Real time database NodeJs and Firebase restfull Api

database Firebase NodeJs API

By Code solution
Jan 20th, 2021
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Create server-side rest API using NodeJs and real-time database(Firebase).Npm Firebase package to create server-side rest API.

Project Structure :

Project Name                       // Project directory
   - node_modules                  // Npm Package
   -  package-lock.json.           // package-lock.json
   -  package.json                 // package.json
   -  server.js                    // server.js file
   -  index.html                   // Html file
   -  testapp.js                   // firebase json file

Create Project on Firebase console

Link: https://console.firebase.google.com/

then go to the project setting -> SERVICE ACCOUNTS

click then button Generate new private key

download the JSON file of your project

Then go to left side menu click Database and change the rules like that

{
  "rules": {
    ".read": true,
    ".write": true
  }
}

Then Create a new Directory, we can run the following command:

mkdir <directoryname>

Then move into the newly created directory:

cd <directoryname>

then run this command :

npm init

and fill this information like that :

package name: (directoryname)
version: (1.0.0)
description:
entry point: (index.js) server.js
test command:
git repository:
keywords:
author:
license: (ISC)
{"name": "curlapi",  "version": "1.0.0","description": "", "main": "server.js","scripts": { "test": "echo \"Error: no test specified\" && exit 1" },  "author": "",  "license": "ISC"}Is this ok? (yes) yes then enter

After creating project install node package run command:

npm install --save express morgan body-parser method-override multer, fs, firebase

create a server.js file and add this code :

// set up ========================

var express  = require('express');

var app      = express();                              // create our app w/ express

var Firebase = require('firebase');

var morgan = require('morgan');      

var bodyParser = require('body-parser');    // pull information from HTML POST (express4)

var methodOverride = require('method-override');

var multer  =   require('multer');

var fs = require("fs");

app.use(function(req, res, next) { //allow cross origin requests

    res.setHeader("Access-Control-Allow-Origin", "*");

    res.header("Access-Control-Allow-Methods", "POST, PUT, OPTIONS, DELETE, GET");

    res.header("Access-Control-Max-Age", "3600");

    res.header("Access-Control-Allow-Headers", "Content-Type, Access-Control-Allow-Headers, Authorization, X-Requested-With");

    next();

});

Firebase.initializeApp({

    databaseURL: "https://testapp-e5455.firebaseio.com/",

    serviceAccount: './testapp.json', //this is file that I downloaded from Firebase Console

});

var db = Firebase.database();

var usersRef = db.ref("users");

// var FirebaseRef = new Firebase("https://testapp-e5455.firebaseio.com/");

// configuration

app.use(express.static(__dirname + '/public'));                 // set the static files location /public/img will be /img for users

app.use('/public/uploads',express.static(__dirname + '/public/uploads'));

app.use(morgan('dev'));                                         // log every request to the console

app.use(bodyParser.urlencoded({'extended':'true'}));            // parse application/x-www-form-urlencoded

app.use(bodyParser.json());                                     // parse application/json

app.use(bodyParser.json({ type: 'application/vnd.api+json' })); // parse application/vnd.api+json as json

app.get('/', function (req, res) {

  res.sendfile('./index.html')

})

// create user

app.post('/api/createUser', function(req, res) {

   // var userEmail = req.body.user_email;

    var data = req.body;

usersRef.push(data, function(err) {

if (err) {

res.send(err)

} else {

// var key = Object.keys(snapshot.val())[0];

// console.log(key);

res.json({message: "Success: User Save.", result: true});

}

});

});

// update user

app.put('/api/updateUser', function(req, res) {

    var uid = "-Ks8HilZxX5vtFPqGu75";

var data = req.body;

usersRef.child(uid).update(data, function(err) {

if (err) {

res.send(err);

} else {

usersRef.child("uid").once("value", function(snapshot) {

if (snapshot.val() == null) {

res.json({message: "Error: No user found", "result": false});

} else {

res.json({"message":"successfully update data", "result": true, "data": snapshot.val()});

}

});

}

});

});

// delete user

app.delete('/api/removeUser', function(req, res) {

var uid = "-Ks8HilZxX5vtFPqGu75";

usersRef.child(uid).remove(function(err) {

if (err) {

res.send(err);

} else {

res.json({message: "Success: User deleted.", result: true});

}

})

});

// get users

app.post('/api/getUsers', function(req, res) {

    var uid = "-Ks8HilZxX5vtFPqGu75";

if (uid.length != 20) {

res.json({message: "Error: uid must be 20 characters long."});

} else {

usersRef.once("value", function(snapshot) {

//console.log(snapshot);

if (snapshot.val() == null) {

res.json({message: "Error: No user found", "result": false});

} else {

res.json({"message":"successfully fetch data", "result": true, "data": snapshot.val()});

}

});

}

});


// login

app.post('/api/login', function(req, res) {


    User.findOne({ 'user_name' :  req.body.user_name, 'password' : req.body.password }, function(err, user) {

            // if there are any errors, return the error

            if (err)

                return res.send(err);

            // check to see if user exist

            if (user) {

                return res.json(user);

            } else {

                return res.json({"message":"Invalid Username or Password."});

            }


        });

});

app.listen(3000);

console.log("port is 3000");

create Index.html file and add this code :

<!doctype html>
<html>
   <head>
      <title>Firebase</title>
      <link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0-beta/css/bootstrap.css">
   </head>
   <body>
      <h2>Firebase Hello</h2>
   </body>
</html>

Github Link: https://github.com/Sudarshan101/nodefirebaseApi

See Demo: https://www.youtube.com/watch?v=h-234ageRjs

About the author

Code solution

info@codesolution.co.in

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