when i try to run nodemonindex.js i get this error i have pm2 running but my localhost/5002 gives
[nodemon] starting `node index.js`
Listening on 5002
events.js:377
throw er; // Unhandled 'error' event
^
Error: listen EADDRINUSE: address already in use :::5002
at Server.setupListenHandle [as _listen2] (net.js:1331:16)
at listenInCluster (net.js:1379:12)
at Server.listen (net.js:1465:7)
at Function.listen (/home/vivek/mycodes/ask-backend/node_modules/express/lib/application.js:618:24)
at Object.<anonymous> (/home/vivek/mycodes/ask-backend/index.js:19:5)
at Module._compile (internal/modules/cjs/loader.js:1085:14)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1114:10)
at Module.load (internal/modules/cjs/loader.js:950:32)
at Function.Module._load (internal/modules/cjs/loader.js:790:12)
at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:76:12)
Emitted 'error' event on Server instance at:
at emitErrorNT (net.js:1358:8)
at processTicksAndRejections (internal/process/task_queues.js:82:21) {
code: 'EADDRINUSE',
errno: -98,
syscall: 'listen',
address: '::',
port: 5002
}
[nodemon] app crashed - waiting for file changes before starting...
i tryed pm2 kill killall node still port doesnot die this happed after i pulled my code from github and running on a new machine i dont know whethere the db is the reson for this error
index.js
var moment = require("moment");
var express = require("express");
var ObjectId = require("mongodb").ObjectID;
const { ExploreTrendRequest } = require("g-trends");
var bodyParser = require("body-parser");
var app = express();
// if (process.env.NODE_ENV == "production") {
// app.use(express.static("portfolio/build"));
// const path = require("path");
// app.get("*", (req, res) => {
// res.sendFile(path.resolve(__dirname, "portfolio", "build", "index.html"));
// });
// }
const PORT = process.env.PORT || 5002;
express().listen(PORT, () => console.log(`Listening on ${PORT}`));
app.listen(process.env.PORT || 5002);
const multer = require("multer");
const upload = multer();
var bodyParser = require("body-parser");
app.use(express.json());
var MongoClient = require("mongodb").MongoClient;
var id = require("mongodb").ObjectID;
//Create a database named "mydb": sudo service mongod start
var url = "mongodb://localhost:27017/";
MongoClient.connect(url, { useUnifiedTopology: true }, function (err, db) {
if (err) throw err;
var mydb = db.db(mydb);
var created = moment().format("YYYY-MM-DD hh:mm:ss");
// mydb.createCollection("questions", function (err, data) {
// if (err) throw err;
// var question = {
// question: "the first question",
// time: created,
// };
// mydb.collection("questions").insertOne(question, function (err, data) {
// if (err) throw err;
// console.log("Data created!");
app.use(function (req, res, next) {
// Website you wish to allow to connect
res.setHeader("Access-Control-Allow-Origin", "http://localhost:3000");
// Request methods you wish to allow
res.setHeader(
"Access-Control-Allow-Methods",
"GET, POST, OPTIONS, PUT, PATCH, DELETE"
);
// Request headers you wish to allow
res.setHeader(
"Access-Control-Allow-Headers",
"X-Requested-With,content-type"
);
// Set to true if you need the website to include cookies in the requests sent
// to the API (e.g. in case you use sessions)
res.setHeader("Access-Control-Allow-Credentials", true);
// Pass to next layer of middleware
next();
});
app.use(express.urlencoded({ extended: true }));
app.post("/questionpost", function (req, res) {
let formData = req.body;
// let bodyJson = JSON.parse(formData);
console.log(formData);
mydb.collection("questions").insertOne(formData, (err, result) => {
if (err) {
res.send({ error: "Ann error has occured" });
} else {
res.send(result.ops[0]);
}
});
});
app.post("/answerpost", function (req, res) {
let formData = req.body;
// let bodyJson = JSON.parse(formData);
// console.log(formData);
mydb.collection("answers").insertOne(formData, (err, result) => {
if (err) {
res.send({ error: "Ann error has occured" });
} else {
res.send(result.ops[0]);
}
});
});
app.get("/answersapi/:gotid", function (req, res) {
let id = req.params.gotid;
console.log(id);
mydb
.collection("answers")
.find({ question_id: id })
.toArray(function (err, data) {
if (err) throw error;
res.send(data);
});
});
// mydb
// .collection("questions")
// .insertOne(formData)
// .toArray(function (err, res) {
// if (err) throw err;
// console.log("1 document inserted");
// });
// res.send(res);
// app.post("/questionpost", jsonParser, function (req, res) {
// let data = req;
// console.log(data);
// });
app.get("/questapi", function (req, res) {
console.log("apicalled");
mydb
.collection("questions")
.find({})
.toArray(function (err, data) {
if (err) throw error;
res.send(data);
});
});
//http://localhost:5002/answerpost
// increment;
app.post("/increment", function (req, res) {
let id = req.body;
var correctcount = id.correctcount 1;
//var ansid = id.Answer_id;
var realid = ObjectId(id.Answer_id);
console.log(correctcount);
// var myquery = { address: "Valley 345" };
// var newvalues = { $set: { name: "Mickey", address: "Canyon 123" } };
// dbo
// .collection("customers")
// .updateOne(myquery, newvalues, function (err, res) {
// if (err) throw err;
// console.log("1 document updated");
// db.close();
// });
mydb
.collection("answers")
.updateOne(
{ _id: realid },
{ $set: { correctcount: correctcount } },
function (err, data) {
if (err) throw err;
console.log("1 document updated");
res.send(data);
}
);
});
app.post("/decrementer", function (req, res) {
let id = req.body;
var wrongcount = id.wrongcount - 1;
//var ansid = id.Answer_id;
var realid = ObjectId(id.Answer_id);
console.log(wrongcount);
// var myquery = { address: "Valley 345" };
// var newvalues = { $set: { name: "Mickey", address: "Canyon 123" } };
// dbo
// .collection("customers")
// .updateOne(myquery, newvalues, function (err, res) {
// if (err) throw err;
// console.log("1 document updated");
// db.close();
// });
mydb
.collection("answers")
.updateOne(
{ _id: realid },
{ $set: { wrongcount: wrongcount } },
function (err, data) {
if (err) throw err;
console.log("1 document updated");
res.send(data);
}
);
});
app.get("/questone/:gotid", function (req, res) {
let id = req.params.gotid;
// /console.log(id);
mydb
.collection("questions")
.find({ _id: ObjectId(id) })
.toArray(function (err, data) {
if (err) throw error;
//console.log(data);
res.send(data);
});
});
//trend api call
app.post("/trend", function () {
const explorer = new ExploreTrendRequest();
console.log("api calling 1");
explorer
.addKeyword("Dream about snakes")
.compare("Dream about falling")
.download()
.then((csv) => {
console.log(
"[✔] Done, take a look at your beautiful CSV formatted data!"
);
console.log(csv);
})
.catch((error) => {
console.log("[!] Failed fetching csv data due to an error", error);
});
});
});
i have posted my index.js here so that u can reffer what the error is
CodePudding user response：
If it works on another computer, this is probably not a problem with your app. The port is simply already in use by another process. Possibly a whole another application. What you want to do is to
- Identify the process that is already using the port
- kill it
If you use Mac, you do that by first running sudo lsof -i -P | grep LISTEN. This will list all processes that are listening on any port. Find the one running on port 5002 (since this is the one you're using here). The second column in the table that lsof produced is a process number. Now you can run kill -9 <process number>. After that your application should work