Moleculer

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

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

$ 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.

Install moleculer-cli globally
```
$ npm install moleculer-cli -g
```
Create a new project (named first-demo)
```
$ moleculer init project first-demo
```
Press Y on API Gateway & npm install
Open project folder
```
$ cd first-demo
```
Start project
```
$ npm run dev
```
Open the http://localhost:3000/api/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!