The Object.fromEntries() method transforms a list of key-value pairs into an object.




An iterable such as Array or Map or other objects implementing the iterable protocol.

Return value

A new object whose properties are given by the entries of the iterable.


The Object.fromEntries() method takes a list of key-value pairs and returns a new object whose properties are given by those entries. The iterable argument is expected to be an object that implements an @@iterator method, that returns an iterator object, that produces a two element array-like object, whose first element is a value that will be used as a property key, and whose second element is the value to associate with that property key.

Object.fromEntries() performs the reverse of Object.entries().


Converting a Map to an Object

With Object.fromEntries, you can convert from Map to Object:

const map = new Map([ ['foo', 'bar'], ['baz', 42] ]);
const obj = Object.fromEntries(map);
console.log(obj); // { foo: "bar", baz: 42 }

Converting an Array to an Object

With Object.fromEntries, you can convert from Array to Object:

const arr = [ ['0', 'a'], ['1', 'b'], ['2', 'c'] ];
const obj = Object.fromEntries(arr);
console.log(obj); // { 0: "a", 1: "b", 2: "c" }

Object transformations

With Object.fromEntries, its reverse method Object.entries(), and array manipulation methods, you are able to transform objects like this:

const object1 = { a: 1, b: 2, c: 3 };

const object2 = Object.fromEntries(
  .map(([ key, val ]) => [ key, val * 2 ])

// { a: 2, b: 4, c: 6 }


ECMAScript (ECMA-262)
The definition of 'Object.fromEntries' in that specification.

Browser compatibility

ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
fromEntriesChrome Full support 73Edge Full support 79Firefox Full support 63IE No support NoOpera Full support 60Safari Full support 12.1WebView Android Full support 73Chrome Android Full support 73Firefox Android Full support 63Opera Android No support NoSafari iOS Full support 12.2Samsung Internet Android No support Nonodejs Full support 12.0.0


Full support
Full support
No support
No support

See also