javascriptstdinpromptreadlinebun

How can I read a single line user input with Bun.js?

Bun.js has a nice native API to read periodical user input:

const prompt = "Type something: ";
process.stdout.write(prompt);
for await (const line of console) {
  console.log(`You typed: ${line}`);
  process.stdout.write(prompt);
}

But...

I want to read user inputs, outside a loop!

I found this solution:

const stdinIterator = process.stdin.iterator()

console.write('What is your first name?\n> ')
const firstName = (await stdinIterator.next()).value.toString().trimEnd()
console.log('Hello,', firstName)

console.write('What is your last name?\n> ')
const lastName = (await stdinIterator.next()).value.toString().trimEnd()
console.log('Welcome', `${firstName} ${lastName}`)

It works. But then the process is not terminated automatically (I need to press Ctrl+C manually).

Solution

  • Bun.js has implemented prompt API.

    Use it and enjoy:

    const firstName = prompt('What is your first name?')
console.log('Hello,', firstName)

const lastName = prompt('What is your last name?')
console.log('Welcome', `${firstName} ${lastName}`)

    See: https://bun.sh/docs/api/globals