Moleculer

Moleculer is a fast, modern and powerful microservices framework for Node.js (>= v6.x).

Website: https://moleculer.services

Documentation: https://moleculer.services/docs

What's included

• Promise-based solution
• request-reply concept
• support event driven architecture with balancing
• built-in service registry
• dynamic service discovery
• load balanced requests & events (round-robin, random, cpu-usage)
• supports middlewares
• service mixins
• multiple services on a node/server
• built-in caching solution (memory, Redis)
• pluggable transporters (TCP, NATS, MQTT, Redis, NATS Streaming, Kafka)
• pluggable serializers (JSON, Avro, MsgPack, Protocol Buffer)
• pluggable validator
• all nodes are equal, no master/leader node
• parameter validation with fastest-validator
• distributed timeout handling with fallback response
• health monitoring, metrics & statistics
• supports versioned services
• official API gateway module and many other modules...

Installation

$ npm install moleculer --save

or

$ yarn add moleculer

Create your first microservice

This example shows you how to create a small service with an add action which can add two numbers.

const { ServiceBroker } = require("moleculer");

let broker = new ServiceBroker({ logger: console });

broker.createService({
    name: "math",
    actions: {
        add(ctx) {
            return Number(ctx.params.a) + Number(ctx.params.b);
        }
    }
});

broker.start();

// Call service
broker.call("math.add", { a: 5, b: 3 })
    .then(res => console.log("5 + 3 =", res))
    .catch(err => console.error(`Error occured! ${err.message}`));

Try it on Runkit

Create a Moleculer project

Use the Moleculer CLI tool to create a new Moleculer based microservices project.

1. Install moleculer-cli globally

   $ npm install moleculer-cli -g

2. Create a new project (named first-demo)

   $ moleculer init project first-demo

   Press Y on API Gateway & npm install

3. Open project folder

   $ cd first-demo

4. Start project

   $ npm run dev

5. Open the http://localhost:3000/greeter/welcome?name=world link in your browser. It will call the welcome action of greeter service with a name param via API gateway and returns with the result.

🎉Congratulations! Your first Moleculer based microservices project is created. Read our documentation to learn more about Moleculer.

Official modules

We have many official modules for Moleculer. Check our list!

Supporting

Moleculer is an open source project. It is free to use for your personal or commercial projects. However, developing it takes up all my free time to make it better and better on a daily basis. If you like Moleculer framework, please support it.

Thank you very much!

Documentation

You can find here the documentation.

Changelog

See CHANGELOG.md.

Contributions

We welcome you to join to the development of Moleculer. Please read our contribution guide.

License

Moleculer is available under the MIT license.

3rd party licenses

Contact

Copyright (c) 2016-2018 MoleculerJS