{"componentChunkName":"component---src-pages-author-author-yaml-id-js","path":"/author/ashish-sharma/","result":{"data":{"allMarkdownRemark":{"edges":[{"node":{"id":"5ae56a7b-ba96-5fd9-a1e4-be667a0ce526","html":"

Programming is an excellent exercise for your brain as programmers deal with never-ending situations like bugs, compiler, issues, deadlines, languages, etc. During all these times, other than the phenomenal codes, we produce MEMEs and a hell lot of MEMEs

\n

MEMEs can light the environment for every programmer in the world. On that note, there is a famous saying-

\n

“If debugging is the process of removing software bugs, then programming must be the process of putting them in – Edsger Dijkstra”

\n

Here is our developer picked list of 21 complied MEME for you:

\n

1. Always ready for new!!! - Kunal

\n

\n

2. Nothing Changes With Time - Tanvi Jain

\n

\n

3. Heaviest Object In The Universe - Nitesh Jain

\n

\n

4. Perception!! - Vikram Jain

\n

\n

5. Maths Always A hurdle !! - Mohammed Modi

\n

\n

6. I had a problem so I thought to use Java - Indrasen Kumar

\n

\n

7. Avoid Handshakes. - Piyush Kumar

\n

\n

8. I’m Really Unsure About My Own Creation - Kheenvraj Lomror

\n

\n

9. That Missing Fact - Priyadarshan Mohanty

\n

\n

10. Every IT Administrator. - Narendra Pareek

\n

\n

11. Imma Genius! - Abhimanyu Singh Rathore

\n

\n

12. My Logical Thinking as Programmer​​​. - Ankit Singh

\n

\n

13. HTML is a Programming Language - Hitesh Kumawat

\n

\n

14. Programmers while Sleeping​. - Versha Gupta

\n

\n

15. Programmer Swag!! - Gaurav Bewal

\n

\n

16. QA Life!! - Rakesh Pareek

\n

\n

17. Infinite... - Hridayesh Sharma

\n

\n

18. Python Lover!! - Aman Agrawal

\n

\n

19. What's your address? - Vijay Singh Shekhawat

\n

\n

20. Gamer and Programmer - Chinmaya Pati

\n

\n

If you have better ones, reply in the comments below and we’ll include them.

\n","frontmatter":{"title":"Let’s Take A MEME Break!!!","author":{"id":"Ashish Sharma","github":"ashish8947","avatar":null},"date":"September 04, 2020","updated_date":null,"tags":["MEME","Programming","Humor"],"coverImage":{"childImageSharp":{"fluid":{"aspectRatio":1.7241379310344827,"src":"/static/70f72136eb4f9f794700c1b2afd974c8/25338/cover.webp","srcSet":"/static/70f72136eb4f9f794700c1b2afd974c8/61e93/cover.webp 200w,\n/static/70f72136eb4f9f794700c1b2afd974c8/1f5c5/cover.webp 400w,\n/static/70f72136eb4f9f794700c1b2afd974c8/25338/cover.webp 550w","sizes":"(max-width: 550px) 100vw, 550px"}}}},"fields":{"authorId":"Ashish Sharma","slug":"/engineering/lets-take-meme-break/"}}},{"node":{"id":"1f3f868c-85de-556a-b0e6-50a8006931c6","html":"

In this post, we will look at the step-by-step process for Kafka Installation on Windows. Kafka is an open-source stream-processing software platform and comes under the Apache software foundation.

\n

What is Kafka?

\n

Kafka is used for real-time streams of data, to collect big data, or to do real-time analysis (or both). Kafka is used with in-memory microservices to provide durability and it can be used to feed events to complex event streaming systems and IoT/IFTTT-style automation systems.

\n

Installation :

\n

1. Java Setup:

\n

Kafka requires Java 8 for running. And hence, this is the first step that we should do to install Kafka. To install Java, there are a couple of options. We can go for the Oracle JDK version 8 from the Official Oracle Website.

\n

2. Kafka & Zookeeper Configuration:

\n

Step 1: Download Apache Kafka from its Official Site.

\n

Step 2: Extract tgz via cmd or from the available tool to a location of your choice:

\n
tar -xvzf kafka_2.12-2.4.1.tgz
\n

Step 3: Copy the path of the Kafka folder. Now go to config inside Kafka folder and open zookeeper.properties file. Copy the path against the field dataDir and add /zookeeper-data to the path.

\n

\nStep 4: we have to modify the config/server.properties file. Below is the change:

\n
fileslog.dirs=C:\\kafka\\kafka-logs
\n

Basically, we are pointing the log.dirs to the new folder /data/kafka.

\n

Run Kafka Server:

\n

Step 1: Kafka requires Zookeeper to run. Basically, Kafka uses Zookeeper to manage the entire cluster and various brokers. Therefore, a running instance of Zookeeper is a prerequisite to Kafka.

\n

To start Zookeeper, we can open a PowerShell prompt and execute the below command:

\n
.\\bin\\windows\\zookeeper-server-start.bat .\\config\\zookeeper.properties
\n

If the command is successful, Zookeeper will start on port 2181.

\n

Step 2: Now open another command prompt and change the directory to the kafka folder. Run kafka server using the command:

\n
.\\bin\\windows\\kafka-server-start.bat .\\config\\server.properties
\n

Now your Kafka Server is up and running, you can create topics to store messages. Also, we can produce or consume data directly from the command prompt.

\n

Create a Kafka Topic:

\n
    \n
  1. Open a new command prompt in the location C:\\kafka\\bin\\windows.
    2. \n
  2. Run the following command:
    3. \n
\n
kafka-topics.bat --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic test
\n

Creating Kafka Producer:

\n
    \n
  1. Open a new command prompt in the location C:\\kafka\\bin\\windows
    2. \n
  2. Run the following command:
    3. \n
\n
kafka-console-producer.bat --broker-list localhost:9092 --topic test
\n

Creating Kafka Consumer:

\n
    \n
  1. Open a new command prompt in the location C:\\kafka\\bin\\windows.
    2. \n
  2. Run the following command:
    3. \n
\n
kafka-console-consumer.bat --bootstrap-server localhost:9092 --topic test --from-beginning
\n

If you see these messages on consumer console,Congratulations!!! you all done. Then you can play with producer and consumer terminal bypassing some Kafka messages.

\n","frontmatter":{"title":"Setting Up and Running Apache Kafka on Windows OS","author":{"id":"Ashish Sharma","github":"ashish8947","avatar":null},"date":"August 25, 2020","updated_date":null,"tags":["Kafka","Windows"],"coverImage":{"childImageSharp":{"fluid":{"aspectRatio":1.5037593984962405,"src":"/static/41484554ead7eb70ade1abe9498282b0/58556/messagelog.webp","srcSet":"/static/41484554ead7eb70ade1abe9498282b0/61e93/messagelog.webp 200w,\n/static/41484554ead7eb70ade1abe9498282b0/1f5c5/messagelog.webp 400w,\n/static/41484554ead7eb70ade1abe9498282b0/58556/messagelog.webp 800w,\n/static/41484554ead7eb70ade1abe9498282b0/99238/messagelog.webp 1200w,\n/static/41484554ead7eb70ade1abe9498282b0/7c22d/messagelog.webp 1600w,\n/static/41484554ead7eb70ade1abe9498282b0/a9f42/messagelog.webp 2700w","sizes":"(max-width: 800px) 100vw, 800px"}}}},"fields":{"authorId":"Ashish Sharma","slug":"/engineering/quick-kafka-installation/"}}},{"node":{"id":"a36f7982-5ef2-5520-928f-cbb37723e31a","html":"

In this blog, we’ll be implementing authentication with password hashing in a Node.js web application. For this, we’ll be using crypto, a package password hashing for Node.js.

\n

The Crypto module for Node JS helps developers to hash user passwords.

\n

Pre-requisites:

\n\n

Step 1. First, create a directory structure as below :

\n

hashApp

\n
--model\n----user.js\n--route\n----user.js\n--server.js
\n

Step 2. Create model/user.js file and add the following code :

\n
// Importing modules \nconst mongoose = require('mongoose'); \nvar crypto = require('crypto'); \n  \n// Creating user schema \nconst UserSchema = mongoose.Schema({ \n    name : { \n        type : String, \n        required : true\n    }, \n    email : { \n        type : String, \n        required : true\n    }, \n    hash : String, \n    salt : String \n}); \n  \n// Method to set salt and hash the password for a user \nUserSchema.methods.setPassword = function(password) { \n     \n // Creating a unique salt for a particular user \n    this.salt = crypto.randomBytes(16).toString('hex'); \n  \n    // Hashing user's salt and password with 1000 iterations, \n     \n    this.hash = crypto.pbkdf2Sync(password, this.salt,  \n    1000, 64, `sha512`).toString(`hex`); \n}; \n  \n// Method to check the entered password is correct or not \nUserSchema.methods.validPassword = function(password) { \n    var hash = crypto.pbkdf2Sync(password,  \n    this.salt, 1000, 64, `sha512`).toString(`hex`); \n    return this.hash === hash; \n}; \n  \n// Exporting module to allow it to be imported in other files \nconst User = module.exports = mongoose.model('User', UserSchema);
\n

Step 3. Create route/user.js file and add the following code:

\n
// Importing modules \nconst express = require('express'); \nconst router = express.Router(); \n\n// Importing User Schema \nconst User = require('../model/user'); \n\n// User login api \nrouter.post('/login', (req, res) => { \n\n    // Find user with requested email \n    User.findOne({ email : req.body.email }, function(err, user) { \n        if (user === null) { \n            return res.status(400).send({ \n                message : "User not found."\n            }); \n        } \n        else { \n            if (user.validPassword(req.body.password)) { \n                return res.status(201).send({ \n                    message : "User Logged In", \n                }) \n            } \n            else { \n                return res.status(400).send({ \n                    message : "Wrong Password"\n                }); \n            } \n        } \n    }); \n}); \n\n// User signup api \nrouter.post('/signup', (req, res, next) => { \n\n\n// Creating empty user object \n    let newUser = new User(); \n\n    // Initialize newUser object with request data \n    newUser.name = req.body.name, \n\n    newUser.email = req.body.email,\n\n\n    newUser.password=req.body.password\n\n                    // Call setPassword function to hash password \n                    newUser.setPassword(req.body.password); \n\n    // Save newUser object to database \n    newUser.save((err, User) => { \n        if (err) { \n            return res.status(400).send({ \n                message : "Failed to add user."\n            }); \n        } \n        else { \n            return res.status(201).send({ \n                message : "User added successfully."\n            }); \n        } \n    }); \n}); \n// Export module to allow it to be imported in other files \nmodule.exports = router;
\n

Step 4. Create server.js file :

\n
// Importing modules\nvar express = require('express');\nvar mongoose = require('mongoose');\nvar bodyparser = require('body-parser');\n  \n// Initialize express app\nvar app = express();\n  \n// Mongodb connection url\nvar MONGODB_URI = "mongodb://localhost:27017/hashAppDb";\n  \n// Connect to MongoDB\nmongoose.connect(MONGODB_URI);\nmongoose.connection.on('connected', () => {\n    console.log('Connected to MongoDB @ 27017');\n});\n  \n// Using bodyparser to parse json data\napp.use(bodyparser.json());\n  \n// Importing routes\nconst user = require('./route/user');\n  \n// Use user route when url matches /api/user/\napp.use('/api/user', user);\n  \n// Creating server\nconst port = 3000;\napp.listen(port, () => {\n    console.log("Server ru\nnning at port: " + port);\n});
\n

Step 5. Run server.js file using command

\n
node server.js
\n

Step 6. Open Postman and create a post request to localhost:3000/api/user/signup with following body parameter:

\n
{\n"name" : "test".\n"email" : "test@test.com",\n"password" : "test1234"\n}
\n

Run the request and you will get a success response:

\n
{\n"message" : "user added sucessfully"\n}
\n

User data is stored in the database as below:

\n
    "_id": {\n        "$oid": "5ab71ef2afb6db0148052f6f"\n    },\n    "name": "test",\n    "email": "test@test.com",\n    "salt": "ddee18ef6a6804fbb919b25f790005e3",\n    "hash": "bbf13ae4db87d475ca0ee5f97e397248a23509fc10c82f1e3cf110\n     b352c3ca6cc057955ace9d541573929cd7a74a280a02e8cb549136b43df7704caaa555b38a",\n    "__v": 0\n}
\n

If we have sensitive data or information that you need to be protected, ensuring it is secured correctly is important. With the above process, we can now successfully store our hashed password into our database with a bit of additional security.

\n

You can check the code on Github.

\n","frontmatter":{"title":"Password hashing with NodeJS","author":{"id":"Ashish Sharma","github":"ashish8947","avatar":null},"date":"June 25, 2020","updated_date":null,"tags":["Security","NodeJs"],"coverImage":{"childImageSharp":{"fluid":{"aspectRatio":1.4598540145985401,"src":"/static/7c5686f355f37377e26ec91cbaa6cbed/58556/cover.webp","srcSet":"/static/7c5686f355f37377e26ec91cbaa6cbed/61e93/cover.webp 200w,\n/static/7c5686f355f37377e26ec91cbaa6cbed/1f5c5/cover.webp 400w,\n/static/7c5686f355f37377e26ec91cbaa6cbed/58556/cover.webp 800w,\n/static/7c5686f355f37377e26ec91cbaa6cbed/99238/cover.webp 1200w,\n/static/7c5686f355f37377e26ec91cbaa6cbed/ba24a/cover.webp 1440w","sizes":"(max-width: 800px) 100vw, 800px"}}}},"fields":{"authorId":"Ashish Sharma","slug":"/engineering/password-hashing-with-nodejs/"}}},{"node":{"id":"923718a7-f452-576f-8e0a-31c6c8d17beb","html":"

In this blog, we’ll be implementing authentication via Twitter in a Golang web application. For this, we’ll be using Goth, a social authentication middleware for Golang.

\n

Pre-requisites:

\n\n

Firstly, We need to create a new Twitter App using its Application Management. Twitter does not seem to work nicely with it if \"localhost\" is given in the callback URL field. To overcome this limitation, you could use the special loopback address or \"127.0.0.1\" in place of \"localhost\".

\n

Step 1. First, create a directory structure as below for your Go Application :

\n
TwitterAuthenticationGoth\n-templates\n--index.html\n--success.html\n-main.go
\n

Step 2. Add the following code in index.html for creating LoginUI:

\n
<!doctype html>\n<html>\n<head>\n    <title>Twitter SignIn</title>\n    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css"> <!-- load bulma css -->\n    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css"> <!-- load fontawesome -->\n    <style>\n        body        { padding-top:70px; }\n    </style>\n</head>\n<body>\n<div class="container">\n    <div class="jumbotron text-center text-success">\n        <h1><span class="fa fa-lock"></span> Social Authentication</h1>\n        <p>Login or Register with:</p>\n        <a href="/auth/twitter" class="btn btn-danger"><span class="fa fa-twitter"></span> SignIn with Twitter</a>\n    </div>\n</div>\n</body>\n</html>
\n

Step 3 Add the following code in success.html for creating ProfileUI:

\n
<!doctype html>\n<html>\n  <head>\n    <title>Twitter SignIn</title>\n    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css"> <!-- load bulma css -->\n    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css"> <!-- load fontawesome -->\n      <style>\n          body        { padding-top:70px; }\n      </style>\n  </head>\n  <body>\n    <div class="container">\n      <div class="jumbotron">\n          <h1 class="text-success  text-center"><span class="fa fa-user"></span> Profile Information</h1>\n          <div class="row">\n            <div class="col-sm-6">\n                <div class="well">\n                        <p>\n                            <strong>Id</strong>: {{.UserID}}<br>\n                            <strong>Email</strong>: {{.Email}}<br>\n                            <strong>Name</strong>: {{.Name}}\n                        </p>\n                </div>\n            </div>\n        </div>\n      </div>\n    </div>\n  </body>\n</html>
\n

Step 4. Add the following code in main.go for importing Goth and other packages :

\n
import (\n    "fmt"\n    "html/template"\n    "log"\n    "net/http"\n    "sort"\n\n    "github.com/gorilla/pat"\n    "github.com/markbates/goth"\n    "github.com/markbates/goth/gothic"\n    "github.com/markbates/goth/providers/twitter"\n)
\n

Now we are ready to implement Twitter Authentication in our app

\n

Step 5. Setup the twitter configuration by adding the following code in main.go :

\n
goth.UseProviders(\n        twitter.New("TWITTER_KEY", "TWITTER_SECRET", "http://127.0.0.1:3000/auth/twitter/callback"),\n\n    )
\n

Step 6. For adding all routes and functionality you just need to add following code in main.go :

\n
 type ProviderIndex struct {\n     Providers[] string\n     ProvidersMap map[string] string\n }\n\n func main() {\n     goth.UseProviders(\n         twitter.New("TWITTER_KEY", "TWITTER_SECRET", "http://127.0.0.1:3000/auth/twitter/callback"),\n         // If you'd like to use authenticate instead of authorize in Twitter provider, use this instead.\n         // twitter.NewAuthenticate(os.Getenv("TWITTER_KEY"), os.Getenv("TWITTER_SECRET"), "http://localhost:3000/auth/twitter/callback"),\n     )\n\n     m: = make(map[string] string)\n     m["twitter"] = "Twitter"\n\n     var keys[] string\n     for k: = range m {\n         keys = append(keys, k)\n     }\n     sort.Strings(keys)\n\n     providerIndex: = & ProviderIndex {\n         Providers: keys,\n         ProvidersMap: m\n     }\n\n     p: = pat.New()\n     p.Get("/auth/{provider}/callback", func(res http.ResponseWriter, req * http.Request) {\n\n         user, err: = gothic.CompleteUserAuth(res, req)\n         if err != nil {\n             fmt.Fprintln(res, err)\n             return\n         }\n         t, _: = template.ParseFiles("templates/success.html")\n         t.Execute(res, user)\n     })\n\n     p.Get("/logout/{provider}", func(res http.ResponseWriter, req * http.Request) {\n         gothic.Logout(res, req)\n         res.Header().Set("Location", "/")\n         res.WriteHeader(http.StatusTemporaryRedirect)\n     })\n\n     p.Get("/auth/{provider}", func(res http.ResponseWriter, req * http.Request) {\n         // try to get the user without re-authenticating\n         if gothUser, err: = gothic.CompleteUserAuth(res, req);\n         err == nil {\n             t, _: = template.ParseFiles("templates/success.html")\n             t.Execute(res, gothUser)\n         } else {\n             gothic.BeginAuthHandler(res, req)\n         }\n     })\n\n     p.Get("/", func(res http.ResponseWriter, req * http.Request) {\n         t, _: = template.ParseFiles("templates/index.html")\n         t.Execute(res, providerIndex)\n     })\n     log.Println("listening on localhost:3000")\n     log.Fatal(http.ListenAndServe(":3000", p))\n }
\n

Now you just need to run the project by using the following command and try logging by using the Twitter button.

\n

Step 7. Run the project :

\n
 go run main.go
\n

Step 8. Visit the browser with the URL http://127.0.0.1:3000.

\n

\"Login\"

\n

We need to click on Authorize button, which will redirect us to google login page

\n

\"Auth\"

\n

After login with our twitter credentials, it will redirect back to our application and on the success page, we can see the details of the logged-in user and can save this detail in the database for future use also.

\n

\"Profile\"

\n

As we have seen it is fairly easy to build a twitter social authentication system with Go and Goth, You can found the complete code used in this tutorial on our Github Repo

\n","frontmatter":{"title":"Twitter authentication with Go Language and Goth","author":{"id":"Ashish Sharma","github":"ashish8947","avatar":null},"date":"June 15, 2020","updated_date":null,"tags":["Go","SocialLogin","Oauth"],"coverImage":{"childImageSharp":{"fluid":{"aspectRatio":1.7699115044247788,"src":"/static/4f79bafe25a85ffc0b8e8cee3a3e44c8/58556/cover.webp","srcSet":"/static/4f79bafe25a85ffc0b8e8cee3a3e44c8/61e93/cover.webp 200w,\n/static/4f79bafe25a85ffc0b8e8cee3a3e44c8/1f5c5/cover.webp 400w,\n/static/4f79bafe25a85ffc0b8e8cee3a3e44c8/58556/cover.webp 800w,\n/static/4f79bafe25a85ffc0b8e8cee3a3e44c8/99238/cover.webp 1200w,\n/static/4f79bafe25a85ffc0b8e8cee3a3e44c8/7c22d/cover.webp 1600w","sizes":"(max-width: 800px) 100vw, 800px"}}}},"fields":{"authorId":"Ashish Sharma","slug":"/engineering/twitter-authentication-with-golang-and-goth/"}}},{"node":{"id":"da3b08e6-4fe0-5300-9bed-84454de297ef","html":"

Hello, Deno

\n

Deno is a new platform for writing applications using JavaScript and TypeScript. It is based on the V8 JavaScript engine and the Rust.

\n

Deno’s lowest level binding layer to the system is tied to promises (called ops). Deno is secure by default, provides first-class TypeScript support, has built-in utilities like a dependency inspector, and supports third-party modules such as lodash .

\n

Btw, this is the best damn geeky one-liner code to explain what is Deno. Totally cool.

\n

\"alt_text\"

\n

Installation

\n

Deno works on macOS, Linux, and Windows. Deno is a single binary executable and it has no external dependencies.

\n

See all installation.

\n

Install Deno on Windows 10/8/7

\n

Launch Windows PowerShell and run the following command to install Deno on Windows 10/8/7

\n
iwr https://deno.land/x/install/install.ps1 -useb | iex
\n

Install Deno on Linux and macOS

\n

Launch terminal and run the following command to install Deno on Linux and Mac

\n
curl -fsSL https://deno.land/x/install/install.sh | sh
\n

Open a new terminal and run deno. You should get a > prompt. Type exit.

\n

After installing deno on your system we just need to create a simple Hello World program by using the following steps :

\n

Step 1. Create a Folder as per your project name by using command prompt

\n
mkdir HelloWorldDeno
\n

Step 2. Create a typeScript file and name it index.ts.

\n

Step 3. Add the following code in index.ts.

\n
const helloWorld = (name: string = "world") => {\n  console.log(`Hello ${name}!!`);\n}\n\nhelloWorld();\n\nhelloWorld("Friend");
\n

Step 4. Run the following project by using the following command

\n
deno run index.ts
\n

You can check the result here

\n

\"alt_text\"

\n

Yupppp it works this is your first Deno program !!

\n","frontmatter":{"title":"Hello world with Deno","author":{"id":"Ashish Sharma","github":"ashish8947","avatar":null},"date":"June 02, 2020","updated_date":null,"tags":["Deno","HelloWorld","NodeJs"],"coverImage":{"childImageSharp":{"fluid":{"aspectRatio":1.7699115044247788,"src":"/static/70351d960fd94ea6641dc19419a97bbc/58556/deno.webp","srcSet":"/static/70351d960fd94ea6641dc19419a97bbc/61e93/deno.webp 200w,\n/static/70351d960fd94ea6641dc19419a97bbc/1f5c5/deno.webp 400w,\n/static/70351d960fd94ea6641dc19419a97bbc/58556/deno.webp 800w,\n/static/70351d960fd94ea6641dc19419a97bbc/99238/deno.webp 1200w,\n/static/70351d960fd94ea6641dc19419a97bbc/135cd/deno.webp 1280w","sizes":"(max-width: 800px) 100vw, 800px"}}}},"fields":{"authorId":"Ashish Sharma","slug":"/engineering/hello-world-deno/"}}},{"node":{"id":"30bc4404-9225-5434-9fe8-34366bb6a88b","html":"

In this blog, we’ll be implementing authentication with JWT in a NodeJS web application. For this, we’ll be using jsonwebtoken package

\n

What is JWT?

\n

JWT(JSON Web Token) is a token format. It is digitally-signed, self-contained, and compact. It provides a convenient mechanism for transferring data. JWT is not inherently secure, but the use of JWT can ensure the authenticity of the message so long as the signature is verified and the integrity of the payload can be guaranteed. JWT is often used for stateless authentication in simple use cases involving non-complex systems.

\n

Here's an example of JWT:

\n
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJlbWFpbCI6Im9sYXR1bmRlZ2FydWJhQGdtYWlsLmNvbSIsIm
\n

Now, let's authenticate/protect some routes.

\n

Pre-requisites:

\n\n

you can install all required packages by using following command:

\n
npm install express mongoose bcrypt  --save
\n

Step 1. First, create a directory structure as below :

\n

JWTApp

\n
-api\n--models\n----userModel.js\n--controllers\n----userController.js\n--route\n----userRoute.js\n--server.js
\n

Step 2. Install “jsonwebtoken” packageby using following command

\n
 npm install jsonwebtoken -- save
\n

Step 3. Create the user model

\n

In the api/models folder, create a file called user userModel.js by running touch api/models/userModel.js.

\n

In this file, create a mongoose schema with the following properties:

\n\n

Add the following code

\n
'use strict';\n\nvar mongoose = require('mongoose'),\n  bcrypt = require('bcrypt'),\n  Schema = mongoose.Schema;\n\n/**\n * User Schema\n */\nvar UserSchema = new Schema({\n  fullName: {\n    type: String,\n    trim: true,\n    required: true\n  },\n  email: {\n    type: String,\n    unique: true,\n    lowercase: true,\n    trim: true,\n    required: true\n  },\n  hash_password: {\n    type: String\n  },\n  created: {\n    type: Date,\n    default: Date.now\n  }\n});\n\nUserSchema.methods.comparePassword = function(password) {\n  return bcrypt.compareSync(password, this.hash_password);\n};\n\nmongoose.model('User', UserSchema);
\n

Step 4. Create the user handlers

\n

In the api/controllers folder, create a file called user userController.js by running touch api/controllers/userController.js

\n

In the userController file, create three different handlers to handle by using the following code

\n
'use strict';\n\nvar mongoose = require('mongoose'),\n  jwt = require('jsonwebtoken'),\n  bcrypt = require('bcrypt'),\n  User = mongoose.model('User');\n\nexports.register = function(req, res) {\n  var newUser = new User(req.body);\n  newUser.hash_password = bcrypt.hashSync(req.body.password, 10);\n  newUser.save(function(err, user) {\n    if (err) {\n      return res.status(400).send({\n        message: err\n      });\n    } else {\n      user.hash_password = undefined;\n      return res.json(user);\n    }\n  });\n};\n\nexports.sign_in = function(req, res) {\n  User.findOne({\n    email: req.body.email\n  }, function(err, user) {\n    if (err) throw err;\n    if (!user || !user.comparePassword(req.body.password)) {\n      return res.status(401).json({ message: 'Authentication failed. Invalid user or password.' });\n    }\n    return res.json({ token: jwt.sign({ email: user.email, fullName: user.fullName, _id: user._id }, 'RESTFULAPIs') });\n  });\n};\n\nexports.loginRequired = function(req, res, next) {\n  if (req.user) {\n    next();\n  } else {\n\n    return res.status(401).json({ message: 'Unauthorized user!!' });\n  }\n};\nexports.profile = function(req, res, next) {\n  if (req.user) {\n    res.send(req.user);\n    next();\n  } \n  else {\n   return res.status(401).json({ message: 'Invalid token' });\n  }\n};
\n

Note: A hash password was saved in the database using bcrypt.

\n

Step 6. In the api/route folder, create a file called user userRoute.js and add the following code:

\n
'use strict';\nmodule.exports = function(app) {\n    var userHandlers = require('../controllers/userController.js');\n    // todoList Routes\n    app.route('/tasks')\n        .post(userHandlers.loginRequired, userHandlers.profile);\n    app.route('/auth/register')\n        .post(userHandlers.register);\n   app.route('/auth/sign_in')\n        .post(userHandlers.sign_in);\n};
\n

Step 7. Add the following code in server.js

\n
'use strict';\n\nvar express = require('express'),\n  app = express(),\n  port = process.env.PORT || 3000,\n\n\n  User = require('./api/models/userModel'),\n  bodyParser = require('body-parser'),\n  jsonwebtoken = require("jsonwebtoken");\n\nconst mongoose = require('mongoose');\nconst option = {\n    socketTimeoutMS: 30000,\n    keepAlive: true,\n    reconnectTries: 30000\n};\n\nconst mongoURI = process.env.MONGODB_URI;\nmongoose.connect('mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb', option).then(function(){\n    //connected successfully\n}, function(err) {\n    //err handle\n});\n\napp.use(bodyParser.urlencoded({ extended: true }));\napp.use(bodyParser.json());\n\napp.use(function(req, res, next) {\n  if (req.headers && req.headers.authorization && req.headers.authorization.split(' ')[0] === 'JWT') {\n    jsonwebtoken.verify(req.headers.authorization.split(' ')[1], 'RESTFULAPIs', function(err, decode) {\n      if (err) req.user = undefined;\n      req.user = decode;\n      next();\n    });\n  } else {\n    req.user = undefined;\n    next();\n  }\n});\nvar routes = require('./api/routes/userRoutes');\nroutes(app);\n\napp.use(function(req, res) {\n  res.status(404).send({ url: req.originalUrl + ' not found' })\n});\n\napp.listen(port);\n\nconsole.log(' RESTful API server started on: ' + port);\n\nmodule.exports = app;
\n

Step 9. Now you just need to run the project by using the following command and try logging by using the JWT.

\n
npm start
\n

Step 10. Open Postman and create a post request to localhost:3000/auth/register as below:

\n

\"Postman

\n

Step 11. After this, let’s sign with this URL localhost:3000/auth/sign_in . Enter the keys and values for email and password

\n

\"Postman

\n

Under the value, add JWT and the token with a space between, like so:

\n
JWT eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJlbWFpbCI6Im9sYXR1bmRlZ2FydWJhQGdtYWlsLmNvbSIsImZ1bGxOYW1lIjoiT2xhdHVuZGUgR2FydWJhIiwiX2lkIjoiNThmMjYzNDdiMTY1YzUxODM1NDMxYTNkIiwiaWF0IjoxNDkyMjgwMTk4fQ.VcMpybz08cB5PsrMSr25En4_EwCGWZVFgciO4M-3ENE
\n

Step 11. Then, enter the parameters for the key and value for fetching the profile. You want to create as shown below and send:

\n

\"Postman

\n

As we have seen it is fairly easy to build a JWT authentication system with NodeJS, You can found the complete code used in this tutorial here.

\n","frontmatter":{"title":"NodeJS and MongoDB application authentication by JWT","author":{"id":"Ashish Sharma","github":"ashish8947","avatar":null},"date":"March 20, 2020","updated_date":null,"tags":["NodeJs","JWT","MongoDB","Authentication","JSON Web Token"],"coverImage":{"childImageSharp":{"fluid":{"aspectRatio":1.6666666666666667,"src":"/static/2b39d6f99b1ca5d4bc89d3bfccb6e29d/e9589/jwt.webp","srcSet":"/static/2b39d6f99b1ca5d4bc89d3bfccb6e29d/61e93/jwt.webp 200w,\n/static/2b39d6f99b1ca5d4bc89d3bfccb6e29d/1f5c5/jwt.webp 400w,\n/static/2b39d6f99b1ca5d4bc89d3bfccb6e29d/e9589/jwt.webp 500w","sizes":"(max-width: 500px) 100vw, 500px"}}}},"fields":{"authorId":"Ashish Sharma","slug":"/engineering/nodejs-and-mongodb-application-authentication-by-jwt/"}}}]},"authorYaml":{"id":"Ashish Sharma","bio":"Ashish is a software engineer who continually seeks clean, elegant solutions to business challenges. His lifelong passion for technology drives him to proactively expand horizons, constantly exploring and evaluating new languages, platforms, frameworks and tools.","github":"ashish8947","stackoverflow":null,"linkedin":"ashish-sharma-8996b213a","medium":"@sharma.ashish894789","twitter":null,"avatar":null}},"pageContext":{"id":"Ashish Sharma","__params":{"id":"ashish-sharma"}}},"staticQueryHashes":["1171199041","1384082988","2100481360","23180105","528864852"]}