JSON Formatter & Validator

Parse, validate, beautify, and minify your JSON data. The ultimate debugging tool for developers and SEOs.

Input JSON

Result / Error

Waiting for input... Size: 0 B

What is JSON and Why Do You Need a Formatter?

JSON (JavaScript Object Notation) is a lightweight data-interchange format that is easy for humans to read and write, and easy for machines to parse and generate. It has become the standard for data exchange on the web, replacing XML in most modern applications, APIs, and configuration files.

However, raw JSON data returned from an API or server is often "minified"—meaning all unnecessary whitespace, newlines, and indentation have been removed to save bandwidth. While efficient for computers, this makes it nearly impossible for humans to read or debug. Our JSON Formatter & Validator solves this problem by parsing the messy raw string and formatting it into a structured, readable tree.

Key Features of This Tool

JSON Beautifier: Transforms minified, unreadable JSON strings into a clean, indented format (Pretty Print).
JSON Validator: Instantly checks your code for syntax errors. If you missed a comma or a closing bracket, our tool tells you exactly where the error is.
JSON Minifier: Compresses your JSON by removing whitespace, making the file size smaller for production use.
Schema Debugging: Perfect for SEOs implementing JSON-LD Schema markup. Validate your schema before adding it to your website.

Common JSON Syntax Errors Explained

Even experienced developers make mistakes when writing JSON manually. Here are the most common errors our validator catches:

1. Trailing Commas

Unlike JavaScript objects, JSON does not allow a comma after the last element in an object or array. This is the #1 cause of parsing errors.

INVALID: { "name": "John", "age": 30, }
VALID: { "name": "John", "age": 30 }

2. Single Quotes

The JSON standard strictly requires **double quotes** for both keys and string values. Single quotes cause syntax errors.

INVALID: { 'name': 'John' }
VALID: { "name": "John" }

3. Unquoted Keys

In JavaScript, you can write { name: "John" }. In JSON, the key must be a string enclosed in double quotes.

INVALID: { name: "John" }
VALID: { "name": "John" }

JSON in SEO: The Role of JSON-LD

For Search Engine Optimization professionals, JSON is critical because of **JSON-LD (JavaScript Object Notation for Linked Data)**. This is the format recommended by Google for implementing Structured Data (Schema Markup).

Structured data helps search engines understand the content of your page, enabling **Rich Snippets** like star ratings, recipe cards, event times, and product prices in search results. A single syntax error in your JSON-LD script can cause Google to ignore your markup entirely.

Before pasting schema code into your website header or Google Tag Manager, always run it through our **JSON Validator** to ensure it is syntactically correct.

Minification vs. Beautification

When should you use which?

Use Beautification (Pretty Print) when you are developing, debugging, or analyzing data. It uses indentation (usually 2 or 4 spaces) to show the hierarchy of data clearly.
Use Minification when you are deploying code to a live server. By removing whitespace, you reduce the payload size, which improves page load speed—a vital factor for SEO and user experience.

How to Use This Tool

Paste or Upload: Copy your JSON string into the left input panel, or click "Upload File" to load a .json file from your computer.
Validate: The tool automatically checks for errors as you type. If an error is found, the status bar turns red and tells you the line number.
Format: Click the "Beautify" button to format the code with proper indentation.
Minify: Click "Minify" to compress the code into a single line.
Download: Once you are happy with the result, click "Copy" or "Download" to save your clean JSON file.

Privacy & Security

We take data privacy seriously. Unlike many other online tools, our JSON Formatter processes your data **entirely in your browser** using JavaScript. Your data is never sent to our servers, ensuring that your API keys, configuration files, and private data remain 100% secure on your own device.