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JavaScript Map size Property - GeeksforGeeks

Last Updated : 23 Jul, 2025

Map is a collection of elements where each element is stored as a Key, value pair. The Map.size property returns the number of key, and value pairs stored in a map.

mapName.size

An integer representing the number of key, value pairs stored in a map.

The below examples illustrate the Map.size property.

Example 1:

let GFGmap = new Map();

// Adding key, value pairs to the map
GFGmap.set('1', 'Apple');
GFGmap.set('2', 'Banana');
GFGmap.set('3', 'Mango');

// Printing number of key, value
// pairs stored in the map
console.log(GFGmap.size);

Output:

3

Example 2:

let GFGmap = new Map();

// Adding key, value pairs to the map
GFGmap.set('a', 'Apple');
GFGmap.set('b', 'Ball');
GFGmap.set('c', 'Cat');
GFGmap.set('d', 'Dog');

// Printing number of key, value
// pairs stored in the map
console.log(GFGmap.size);

Output:

4

• Google Chrome 38.0
• Microsoft Edge 12.0
• Firefox 13.0
• Internet Explorer 11.0
• Opera 25.0
• Safari 8.0

We have a complete list of Javascript Map methods, to check those please go through this JavaScript Map Complete Reference article.

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