Express.js server not starting post-nodemon install


I have an Express.js server currently set up like this:

  • index.js
const server = require('./server');
const port = process.env.PORT || 5000;
console.log("index.js is called")
server.listen(port, () =>
  console.log(`Server is listening on http://localhost:${port}`)
  • server.js
const express = require('express');
const routes = require('./routes');
const server = express();
console.log("server.js is called")
module.exports = server;
  • part of package.json
{ ...
"main": "index.js",
  "scripts": {
    "test": "jest",
    "startDev": "nodemon index.js",
    "start": "node server.js"

Last night I ran npm install --save-dev nodemon and after an error message; npm install --save-dev dotenv (we do have a .env file), both in the root of my project directory. Afterwards I was able to use npm start to successfully start the server, and nodemon worked properly (restarting upon crash). After git push-ing to GitHub and opening a PR to merge with the main branch, a team member was forced to delete the server’s package-lock.json due to merge conflicts, and merged the branch. We figured this was ok since package-lock.json will be rebuilt with npm install. After git pull-ing in my main branch this morning, and running npm start, I got only the following output:

$ npm start

[email protected] start
node server.js


Instead of the expected:

$ npm start
> [email protected] start
> nodemon index.js

[nodemon] 2.0.19
[nodemon] to restart at any time, enter `rs`
[nodemon] watching path(s): *.*
[nodemon] watching extensions: js,mjs,json
[nodemon] starting `node index.js`
Server is listening on http://localhost:5000


When I put a console.log() statement in both index.js and server.js I only see the text from server.js. Trying various solutions from this stackoverflow topic hasn’t solved the issue. I’ve tried various other "start" commands like npm startDev, npm server.js, npm index.js, node start, nodemon, nodemon start, nodemon server.js, nodemon server.js, and likely some I’m omitting. I’ve tried changing "startDev" to "node ./bin/www" and "nodemon ./bin/www" without luck.

Anyone have any ideas as to why the server isn’t starting, or any troubleshooting suggestions? My teammate isn’t having any issues on his Mac (I’m running Linux Mint 20.2).


I found the solution elsewhere. I needed to run npm run startDev. npm start doesn’t need run but if you specify something like startDev, one needs run.

Answered By – RainyCityCoder

This Answer collected from stackoverflow, is licensed under cc by-sa 2.5 , cc by-sa 3.0 and cc by-sa 4.0

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