JavaScript (ES2026) reference · Object Methods

JavaScript Object.fromEntries() Method

Build an object from an iterable of [key, value] pairs, such as an array or a Map. The opposite of Object.entries().

JavaScript (ES2026) Since ES2019

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Syntax

Object.fromEntries(iterable)

Parameters

Parameter	Description
`iterable`	Pairs such as `[["a", 1]]` or a `Map`.

Return value

A new object.

Examples

From pairs or a MapTry it yourself

console.log(Object.fromEntries([["a", 1], ["b", 2]]));
console.log(Object.fromEntries(new Map([["x", true]])));

Output

{ a: 1, b: 2 }
{ x: true }

Map over an object's valuesTry it yourself

const prices = { tea: 3, cake: 4 };
const withTax = Object.fromEntries(Object.entries(prices).map(([k, v]) => [k, Math.round(v * 1.2 * 100) / 100]));
console.log(withTax);