[Node.js] Node Util Promisify - How to Convert Callback Based APIs to Promise-based

Since Node.js V8.0+, it introduces a 'util' libaray, which has a 'promisfy' function.

It can conver a callback based function to promise based function:

const util = require('util');

const crypto = require('crypto');

// convert a callback based code to promise based

const randomBytes = util.promisify(

  crypto.randomBytes

);

/* Example of callback based code

crypto.randomBytes(32, (err, num) => {

  console.log(num);

});

*/

// Since randomBytes function now is promise based

randomBytes(32)

  .then(num => console.log(num))

  .catch(err => console.error(err));

巴特西

[Node.js] Node Util Promisify - How to Convert Callback Based APIs to Promise-based

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