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Lovepreet Singh
Lovepreet Singh

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Implementing Microservice Architecture In Node JS

๐Ÿ“ Introduction

๐Ÿ™‚ As we have discussed in our previous blog "Monolithic vs Microservices: A Practical Approach". But today we're going to implement Microservices Architecture in NodeJS.

๐Ÿ‘‰ You can use any technology like Spring, Python, etc. But we are going to demonstrate using NodeJS.

NodeJS Meme

๐Ÿ“ Directory Structure

๐Ÿ™‚ You can find the GitHub Repo (Kindly run npm install in Order, Payment, and API-Gateway directories before running) Here. We have two services Order and Payment with API Gateway.

NodeJS_Microservices
|
---> Order
|
------> server.js (Running on PORT 8081)
|
---> Payment
|
------> server.js (Running on PORT 8082)
|
---> API-Gateway
|
------> server.js (Running on Port 9091)

๐Ÿ”ฅ The structure of our services looks like this:-

๐Ÿ“ Implementation

Microservices Architecture

๐Ÿ™‚ Whenever a client makes a request to the API-Gateway, We have defined some routes (Using prefixes) that redirect the request to the appropriate service (Depends which route is called). Payment and Order services are independent means If one fails other will not be affected.

๐Ÿ”ฅ Also we can add Auth or Middlewares so that no one can call the services directly or without Authentication. We have implemented a very basic architecture.

  • Order Server.js
const express = require("express");
const app = express();

const port = 8081;
app.get("/order-list", (req,res)=>{
    let response = {
        data: {
            item: [
                {
                    id: 1,
                    name: 'order-1'
                },
                {
                    id: 2,
                    name: 'order-2'
                }
            ]
        }
    };
    res.status(200).json(response);
});
app.get("/", (req,res)=>{
    res.send("Order called");
});

app.listen(port, ()=>{
    console.log("Listening at localhost "+ port);    
})
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  • Payment server.js
const express = require("express");
const app = express();

const port = 8082;
app.get("/payment-list", (req,res)=>{
    let response = {
        data: {
            item: [
                {
                    id: 1,
                    name: 'Payment-1'
                },
                {
                    id: 2,
                    name: 'Payment-2'
                }
            ]
        }
    };
    res.status(200).json(response);
});

app.get("/", (req,res)=>{
    res.send("Payment called");
});

app.listen(port, ()=>{
    console.log("Listening at localhost "+ port);    
})
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  • API-Gateway
const gateway = require("fast-gateway");

const port = 9001;
const server = gateway({
    routes: [
        {
            prefix: "/order",
            target: "http://localhost:8081/",
            hooks: {}
        },
        {
            prefix: "/payment",
            target: "http://localhost:8082/",
            hooks: {}
        }
    ]
});

server.get('/mytesting', (req,res)=> {
    res.send("Gateway Called");
})

server.start(port).then(server=>{
    console.log("Gateway is running "+port);
})

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๐Ÿ˜Œ Now, we can start the services including the gateway

Terminal running microservices

๐Ÿ“ And we can request http://localhost:9001/order Or http://localhost:9001/payment


๐Ÿ™‹ Follow for more in-depth tutorials. Right now, I am targeting beginners but soon more advanced things we'll discuss.

Drop your views in the Comment Box. Hope It helps.

Top comments (58)

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itsnitinn profile image
Nitin Sharma

Crisp and nice.

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brense profile image
Rense Bakker

Nice! I used node-http-proxy in the past to create a gateway, didn't realize that fast-gateway existed, it looks very clean ๐Ÿ‘

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lovepreetsingh profile image
Lovepreet Singh

Thanks Rense. Highly appreciate ๐Ÿ˜Š

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adnanafzal565 profile image
Adnan Afzal

You are using prefix as "/order" so I think your order server.js will have:

app.get("/order"

And not:

app.get("/order-list"

Kindly correct me if I am wrong.

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lovepreetsingh profile image
Lovepreet Singh

You'll type localhost:9091/order and it will redirect you to the localhost:8081/

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pavanbelagatti profile image
Pavan Belagatti

When I call localhost:9091/order on my local, it I am getting 'page canโ€™t be found' error. Am I doing something wrong?

Thread Thread
 
lovepreetsingh profile image
Lovepreet Singh

Start all the services including order payment and gateway

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murilokaos profile image
Murilo Henrique

Eu creio que nรฃo, ele vai ter as rotas com o /order como prefixo, ou seja:

/order e /order/order-list

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shifi profile image
Shifa Ur Rehman

True

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snowowl profile image
Snow Owl

This is very crisp and well done.

If you don't want to spend a lot of time doing config, we at Snow Owl have enabled request-level routing, monitoring, and transformations for microservices without using Kubernetes. This is done by creating a reverse proxy + API gateway + rules engine.

It's also SaaS, no-code, serverless, and sits on the edge. , we set up in 15 minutes and scale easily. DM me if you want to beta test! Snowowl.co

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lovepreetsingh profile image
Lovepreet Singh

Ok.

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victorioberra profile image
Victorio Berra

When will your site have docs, screenshots and info?

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snowowl profile image
Snow Owl

You can check out docs.snowowl.co for docs, screenshots, and video. Also if you drop your email in the homepage I'll send you an email with beta login!

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vaibhav68849256 profile image
Vaibhav Khandare

Helpful

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akcgjc007 profile image
anupam

what is the difference between let and const? ๐Ÿค”

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rxavio profile image
Rxavio

const is a signal that the identifier won't be reassigned. let is a signal that the variable may be reassigned

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tlylt profile image
Liu Yongliang

Good demo! For simple routing/gateway it can also be done by setting up a reverse proxy with nginx.

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lovepreetsingh profile image
Lovepreet Singh

Already done in the previous blog

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muzzammil194 profile image
Muzzammil Shaikh

Nice content

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lovepreetsingh profile image
Lovepreet Singh

Thanks brother

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rescenic profile image
Muhammad Ridwan Hakim

Thank you. Please continue for in-depth tutorials.

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lovepreetsingh profile image
Lovepreet Singh

Sure. No problem. Kindly share the content with your friends๐Ÿ‘ญ๐Ÿ‘ฌ

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nadavl profile image
Nadav Lebovitch

Nice, very neat.
Usually in a monorepo it's helpful to have a packages manager such as Turborepo or NX to install all the packages and dependencies.

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lovepreetsingh profile image
Lovepreet Singh

Noted Nadav. Thanks for your view

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gulshanaggarwal profile image
Gulshan Aggarwal

Nice!

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lovepreetsingh profile image
Lovepreet Singh

Thanks Gulshan

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arielro85 profile image
arielro85

Easy to Understand. Thanks for this

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lovepreetsingh profile image
Lovepreet Singh

Thanks ๐Ÿ™‚

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maurer profile image
Daniel Maurer

Hello, what tool did you use to make the diagram?

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lovepreetsingh profile image
Lovepreet Singh

I did make it in GoodNotes app in ipad

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hartajsinghdev profile image
Hartaj-Singh-Dev

great

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restdbjones profile image
Jones - codehooks.io

Very good intro.
Any thoughts on covering also a serverless node.js approach?

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lovepreetsingh profile image
Lovepreet Singh

Will do that in the next one... Thanks

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