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npm start: npm start script is used to execute the defined file in it without typing its execution command. Package.json file "scripts"{ "start":"node index.js" } index.js.
npm run sets the NODE environment variable to the node executable with which npm is executed. If you try to run a script without having a node_modules directory and it fails, you will be given a warning to run npm install , just in case you've forgotten.
Few things to understand: npm: run command is mandatory to execute user defined scripts. yarn: run command is not mandatory to execute user defined scripts. start command is not a user defined script name, so you may not need to specify run command to execute it.
So npm start runs the node script that is listed under start in the package. json. As in the article that cbr mentioned in a comment, in the case of create-react-app , this happens: A new instance of the WebpackDevServer from the library of the same name is created, passing in the compiler and configuration.
npm test, npm start, npm restart, and npm stop are all aliases for npm run xxx.
For all other scripts you define, you need to use the npm run xxx syntax.
See the docs at https://docs.npmjs.com/cli/run-script for more information.
npm start is the short form for npm run start. So, its one and the same thing.
One interesting thing to note is,
If the scripts object does not have a "start" property in package.json file, npm start or npm run start from command line will run node server.js by default.
But if the scripts object in package.json has "start" property, it overrides node server.js and executes the command in "start" property.
See - https://docs.npmjs.com/cli/v7/commands/npm-start#description
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