How to use a Custom Function for JSON Stringify In Javascript

Q: How to use a Custom Function for JSON Stringify In Javascript

In this approach, we’re using a custom function approach2Fn to recursively stringify an array of objects, handling objects, arrays, and primitive values to construct a valid JSON string representation. The function checks the type of each item in the data and applies the stringify logic accordingly.

Using JSON.stringify with a Replacer Function

In this approach, we’re using a custom function approach2Fn to recursively stringify an array of objects, handling objects, arrays, and primitive values to construct a valid JSON string representation. The function checks the type of each item in the data and applies the stringify logic accordingly.

Syntax:

function customStringify(data) {
 // code
  return jsonString;
}

Example: The below example uses Custom Function for JSON Stringify to json stringify an array of objects in javascript.

JavaScript

const data = [
    {
        language: 'JavaScript',
        category: 'Web Development'
    },
    {
        language: 'Python',
        category: 'Data Science'
    },
    {
        language: 'Java',
        category: 'Software Development'
    }
];
const res = approach2Fn(data);
console.log(res);

function approach2Fn(data) {
    if (Array.isArray(data)) {
        const sArr = data.map
            (item => approach2Fn(item));
        return `[${sArr.join(',')}]`;
    } else if (typeof data === 'object' 
        && data !== null) {
        const sObj = Object.entries(data)
            .map(([key, value]) => 
                `"${key}":${approach2Fn(value)}`)
            .join(',');
        return `{${sObj}}`;
    } else {
        return JSON.stringify(data);
    }
}

Output:

[
    {"language":"JAVASCRIPT","category":"WEB DEVELOPMENT"},
    {"language":"PYTHON","category":"DATA SCIENCE"},
    {"language":"JAVA","category":"SOFTWARE DEVELOPMENT"}
]

How to JSON Stringify an Array of Objects in JavaScript ?

In JavaScript, the array of objects can be JSON stringified for easy data interchange and storage, enabling handling and transmission of structured data. The below approaches can be utilized to JSON stringify an array of objects.

Table of Content