ReferenceError: parseCookies is not defined even i had imported it - node.js

Question

I am using NextJs and it's serverless functions.
I have a api route /api/blog/write, it is a protected route. Only authorize users can access it. For this i defined a middleware which check if request is comeing from a authorize user then processed other wise redirect request to login page.
api/blog/write.js
import requiredLogin from "#middleware/required-login";
const index= (req, res) => {
const cookies = parseCookies({req}).ts
res.statusCode = 200
return res.json({ status: 'Your first blog' })
}
export default requiredLogin(index);
#middleware/required-login.js
import { parseCookies } from 'nookies';
import jwt from "jsonwebtoken";
const JWT_KEY = process.env.JWT_KEY;
const requiredLogin = (handler) => (req,res)=>{
const token = parseCookies({req}).ts;
jwt.verify(token,JWT_KEY,(err,dev)=>{
if(err) return res.status(401).redirect("/auth?auth=signin")();
return handler(req,res);
})
}
module.exports = requiredLogin;
Using the above code for required-login.js gives me
status code : 500 and error is ReferenceError: parseCookies is not defined.
When i just replace return handler(req,res); in required-login.js with return res.status(200).send(dev) then i am getting expected result.
error consoled by node is
ReferenceError: parseCookies is not defined
at index (C:\Users\Rahul kumar\desktop\Projects\dev\bdevg\.next\server\pages\api.js:110:19)
at C:\Users\Rahul kumar\desktop\Projects\dev\bdevg\.next\server\pages\api.js:151:12
at C:\Users\Rahul kumar\desktop\Projects\dev\bdevg\node_modules\jsonwebtoken\verify.js:223:12
at getSecret (C:\Users\Rahul kumar\desktop\Projects\dev\bdevg\node_modules\jsonwebtoken\verify.js:90:14)
at Object.module.exports [as verify] (C:\Users\Rahul kumar\desktop\Projects\dev\bdevg\node_modules\jsonwebtoken\verify.js:94:10)
at C:\Users\Rahul kumar\desktop\Projects\dev\bdevg\.next\server\pages\api.js:148:25
at apiResolver (C:\Users\Rahul kumar\desktop\Projects\dev\bdevg\node_modules\next\dist\next-server\server\api-utils.js:8:7)
at processTicksAndRejections (internal/process/task_queues.js:97:5)
at async DevServer.handleApiRequest (C:\Users\Rahul kumar\desktop\Projects\dev\bdevg\node_modules\next\dist\next-server\server\next-server.js:45:397)
at async Object.fn (C:\Users\Rahul kumar\desktop\Projects\dev\bdevg\node_modules\next\dist\next-server\server\next-server.js:37:176)

Answer 1

parseCookies is not defined in api/blog/write.js, and you use it there.
Since Node.JS (and JavaScript itself) doesn't expose variables defined in one file to another file that has be "required" by that file, you cannot access parseCookies in api/blog/write.js.
You must import it there as well.
// You must import `parseCookies`!
import { parseCookies } from 'nookies';
import requiredLogin from "#middleware/required-login";
const index= (req, res) => {
// You use parseCookies on the following line,
// so you have to import it.
const cookies = parseCookies({req}).ts
res.statusCode = 200
return res.json({ status: 'Your first blog' })
}
export default requiredLogin(index);