JWT

.env

+ACCESS_TOKEN=a1cf0e9b88b85a81ccfaebf1e7a1a5636fff70d16d9a68ee7c8f6e18985cbac68e6206175f319b0f045ca9554a38039cb11c50b18c92ab46abbd6d19b3904031
+REFRESH_ACCESS_TOKEN=1eab8976df88c553a16cecf187fc29c5cd9a16a5665c8571506acdb9d595587afbe76e8e2633fde572a20bb342d91bb4e508c26cb7837b62eedaffe73106d1f4
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.gitignore

+/node_modules

authentication.js

+const jwt= require("jsonwebtoken")
+
+const authontication=(req,res,next)=>{
+    const header = req.headers['authorization']
+    const token = header && header.split(' ')[1]
+    if(token == null)return res.status(400)
+    jwt.verify(token,process.env.ACCESS_TOKEN,(err,user)=>{
+        if(err) return res.status(403)
+        req.user = user
+    })
+    next()
+}
+
+module.exports= authontication
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package.json

+{
+  "name": "jwt_toots",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start": "nodemon server.js",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "dotenv": "^8.2.0",
+    "express": "^4.17.1",
+    "jsonwebtoken": "^8.5.1",
+    "nodemon": "^2.0.7"
+  }
+}

routes.js

+const express = require('express')
+const router = express.Router()
+const AUTH = require('./authentication.js')
+const jwt= require("jsonwebtoken")
+
+const post_data=[
+    {
+        name : "cool"
+    },
+    {
+        name:"coool1"
+    }
+]
+
+router.get('/',AUTH,(req,res)=>{
+    const post=post_data.filter(post=> post.name === req.user.name)
+    if(post.length == 0){
+        res.json({message:"this is empty"})
+    }else{
+        res.json({data:post_data.filter(post=> post.name === req.user.name)})
+    }   
+})
+router.post('/login',(req,res)=>{
+    const name = req.body.name 
+    const user = {name : name}
+    const access_token=jwt.sign(user,process.env.ACCESS_TOKEN,{expiresIn : '100s'})
+    res.json({access_token:access_token})
+})
+
+module.exports = router
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server.js

+require('dotenv').config()
+const express = require('express')
+const app = express()
+const jwt = require('jsonwebtoken')
+const router = require('./routes.js')
+//to parse the data in json
+app.use(express.json())
+
+//api for jwt authentication
+app.use('/api',router)
+
+//port config
+app.listen(3000,()=>console.log("this server is running at 3000"))
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