Understanding the Native API

Oct 13, 2025 by pinkandtrash.com 77 views

Introduction

Bun.js is a JavaScript runtime that provides a native API for reading periodical user input. In this article, we will explore how to read a single line user input using Bun.js. We will cover the basics of reading user input, handling user input, and provide examples of how to use the native API to read user input.

Understanding the Native API

Bun.js provides a native API for reading user input through the console object. The console object is a built-in object in Bun.js that provides a way to read and write data to the console. The console object has a write method that allows you to write data to the console, and a read method that allows you to read data from the console.

Reading Single Line User Input

To read a single line user input using Bun.js, you can use the following code:

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

This code uses the process.stdout.write method to write the prompt to the console, and then uses a for await loop to read the user input from the console. The for await loop is a new feature in Bun.js that allows you to read data from the console in a non-blocking way.

How it Works

When you run this code, it will write the prompt to the console and then wait for the user to type something. When the user types something and presses enter, the for await loop will read the user input and log it to the console.

Example Use Cases

Here are a few example use cases for reading single line user input with Bun.js:

**Simple Prompt
Q&A: Reading Single Line User Input with Bun.js =====================================================

Frequently Asked Questions

Q: What is the native API for reading user input in Bun.js?

A: The native API for reading user input in Bun.js is provided through the console object. The console object has a write method that allows you to write data to the console, and a read method that allows you to read data from the console.

Q: How do I use the `for await` loop to read user input in Bun.js?

A: To use the for await loop to read user input in Bun.js, you can use the following code:

for await (const line of console) {
  console.log(`You typed: ${line}`);
}

This code will read the user input from the console and log it to the console.

Q: What is the difference between `process.stdout.write` and `console.log`?

A: process.stdout.write is used to write data to the console without adding a newline character, while console.log is used to write data to the console and add a newline character.

Q: Can I use `console.log` to read user input in Bun.js?

A: No, console.log is used to write data to the console, not to read data from the console. To read user input in Bun.js, you need to use the for await loop with the console object.

Q: How do I handle errors when reading user input in Bun.js?

A: To handle errors when reading user input in Bun.js, you can use a try-catch block to catch any errors that occur when reading the user input.

Q: Can I use Bun.js to read user input from a file?

A: No, Bun.js is designed to read user input from the console, not from a file. If you need to read user input from a file, you will need to use a different library or API.

Q: Is the `for await` loop blocking or non-blocking?

A: The for await loop is non-blocking, which means that it will not block the execution of the code while waiting for user input.

Q: Can I use Bun.js to read user input in a web browser?

A: No, Bun.js is a Node.js runtime, and it is not designed to run in a web browser. If you need to read user input in a web browser, you will need to use a different library or API.

Q: How do I exit the `for await` loop when the user is finished typing?

A: To exit the for await loop when the user is finished typing, you can use the break statement to exit the loop.

Q: Can I use Bun.js to read user input in a production environment?

A: Yes, Bun.js can be used to read user input in a production environment. However, you will need to make sure that the code is properly secured and that any sensitive data is handled correctly.

Q: How do I handle user input that is too long?

A: To handle user input that is too long, you can use a try-catch block to catch any errors that occur when reading the user input, and then use a slice method to truncate the input to a maximum length.

Q: Can I use Bun.js to read user input in a real-time application?

A: Yes, Bun.js can be used to read user input in a real-time application. However, you will need to make sure that the code is properly optimized and that any sensitive data is handled correctly.