Heroku, push rejected - node.js

Question

I am getting following error while trying to push my project to Heroku:
-----> Building on the Heroku-20 stack
-----> Using buildpack: heroku/nodejs
-----> Node.js app detected
-----> Creating runtime environment
NPM_CONFIG_LOGLEVEL=error
NODE_VERBOSE=false
NODE_ENV=production
NODE_MODULES_CACHE=false
-----> Installing binaries
engines.node (package.json): unspecified
engines.npm (package.json): unspecified (use default)
Resolving node version 14.x...
Downloading and installing node 14.17.3...
Using default npm version: 6.14.13
-----> Restoring cache
Caching has been disabled because NODE_MODULES_CACHE=false
-----> Installing dependencies
Installing node modules
added 118 packages in 2.552s
-----> Build
Running heroku-postbuild
> market#1.0.1 heroku-postbuild /tmp/build_ece853b3
> NPM_CONFIG_PRODUCTION=false npm install --prefix client && npm run build --prefix client
> core-js#2.6.12 postinstall /tmp/build_ece853b3/client/node_modules/babel-runtime/node_modules/core-js
> node -e "try{require('./postinstall')}catch(e){}"
> core-js#3.13.1 postinstall /tmp/build_ece853b3/client/node_modules/core-js
> node -e "try{require('./postinstall')}catch(e){}"
> core-js-pure#3.13.1 postinstall /tmp/build_ece853b3/client/node_modules/core-js-pure
> node -e "try{require('./postinstall')}catch(e){}"
> ejs#2.7.4 postinstall /tmp/build_ece853b3/client/node_modules/ejs
> node ./postinstall.js
added 1784 packages from 799 contributors and audited 1888 packages in 44.428s
137 packages are looking for funding
run `npm fund` for details
found 86 vulnerabilities (83 moderate, 3 high)
run `npm audit fix` to fix them, or `npm audit` for details
> client#0.1.0 build /tmp/build_ece853b3/client
> react-scripts build
Creating an optimized production build...
Failed to compile.
./src/App.scss
Cannot find module 'sass'
Require stack:
- /tmp/build_ece853b3/client/node_modules/sass-loader/dist/utils.js
- /tmp/build_ece853b3/client/node_modules/sass-loader/dist/index.js
- /tmp/build_ece853b3/client/node_modules/sass-loader/dist/cjs.js
- /tmp/build_ece853b3/client/node_modules/loader-runner/lib/loadLoader.js
- /tmp/build_ece853b3/client/node_modules/loader-runner/lib/LoaderRunner.js
- /tmp/build_ece853b3/client/node_modules/webpack/lib/NormalModule.js
- /tmp/build_ece853b3/client/node_modules/webpack/lib/NormalModuleFactory.js
- /tmp/build_ece853b3/client/node_modules/webpack/lib/Compiler.js
- /tmp/build_ece853b3/client/node_modules/webpack/lib/webpack.js
- /tmp/build_ece853b3/client/node_modules/react-scripts/scripts/build.js
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! client#0.1.0 build: `react-scripts build`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the client#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! /tmp/npmcache.nm2I7/_logs/2021-07-14T00_48_14_758Z-debug.log
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! market#1.0.1 heroku-postbuild: `NPM_CONFIG_PRODUCTION=false npm install --prefix client && npm run build --prefix client`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the market#1.0.1 heroku-postbuild 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! /tmp/npmcache.nm2I7/_logs/2021-07-14T00_48_14_782Z-debug.log
-----> Build failed
We're sorry this build is failing! You can troubleshoot common issues here:
https://devcenter.heroku.com/articles/troubleshooting-node-deploys
Some possible problems:
- Node version not specified in package.json
https://devcenter.heroku.com/articles/nodejs-support#specifying-a-node-js-version
- A module may be missing from 'dependencies' in package.json
https://devcenter.heroku.com/articles/troubleshooting-node-deploys#ensure-you-aren-t-relying-on-untracked-dependencies
Love,
Heroku
! Push rejected, failed to compile Node.js app.
! Push failed
I made a spelling mistake in package.json link. after correcting it I tried pushing the project to the heroku but getting error push failed. Locally the project is working fine.
here are dependencies in my root
package.json
"dependencies": {
"bcryptjs": "^2.4.3",
"cors": "^2.8.5",
"dotenv": "^10.0.0",
"express": "^4.17.1",
"jsonwebtoken": "^8.5.1",
"mongoose": "^5.13.2",
"morgan": "^1.10.0",
"multer": "^1.4.2"
}
and client side dependencies:
"dependencies": {
"#testing-library/jest-dom": "^5.12.0",
"#testing-library/react": "^11.2.7",
"#testing-library/user-event": "^13.1.9",
"axios": "^0.21.1",
"react": "^17.0.2",
"react-dom": "^17.0.2",
"react-paypal-button-v2": "^2.6.3",
"react-redux": "^7.2.4",
"react-router-dom": "^5.2.0",
"react-scripts": "^4.0.3",
"redux": "^4.1.0",
"redux-devtools-extension": "^2.13.9",
"redux-thunk": "^2.3.0",
"web-vitals": "^1.1.2"
},
"devDependencies": {
"node-sass": "^6.0.1"
}
Please help.
thanks

Answer 1

The problem was node-sass was not getting installed so I added:
"postinstall": "npm rebuild node-sass && npm install --unsafe-perm -f node-sass"
inside root package.json under scripts{}