JSON Formatter, Validator & Viewer | Online JSON Editor

What is JSON and Why is it So Strict?

JSON (JavaScript Object Notation) has become the de facto standard for transmitting data between a server and a web application, and for storing configuration data. While powerful, it has a very strict syntax: a single missing comma or a quote in the wrong place can make the entire data structure invalid. This is why a validator and formatter is an essential tool for any developer working with APIs.

Key Features of Our JSON Tool

This tool is more than just a formatter; it's a complete JSON toolkit designed to save you from common syntax headaches.

• Instant Validation: The moment you paste your code, our tool checks if it's valid JSON. It will immediately alert you to syntax errors, helping you find them quickly.
• Beautify & Format: Transforms a compact, unreadable JSON string into a beautifully indented, hierarchical tree structure that's easy to read and understand.
• Sort Keys: Optionally sort the keys in your JSON objects alphabetically. This is incredibly useful for comparing two different JSON structures to see what has changed.
• Minify & Compress: Removes all whitespace to prepare your JSON data for transmission over a network, minimizing bandwidth usage.
• Completely Secure: Whether it's API keys or user data, your JSON is safe. All validation and formatting happens on your machine.

Practical Use Case: Debugging API Responses

A common task for developers is inspecting the data returned from an API. This data is often sent in a minified, single-line format. By pasting the API response into this tool, you can instantly validate its integrity and view it in a clean, formatted way to understand its structure and find the data you need.