Below is a brief code snippet I've provided:
...
const url = typeof process.env.url === 'string' ? process.env.url : {do not start a server}
...
server.start(options, ({ port }) => console.log(`Server is running on http://localhost:${port}`));
Is there a way to handle the case where process.env.url is not set in order to prevent starting a server? I would like to either throw an error or display a message (as shown in the code sample).
To solve this issue, you can simply implement an if statement:
const website = process.env.website || false
if(!website) {
console.log('an error occurred..');
process.exit(0)
}
...
If the URL passed is not valid, you can handle it by throwing an error and exiting the process:
function checkUrlValidity() {
throw new Error('The provided URL is invalid!');
process.exit();
}
const url = typeof process.env.url === 'string' ? process.env.url : checkUrlValidity();
server.start(options, ({ port }) => console.log(`Server is now live at http://localhost:${port}`));
let link = typeof process.env.url === 'string' ? process.env.url : new Error("Invalid URL")
if(link instanceof Error) {
throw link;
}
server.start(options, ({ port }) => console.log(`Server is live at http://localhost:${port}`));
You have the ability to modify Error Message to trigger an error and halt the server
let link = typeof process.env.url === 'string' ? process.env.url : null
if(!link) {
process.exit(0);
}
server.start(options, ({ port }) => console.log(`Server is live at http://localhost:${port}`));
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