Heroku uses the package.json file to npm install the packages itself. Make sure that you have the dependencies section:
package.json
npm install
"dependencies": { "express": "^4.16.3" }
note: be sure this dependencies section includes any packages you are using, or else they will not be installed.
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Heroku uses the
package.jsonfile tonpm installthe packages itself. Make sure that you have the dependencies section:"dependencies": {
"express": "^4.16.3"
}
note: be sure this dependencies section includes any packages you are using, or else they will not be installed.