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

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[LH-kyhh]

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

[cloudwings]

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.

[narendran-nnew]

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)=>{

console.log("api is calling");
next();
});

router.get("/", (req, res, next)=>{
res.send("header recived"+
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
});
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

[venkatagopiyadlapalli]

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

[astroyussuf]

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

[rohitsachdeva]

Sridhar please upload the later parts waiting for them.

[himanshuarora]

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

[ramanraman]

bro please do file uploading in express

[johnbariquit]

still not running with this code sir

router.use('/', (req, res, next) => {


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
at ServerResponse.send
at
at Layer.handle [as handle_request]
at next
at Route.dispatch
at Layer.handle [as handle_request]
at