } from "inngest";

const inngest = new Inngest({ id: "my-app" });

// Function triggered by event
export const sendWelcomeEmail = inngest.createFunction(
  { id: "send-welcome-email" },
  { event: "user/created" },
  async ({ event, step }) => {
    // Step 1: Send email (auto-retried on failure)
    await step.run("send-email", async () => {
      await email.send({ to: event.data.email, template: "welcome" });
    });

    // Step 2: Wait 3 days
    await step.sleep("wait-3-days", "3d");

    // Step 3: Send follow-up
    await step.run("send-followup", async () => {
      await email.send({ to: event.data.email, template: "followup" });
    });
  }
);

Send Events

// From your API route
await inngest.send({ name: "user/created", data: { email: "user@example.com", name: "Alice" } });

// Or via REST
curl -X POST https://inn.gs/e/YOUR_KEY \
  -d '{"name":"user/created","data":{"email":"user@example.com"}}'