Failed at the app#0.0.1 start script. start: `nest start` - npm

Question

I am deploying NestJs app on elastic beanstalk, after successfull deployment, app is not started and shows error at start script but when I login to Amazon Linux 2 ec2 instance and run node dist/main, it start running and not otherwise with npm start.
Logs:
0 info it worked if it ends with ok
1 verbose cli [
1 verbose cli '/opt/elasticbeanstalk/node-install/node-v12.19.0-linux-x64/bin/node',
1 verbose cli '/bin/npm',
1 verbose cli 'start'
1 verbose cli ]
2 info using npm#6.14.8
3 info using node#v12.19.0
4 verbose run-script [ 'prestart', 'start', 'poststart' ]
5 info lifecycle unmudl-backend-app#0.0.1~prestart: unmudl-backend-app#0.0.1
6 info lifecycle unmudl-backend-app#0.0.1~start: unmudl-backend-app#0.0.1
7 verbose lifecycle unmudl-backend-app#0.0.1~start: unsafe-perm in lifecycle true
8 verbose lifecycle unmudl-backend-app#0.0.1~start: PATH: /opt/elasticbeanstalk/node-install/node-v12.19.0-linux-x64/lib/node_modules/npm/node_modules/npm-lifecycle/node-gyp-bin:/var/app/current/node_modules/.bin:/sbin:/bin:/usr/sbin:/usr/bin
9 verbose lifecycle unmudl-backend-app#0.0.1~start: CWD: /var/app/current
10 silly lifecycle unmudl-backend-app#0.0.1~start: Args: [ '-c', 'nest start' ]
11 silly lifecycle unmudl-backend-app#0.0.1~start: Returned: code: 1 signal: null
12 info lifecycle unmudl-backend-app#0.0.1~start: Failed to exec start script
13 verbose stack Error: unmudl-backend-app#0.0.1 start: `nest start`
13 verbose stack Exit status 1
13 verbose stack at EventEmitter.<anonymous> (/opt/elasticbeanstalk/node-install/node-v12.19.0-linux-x64/lib/node_modules/npm/node_modules/npm-lifecycle/index.js:332:16)
13 verbose stack at EventEmitter.emit (events.js:314:20)
13 verbose stack at ChildProcess.<anonymous> (/opt/elasticbeanstalk/node-install/node-v12.19.0-linux-x64/lib/node_modules/npm/node_modules/npm-lifecycle/lib/spawn.js:55:14)
13 verbose stack at ChildProcess.emit (events.js:314:20)
13 verbose stack at maybeClose (internal/child_process.js:1021:16)
13 verbose stack at Process.ChildProcess._handle.onexit (internal/child_process.js:286:5)
14 verbose pkgid unmudl-backend-app#0.0.1
15 verbose cwd /var/app/current
16 verbose Linux 4.14.200-155.322.amzn2.x86_64
17 verbose argv "/opt/elasticbeanstalk/node-install/node-v12.19.0-linux-x64/bin/node" "/bin/npm" "start"
18 verbose node v12.19.0
19 verbose npm v6.14.8
20 error code ELIFECYCLE
21 error errno 1
22 error unmudl-backend-app#0.0.1 start: `nest start`
22 error Exit status 1
23 error Failed at the unmudl-backend-app#0.0.1 start script.
23 error This is probably not a problem with npm. There is likely additional logging output above.
24 verbose exit [ 1, true ]

Answer 1

You need to change the value of your "start" in package.json to "npm i -g #nestjs/cli && node dist/main"
it should look like the following line:
"start": "npm i -g #nestjs/cli && node dist/main"
and if you are using prisma you will need to do it like:
"start": "npm i -g #prisma/cli #nestjs/cli && prisma generate && node
dist/main"