JSON Formatter & Validator
Format, validate, beautify, or minify JSON data. Real-time validation.
How to Format and Validate JSON Online
Turn minified or messy JSON into clean, readable output — and catch syntax errors instantly.
Paste Your JSON
Copy your JSON string from an API response, config file, or log output and paste it into the input text area.
Format or Minify
Click Format to add proper indentation and line breaks for readability. Click Minify to collapse it back to a single line for production use.
Validate and Fix Errors
If the JSON contains a syntax error, the validator highlights the problem and points to the exact location so you can fix it quickly.
Copy the Result
Click Copy to copy the formatted or minified JSON to your clipboard — ready to paste into your code, documentation, or API request.
Why Use a JSON Formatter?
Readable JSON is the difference between a 30-second fix and a 30-minute debugging session.
Instantly Readable
One-line minified JSON from an API response is unreadable. Formatting adds indentation and newlines that reveal the data structure at a glance.
Catch Syntax Errors
Trailing commas, missing brackets, or unquoted keys cause silent failures. The validator catches these errors and pinpoints their location immediately.
Minify for Production
Remove all whitespace from JSON to reduce payload size before embedding it in code, config files, or API requests.
100% Private
Your JSON — which may contain API keys, credentials, or sensitive data — is processed entirely in your browser and never sent to any server.
Frequently Asked Questions
Formatting adds indentation and newlines to make JSON human-readable but doesn't change the data. Validating checks whether the JSON is syntactically correct according to the JSON specification (RFC 8259). This tool does both simultaneously.
Yes, but very large files (several MB) may slow down the browser due to the DOM rendering of formatted output. For files over 10MB, consider using a local tool like jq or a code editor with JSON support.
Yes — after formatting, copy the JSON and paste it into our Base64 Encoder to encode it for use in data URIs, API headers, or configuration values.