Formatting Dynamic JSON array JavaScript Last Updated : 18 Apr, 2024 Comments Improve Suggest changes Like Article Like Report Formatting a Dynamic JSON array is important because it organizes complex data structures, making them easier to read, manipulate, and communicate within applications and APIs. We will explore approaches to formatting dynamic JSON arrays in JavaScript. Below are the approaches to format dynamic JSON arrays in JavaScript: Table of Content Using for...in LoopUsing Array.map()Using for...in LoopIn this approach, we are using a for...in loop to iterate over the elements in the jsonData array of objects. During each iteration, we extract the properties name, role, and experience from each object and push them into the res.temp array, resulting in a formatted JSON structure for the data. Example: The below example uses for...in Loop to format dynamic JSON array in JavaScript. JavaScript let jsonData = [{ name: "Gaurav", role: "Developer", experience: 5 }, { name: "Saurav", role: "Designer", experience: 3 }, { name: "Ravi", role: "Manager", experience: 8 }, ]; let res = { temp: [] }; for (let i in jsonData) { let item = jsonData[i]; res.temp.push({ "name": item.name, "role": item.role, "experience": item.experience }); } console.log(JSON.stringify(res, null, 2)); Output{ "temp": [ { "name": "Gaurav", "role": "Developer", "experience": 5 }, { "name": "Saurav", "role": "Designer", "experience": 3 }, { "na...Using Array.map()In this approach, we are using Array.map() to iterate over the elements in the jsonData array of objects. For each item in the array, we extract the properties name, role, and experience, and push them into the res.gfg array, resulting in a formatted JSON structure for the data. Example: The below example uses Array.prototype.map() to format dynamic JSON array in JavaScript. JavaScript let jsonData = [{ name: "Gaurav", role: "Developer", experience: 5 }, { name: "Saurav", role: "Designer", experience: 3 }, { name: "Ravi", role: "Manager", experience: 8 }, ]; let res = { gfg: [] }; jsonData.map(function (item) { res.gfg.push({ "name": item.name, "role": item.role, "experience": item.experience }); }); console.log(JSON.stringify(res, null, 2)); Output{ "gfg": [ { "name": "Gaurav", "role": "Developer", "experience": 5 }, { "name": "Saurav", "role": "Designer", "experience": 3 }, { "nam... Comment More infoAdvertise with us Next Article Formatting Dynamic JSON array JavaScript G gauravggeeksforgeeks Follow Improve Article Tags : JavaScript Web Technologies JSON Similar Reads How Dynamic Arrays Work in JavaScript ? A dynamic array, also known as a resizable array or a dynamic array list, is a data structure that allows its size to be changed dynamically during program execution. 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