Express JS Tutorial #12 - Middleware | Expressjs Tutorial For Beginners

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[@derickasane8499]

nice tutorial sir. you are the best

[@narendran-nn4ew]

i am getting this Error. Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client onst express=require("express"); const router=express.Router(); router.use("/",(req,res,next)=>{ req.headers["content-type"]='application/json'; console.log("api is calling"); next(); }); router.get("/",(req,res,next)=>{ res.send("header recived"+ req.headers["content-type"]); res.send("successfully getting data"); next(); }); router.use("/",(req,res)=>{ console.log("api is close"); }); router.get("/getting/:state/:city",(req,res)=>{ res.send("hi getting of "+req.params.state+req.params.city); }); router.get("/serch/:key([0-9]{4})",(req,res)=>{ res.send("hi getting of "+req.params.key); }); router.get("/serching/:key([a-zA-Z]{4})",(req,res)=>{ res.send("hi getting of "+req.params.key); }); router.get("*",(req,res)=>{ const errobj={ status:404, message:"URL is not found " }; res.json(errobj); }); module.exports=router; Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client

[@LH-ky6hh]

Hi, I think it would be better for you to use the nodejs intellisense to avoid any syntax error, and make sure to npm i @types/node as well

[@ARCTutorials]

That also sounds good (y)

[@venkatagopiyadlapalli2353]

Sir if you don't mine show on the browser instead of postman tool and also clumji

[@bahadurkhan4918]

Sir nice tutorials👌. Please make a tutorial on how can I integrate angular app with nodejs express Just like real time development. Create an app from scratch of which main goal only showing how a real app developed.video forwarded is good or more helpful for us. I have one more doubt ng app has routing and nodejs as well, so how does they interact together. Again i request to you please make one more tutorial on this topic.

[@ARCTutorials]

Sure Bahadur. I will be resuming the series from tomorrow.

[@jayasreekarunanithi8487]

sir .. can you share notes link or git repo link?...thank you in adavance sir

[@astroyussuf]

when i try the same example, i see the middleware console print twice, looks like its called twice. how to resolve it?

[@ARCTutorials]

Hi there. Can u pls send me screenshot of your code at [e-mail]

[@astroyussuf]

@@ARCTutorials Sorry it was my mistake, instead of having the middleware functions inside the route pages, i kept it in the index.js and tried it. So it called the middleware function twice. First call happened when the endpoint is called and Second call when the "app.listen()" was called. when I placed the code in the route page it worked perfect. Thanks for your quick response

[@rohitsachdeva4624]

Sridhar please upload the later parts waiting for them.

[@rohitsachdeva4624]

And when we are doing console.log in the index.js then it is reflecting in the terminal but not on the browsers console.why that ?

[@ARCTutorials]

More videos coming today Rohit. I will explain the console log too

[@rohitsachdeva4624]

@@ARCTutorials thanks Sridhar

[@rohitsachdeva4624]

I used the api end point of express js and used it in my angular project it gave me error of cors policy.can you suggest some ways to figure it out too.

[@suryaways-the_sun_rise]

This is how it use in real time sir

[@ARCTutorials]

Thanks Surya

[@himanshuarora1910]

what is difference between router.use ,,,router.get ,,,can u explain in detail please

[@ramanraman6286]

bro please do file uploading in express

[@ARCTutorials]

Coming up in next week

[@johnbariquit6692]

still not running with this code sir router.use('/', (req, res, next) => { req.headers['content-type']='application/json'; console.log("API called recieved"); next(); }); router.get('/', (req ,res, next) => { res.send("Headers recieved" + req.headers['content-type']); res.send("Get request for users"); next(); }); it says: Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client at new NodeError (internal/errors.js:322:7) at ServerResponse.setHeader (_http_outgoing.js:561:11) at ServerResponse.header (/Users/cb0011juan/Desktop/last year/expressJs/node_modules/express/lib/response.js:776:10) at ServerResponse.send (/Users/cb0011juan/Desktop/last year/expressJs/node_modules/express/lib/response.js:170:12) at /Users/cb0011juan/Desktop/last year/expressJs/routes/users.js:16:9 at Layer.handle [as handle_request] (/Users/cb0011juan/Desktop/last year/expressJs/node_modules/express/lib/router/layer.js:95:5) at next (/Users/cb0011juan/Desktop/last year/expressJs/node_modules/express/lib/router/route.js:137:13) at Route.dispatch (/Users/cb0011juan/Desktop/last year/expressJs/node_modules/express/lib/router/route.js:112:3) at Layer.handle [as handle_request] (/Users/cb0011juan/Desktop/last year/expressJs/node_modules/express/lib/router/layer.js:95:5) at /Users/cb0011juan/Desktop/last year/expressJs/node_modules/express/lib/router/index.js:281:22

[@ashokchhetri8667]

its because you are sending response twice res.send("Headers recieved" + req.headers['content-type']); res.send("Get request for users"); so,It is giving you warning and remove the next() func from the second route handler middleware