Convert a Callback-Based JavaScript Function to a Promise-Based One

Marius Schulz
InstructorMarius Schulz

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Sometimes, you might want to convert a JavaScript function that accepts a callback to one that returns a Promise object. This lesson shows how to manually wrap a promise-based API around the fs.readFile() function. It also explains how to use the util.promisify() method that is built into the Node.js standard library.