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    :rocket: Progressive microservices framework for Node.js
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    Moleculer is a progressive microservices framework for Node.js. !-- ![](https://img.shields.io/badge/performance-%2B50%25-brightgreen.svg) ![](https://img.shields.io/badge/performance-%2B5%25-green.svg) ![](https://img.shields.io/badge/performance---10%25-yellow.svg) ![](https://img.shields.io/badge/performance---42%25-red.svg) --

    Website: https://moleculer.services

    Documentation: https://moleculer.services/docs

    What's included

    • Promise-based solution
    • request-reply concept
    • support streams
    • support event driven architecture with balancing
    • built-in service registry & dynamic service discovery
    • load balanced requests & events (round-robin, random, cpu-usage, latency)
    • many fault tolerance features (Circuit Breaker, Bulkhead, Retry, Timeout, Fallback)
    • supports middlewares
    • supports versioned services
    • service mixins
    • built-in caching solution (memory, Redis)
    • pluggable transporters (TCP, NATS, MQTT, Redis, NATS Streaming, Kafka)
    • pluggable serializers (JSON, Avro, MsgPack, Protocol Buffer, Thrift)
    • pluggable validator
    • multiple services on a node/server
    • all nodes are equal, no master/leader node
    • parameter validation with fastest-validator
    • built-in health monitoring & metrics
    • 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 and how to call it.

    const { ServiceBroker } = require("moleculer");
    
    // Create a broker
    let broker = new ServiceBroker({ logger: console });
    
    // Create a service
    broker.createService({
        name: "math",
        actions: {
            add(ctx) {
                return Number(ctx.params.a) + Number(ctx.params.b);
            }
        }
    });
    
    // Start broker
    broker.start()
        // Call service
        .then(() => broker.call("math.add", { a: 5, b: 3 }))
        .then(res => console.log("5 + 3 =", res))
        .catch(err => console.error(`Error occurred! ${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/ link in your browser. It shows a start page which contains two links to call the greeter service via API gateway.

    :tada: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

    @moleculerjs @MoleculerJS

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