@upstash/qstash

Upstash qStash SDK

qStash is a serverless queueing / messaging system, designed to be used with serverless functions to consume from the queue.

It is the only connectionless (HTTP based) Redis client and designed for:

• Serverless functions (AWS Lambda ...)
• Cloudflare Workers (see the example)
• Fastly Compute@Edge (see the example)
• Next.js, Jamstack ...
• Client side web/mobile applications
• WebAssembly
• and other environments where HTTP is preferred over TCP.

See the list of APIs supported.

Status of the SDK

It is currently in beta and we are actively collecting feedback from the community. Please report any issues you encounter or feature requests in the GitHub issues or talk to us on Discord. Thank you!

How does qStash work?

qStash is the message broker between your serverless apps. You send aa HTTP request to qStash, that includes a destination, a payload and optional settings. We store your message durable and will deliver it to the destination API via HTTP. In case the destination is not ready to receive the message, we will retry the message later, to guarentee at-least-once delivery.

Quick Start

Install

npm

npm install @upstash/qstash

Deno

import { Redis } from "https://deno.land/x/upstash_qstash/mod.ts";

Get your authorization token

Go to upstash and copy the token.

Basic Usage:

Publishing a message

import { Client } from "@upstash/qstash";
/**
 * Import a fetch polyfill only if you are using node prior to v18.
 * This is not necessary for nextjs, deno or cloudflare workers.
 */
import "isomorphic-fetch";

const c = new Client({
  token: "<QSTASH_TOKEN>",
});

const res = await c.publishJSON({
  destination: "https://my-api...",
  body: {
    hello: "world",
  },
});
console.log(res);
// { messageId: "msg_xxxxxxxxxxxxxxxx" }

Receiving a message

How to consume a message depends on your http server. QStash does not receive the http request directly, but should be called by you as the first step in your handler function.

import { Receiver } from "@upstash/qstash";

const r = new Receiver({
  currentSigningKey: "..",
  nextSigningKey: "..",
});

const isValid = await r.verify({
  /**
   * The signature from the `Upstash-Signature` header.
   */
  signature: "string";

  /**
   * The raw request body.
   */
  body: "string";

  /**
   * URL of the endpoint where the request was sent to.
   */
  url: "string";
})

Docs

See the documentation for details.

Contributing

Install Deno