JWT in Node

Conclusion: jwt implement in node server

When a user who wanna go into our manage system must login in login page. And he’s info must be verify in server and send back a token as authorization when he request other data in manage system.

It’s very easy to implement jwt authorization with jsonwebtoken module in node server.

Let’s start with building a node server with experss.
First, new a folder in your computer and get into it, then execute statement below

npm init => then press enter until terminal told you press yes or not infomation

npm install experss jsonwebtoken -S => to install experss and jsonwebtoken module

when you finished ,you should have these file and folder

Now let code our server, and use postman that is a chrome extension to test api

Now node server listen 5000 port.

Use postman and send http request and see what we get.

we get the token!

let send token and pass verify.

caution: look at No.20 line ,I use secretkey as my private key to create token, then I must use it again when I verify token (at No 26 line) from client-side. create and verify token must use the same private key . otherwist ,authorization fail.

One more thing, We dont want to let token available forever, we mush give it a expiration. pls look at No 20 line , I use a configure object {expiresIn:'30s'}, it means that this token available in 30 seconds, when the time between your tow request larger then 30s , the token will invaild. You can use ‘1h’ => 1hours, ‘1d’ or ‘1day’.Look jsonwebtoken docs for details.

Finally, happy new year! ^_^