How can I use variables in my npm scripts?

How can I use variables in my npm scripts?

You can use environment variables in your npm scripts by referencing them with the syntax ${VARIABLE_NAME}. For example, you can set a variable in your script like this: "start": "NODE_ENV=production node app.js".

Can I set default values for these variables?

Yes, you can set default values using the || operator. For example: "start": "NODE_ENV=${NODE_ENV||development} node app.js".

What if I want to pass variables from the command line?

You can pass variables directly in the command line when running your npm script. For example: NODE_ENV=production npm run start.

Are there any tools to help manage these variables?

Yes, you can use tools like dotenv to manage environment variables in a .env file, making it easier to handle different configurations.