Pify is a handy JavaScript package that converts callback-style functions and module methods into Promises. This simplifies handling asynchronous operations and improves your code readability by replacing traditional callbacks with promise-based syntax.

How do you use pify?

To use Pify, you first need to install it through npm by running npm install pify. This package can be utilized to promisify a single function or all methods within a module. For example, to promisify the filesystem's readFile method, you can write:

import fs from 'fs';
import pify from 'pify';

// Promisify the fs.readFile function
const data = await pify(fs.readFile)('package.json', 'utf8');
console.log(JSON.parse(data).name);

Another approach is to promisify all methods in a module:

const data2 = await pify(fs).readFile('package.json', 'utf8');
console.log(JSON.parse(data2).name);

Furthermore, Pify provides various options for customizing the promisification process such as handling multiple arguments, selecting specific methods to promisify, excluding certain methods, choosing whether to promisify the main function, and specifying a custom promise module.

Where are the pify docs?

Pify's documentation is available in the readme file on the package's GitHub repository, which can be accessed at https://github.com/sindresorhus/pify. The readme provides in-depth details about Pify's API, usage examples, answers to frequently asked questions, and information about the installation process.