JavaScript Map size Property Last Updated : 23 Jul, 2025 Comments Improve Suggest changes Like Article Like Report 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.SyntaxmapName.sizeReturn ValueAn integer representing the number of key, value pairs stored in a map.The below examples illustrate the Map.size property.Example 1: JavaScript 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:3Example 2: JavaScript 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:4Supported BrowsersGoogle Chrome 38.0Microsoft Edge 12.0Firefox 13.0Internet Explorer 11.0Opera 25.0Safari 8.0We have a complete list of Javascript Map methods, to check those please go through this JavaScript Map Complete Reference article. Comment A abhinavjain194 Follow Improve A abhinavjain194 Follow Improve Article Tags : JavaScript Web Technologies javascript-math JavaScript-Properties Explore JavaScript BasicsIntroduction to JavaScript4 min readVariables and Datatypes in JavaScript6 min readJavaScript Operators5 min readControl Statements in JavaScript4 min readArray & StringJavaScript Arrays7 min readJavaScript Array Methods7 min readJavaScript Strings5 min readJavaScript String Methods9 min readFunction & ObjectFunctions in JavaScript5 min readJavaScript Function Expression3 min readFunction Overloading in JavaScript4 min readObjects in JavaScript4 min readJavaScript Object Constructors4 min readOOPObject Oriented Programming in JavaScript3 min readClasses and Objects in JavaScript4 min readWhat Are Access Modifiers In JavaScript ?5 min readJavaScript Constructor Method7 min readAsynchronous JavaScriptAsynchronous JavaScript2 min readJavaScript Callbacks4 min readJavaScript Promise4 min readEvent Loop in JavaScript4 min readAsync and Await in JavaScript2 min readException HandlingJavascript Error and Exceptional Handling6 min readJavaScript Errors Throw and Try to Catch2 min readHow to create custom errors in JavaScript ?2 min readJavaScript TypeError - Invalid Array.prototype.sort argument1 min readDOMHTML DOM (Document Object Model)9 min readHow to select DOM Elements in JavaScript ?3 min readJavaScript Custom Events4 min readJavaScript addEventListener() with Examples9 min readAdvanced TopicsClosure in JavaScript4 min readJavaScript Hoisting6 min readScope of Variables in JavaScript3 min readJavaScript Higher Order Functions7 min readDebugging in JavaScript4 min read Like