Consider app.js
const { doCoolStuff } = require("./api/myApi");
// grab param from command line into "myParam"
doCoolStuff(myParam);
... // more code
And Package.json:
{
"name": "-------",
"version": "1.0.0",
"description": "",
"main": "app.js",
"scripts": {
"send": "node app.js"
},
...
}
How can we pass parameter to app.js when running npm run send ?
Something like npm run send myEmail@myDomain.com
Npm will parse any argument you pass to the script unless it's passed after -- followed by a space. After npm parses them, they'll be available under npm_config_ in the environment variables.
{
"scripts": {
"send": "echo \"send email to $npm_config_name @ $npm_config_mail "
}
}
Then run
npm run send --mail=xyz.com --name=sample
output: send email to sample@xyz.com
const params = process.argv.slice(2)
Now this param variable has all the parameters passed with the npm run command.
npm run send myEmail@domain.com
params[0] // this will provide you with the value myEmail@domain.com
Use process.argv to access the arguments in your script.
As for how to specify your arguments, see: Sending command line arguments to npm script