Upstash QStash SDK

QStash is an HTTP based messaging and scheduling solution for serverless and edge runtimes.

It is 100% built on stateless HTTP requests and designed for:

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

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 an HTTP request to QStash, that includes a destination, a payload and optional settings. We durably store your message 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 { Client } 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({
  url: "https://my-api...",
  // or topic: "the name or id of a topic"
  body: {
    hello: "world",
  },
});
console.log(res);
// { messageId: "msg_xxxxxxxxxxxxxxxx" }

Receiving a message

How to receive a message depends on your http server. The Receiver.verify method 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";

  /**
   * Number of seconds to tolerate when checking `nbf` and `exp` claims, to deal with small clock differences among different servers
   *
   * @default 0
   */
  clockTolerance?: number;
})

Docs

See the documentation for details.

Contributing

Install Deno