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Can´t start the server created from the express.js generator

I am trying to setup a express.js server using there generator. I have followed the documation and I have succesfully created the basic structure. However if I try to run the given command (SET DEBUG=transcriptverificationserver:* & npm start) to start the server I always get the following error:
npm ERR! Missing script: "start"
npm ERR!
npm ERR! Did you mean one of these?
npm ERR! npm stars # View packages marked as favorites
npm ERR!
npm ERR! To see a list of scripts, run:
npm ERR! npm run
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\a\AppData\Local\npm-cache\_logs\2022-11-28T22_43_43_285Z-debug-0.log
PS C:\Users\a\Desktop\Verified Transcripts\Webpage> npm start
npm ERR! Missing script: "start"
npm ERR!
npm ERR! Did you mean one of these?
npm ERR! npm star # Mark your favorite packages
npm ERR! npm stars # View packages marked as favorites
npm ERR!
npm ERR! To see a list of scripts, run:
npm ERR! npm run
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\a\AppData\Local\npm-cache\_logs\2022-11-28T22_45_41_209Z-debug-0.log
I assume its an issue within the package.json file. The script part looks as following:
"scripts": {
"start": "node ./bin/www"
},
I haven´t change anything in the files or structure and I was simply copying the commands from the documentation (https://expressjs.com/en/starter/generator.html)
Thanks for any help in advance

I have tried it again and this time everthing works. I am not sure what has happend before but I might have used the old installation method.
$ npm install -g express-generator
$ express
With my secound try I ensured to use the new method:
$ npx express-generator

Error: Failed to find .env file at default paths

I recently switched to using dev.env & test.env for a REST API using Javascript and I'm getting the following error:
$ npm run dev
Error: Failed to find .env file at default paths: [./.env,./.env.js,./.env.json]
at getEnvFile
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! taskr#1.0.0 dev: env-cmd ./config/dev.env nodemon src/index.js
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the taskr#1.0.0 dev script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
Is there something I should revise in the way my .env files are stored/accessed?

try:
env-cmd -f ./config/dev.env nodemon src/index.js

React app not Building shows code ELIFECYCLE

This error is shown whenever i try to build the project. Can someone please help me with this
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! covid-19-world#0.1.0 build: react-scripts build
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the covid-19-world#0.1.0 build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\uniqf\AppData\Roaming\npm-cache_logs\2020-09-02T16_41_30_577Z-debug.log
The terminal process "C:\WINDOWS\System32\WindowsPowerShell\v1.0\powershell.exe -Command npm run build" terminated with exit code: 1.

You can try the following -
Delete the node_modules folder
Delete the package-lock.json if it exists
run npm install in the terminal

Yes I found the problem and solved it by removing the cache, Doing what SFUE said above and created a new project with all the source code of earlier and I was able to build the project

I tried to run command "npm run start " and it showd up with this error in react js

'react-scripts' is not recognized as an internal or external command,
operable program or batch file.
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! bookbhandar#0.1.0 start: react-scripts start
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the bookbhandar#0.1.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\Laxman\AppData\Roaming\npm-cache_logs\2020-08-22T18_25_37_539Z-debug.log
Can some one help me with this error?

It seems like react-scripts is not installed into your node_modules folder. Try to check if you are running the command on the correct folder and if the react-scripts dependency is in the package.json file.
Otherwise try to delete the node_modules folder and run npm i.

Unable to install node modules because 'This is related to npm not being able to find a file.'

So in my recent project I tried to install some node modules, in this case, express and MySQL, which both return the same error:
npm WARN thecaptain.ga#1.0.0 No repository field.
npm ERR! path C:\Users\user\projectroot\node_modules\on-finished
npm ERR! code ENOENT
npm ERR! errno -4058
npm ERR! syscall rename
npm ERR! enoent ENOENT: no such file or directory, rename 'C:\Users\user\projectroot\node_modules\on-
finished' -> 'C:\Users\user\projectroot\node_modules.on-finished.DELETE'
npm ERR! enoent This is related to npm not being able to find a file.
npm ERR! enoent
npm ERR! A complete log of this run can be found in:
I tried to delete all the related files, then reinstalling it, however that did not change anything. I have run npm init before the install even attempted to fill in the dependency manually, to then run npm install. It happens with every node module in any node project I have.

Turns out the issue was because the dropbox tried to synchronize the files as i was installing the package. Pausing or disabling this fixes the issue...

Could you try this please:
1 - Ensure no NPM scripts are running.
2 - Navigate to your project route
3 - Run this command:
rm package-lock.json && npm i
Note - it may also be worth trying to delete your 'node_modules' folder in your project directory and running the above command.