Is there a map function for objects in Node.js?

Better Stack Team
Updated on March 11, 2024

In JavaScript, the map function is typically used with arrays to transform each element of the array based on a provided callback function. If you want to achieve a similar result with objects, you can use a combination of Object.keys() and map to iterate over the keys of the object and transform their corresponding values.

Here's an example of how you can use the map function with objects:

const myObject = {
  key1: 'value1',
  key2: 'value2',
  key3: 'value3'

// Using Object.keys() to get an array of keys and then using map
const transformedObject = Object.fromEntries(
  Object.keys(myObject).map(key => [key, myObject[key] + '_modified'])


In this example:

  • Object.keys(myObject) is used to get an array of keys from the object.
  • The map function is then used to iterate over each key and transform its corresponding value. In this case, we are appending '_modified' to each value.
  • Object.fromEntries() is used to convert the array of key-value pairs back into an object.

This results in a new object where each value has been modified based on the transformation applied in the map callback function.

Note that Object.fromEntries() is used here to convert the array of key-value pairs back into an object. This method is available in modern JavaScript environments, so make sure your environment supports it or consider using a polyfill if needed.

Make your mark

Join the writer's program

Are you a developer and love writing and sharing your knowledge with the world? Join our guest writing program and get paid for writing amazing technical guides. We'll get them to the right readers that will appreciate them.

Write for us
Writer of the month
Marin Bezhanov
Marin is a software engineer and architect with a broad range of experience working...
Build on top of Better Stack

Write a script, app or project on top of Better Stack and share it with the world. Make a public repository and share it with us at our email.

or submit a pull request and help us build better products for everyone.

See the full list of amazing projects on github