Free JSON Formatter
Paste or type JSON and instantly format, validate, and explore it with a powerful tree view and code editor. Powered by jsoneditor, an open-source JSON editor with over 12,000 GitHub stars. All processing happens locally in your browser — no signup, no server, no data sent anywhere.
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Why Use a JSON Formatter?
JSON is the universal data format for APIs, configuration files, and data exchange — but raw JSON from an API response or a minified file is nearly impossible to read. This free JSON formatter instantly beautifies, validates, and lets you explore JSON data with a tree view, all running locally in your browser with no data sent anywhere.
Whether you are debugging an API response, reviewing a config file, or building a payload to send to a service, having a fast, private JSON tool eliminates the friction of pasting sensitive data into third-party websites. The formatter catches syntax errors in real-time and points you to the exact line and character where the issue is, saving time compared to hunting through raw text.
The tool is powered by jsoneditor, an open-source JSON editor with over 12,000 GitHub stars and 304,000 weekly npm downloads. It provides both a code view with syntax highlighting and a tree view for navigating deeply nested structures — the same component used in production by thousands of developer tools and internal dashboards worldwide.
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How It Works
Paste or type your JSON into the editor.
Instantly see formatted output with syntax highlighting and validation.
Copy the formatted JSON or explore it in tree view.
Key Features
Privacy & Trust
Use Cases
Frequently Asked Questions
Limitations
- Very large JSON files may slow down the browser
- Does not support JSON5 or JSONC formats
- Tree view may be slow for deeply nested structures
