Free Online JSON Formatter and Validator
Our JSON formatter is a free, browser-based tool that helps developers format, validate, and beautify JSON data instantly. Whether you're debugging API responses, editing configuration files, or working with data exports, this tool makes JSON readable and error-free.
Key Features
- Format & Beautify: Transform minified JSON into readable, properly indented code with customizable spacing (2 spaces, 4 spaces, or tabs).
- Validate JSON: Instantly check if your JSON is valid with detailed error messages showing exact line and column numbers.
- Minify: Compress JSON by removing all whitespace for smaller file sizes and faster transmission.
- Tree View: Visualize JSON structure with an interactive, collapsible tree showing paths to each node.
- Convert Formats: Transform JSON to CSV for spreadsheets or YAML for configuration files.
- Privacy First: All processing happens locally in your browser. Your data never leaves your device.
How to Use the JSON Formatter
- Paste or Upload: Paste your JSON into the input box, drag and drop a .json file, or click "Upload File".
- Format: Click "Format" to beautify your JSON with proper indentation, or "Minify" to compress it.
- Validate: Click "Validate" to check for syntax errors. Errors show the exact location of the problem.
- Export: Copy the result to clipboard or download as a .json file.
What is JSON?
JSON (JavaScript Object Notation) is a lightweight, text-based data interchange format. It's language-independent but uses conventions familiar to programmers of the C-family of languages. JSON is built on two structures:
- Objects: A collection of key/value pairs enclosed in curly braces
{ } - Arrays: An ordered list of values enclosed in square brackets
[ ]
JSON is widely used for REST APIs, configuration files, data storage, and communication between web servers and browsers.
Frequently Asked Questions
What is JSON?
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 is widely used for APIs, configuration files, and data storage.
How do I format JSON online?
Simply paste your JSON into the input box and click "Format". The tool will automatically beautify your JSON with proper indentation. You can choose between 2 spaces, 4 spaces, or tabs for indentation.
How do I validate JSON?
Paste your JSON and click "Validate". If the JSON is invalid, you'll see an error message with the exact line and column where the error occurred, helping you quickly fix syntax issues.
Can I convert JSON to CSV?
Yes! If your JSON contains an array of objects, click "CSV" to convert it to CSV format. This is useful for importing JSON data into spreadsheet applications like Excel or Google Sheets.
Is this JSON formatter free?
Yes, this JSON formatter is completely free with no signup required. All processing happens in your browser, so your data never leaves your device.
What are common JSON syntax errors?
Common JSON errors include: missing or extra commas, unquoted keys, single quotes instead of double quotes, trailing commas after the last item, and unescaped special characters in strings.
Is my data secure?
Absolutely. This tool runs entirely in your browser using JavaScript. Your JSON data is never sent to any server, ensuring complete privacy and security.