Faast.js dynamically transforms JavaScript modules into scalable serverless functions.

• Frictionless: Faast.js takes care of packaging your code, setting up IAM roles, and other infrastructure complexity. Run your code on a thousand cores in seconds. All you need is an AWS or GCP account.
• Scalable: Use serverless functions to scale your batch jobs up to thousands of cores.
• Cost-effective: Understand and optimize your workload costs in real time. Pay only for compute time actually used.
• Ephemeral: No clusters or services to manage. Faast.js creates the infrastructure it uses on the fly and cleans up when it's done.
• Developer optimized: First class support for TypeScript and JavaScript. Type safety, documentation, and extensive testing are part of our DNA.
• Portable: Built-in support for AWS Lambda and Google Cloud Functions, as well as local processing mode when you don't have network access. Switch with one line of code.

Installation

Faast.js requires node version 8+.

$ npm install faastjs

Example

Export your cloud functions in a module, and invoke faast.js on that module:

// functions.ts
export function hello(name: string) {
    return "hello " + name;
}

// main.ts
import { faast } from "faastjs";
import * as funcs from "./functions";

(async () => {
    const m = await faast("aws", funcs);
    const { hello } = m.functions;
    const result = await hello("world!");
    console.log(result);
    await m.cleanup();
})();

Make 1000 concurrent calls if you like:

const promises: string[] = [];
for (let i = 0; i < 1000; i++) {
    promises.push(hello(`world ${i}!`));
}
await Promise.all(promises);

Hold on! How much did that cost?

const cost = await m.costSnapshot();
console.log(cost);

Relax. It's just half a penny:

functionCallDuration  $0.00002813/second          102.0 seconds    $0.00286876    68.2%  [1]
sqs                   $0.00000040/request          1276 requests   $0.00051040    12.1%  [2]
sns                   $0.00000050/request          1000 requests   $0.00050000    11.9%  [3]
functionCallRequests  $0.00000020/request          1000 requests   $0.00020000     4.8%  [4]
outboundDataTransfer  $0.09000000/GB         0.00143808 GB         $0.00012943     3.1%  [5]
logIngestion          $0.50000000/GB                  0 GB         $0              0.0%  [6]
---------------------------------------------------------------------------------------
                                                                   $0.00420858 (USD)

It's that easy.

Ready to learn more?

Check out our website, documentation or detailed API.

Contributing

See contributing