JSON Formatter

How to use

Paste JSON text or drag a .json file into the input area. Click Format to beautify with proper indentation and line breaks, Minify to compress all whitespace into a single line, or Validate to check for syntax errors — the validator shows the exact line and column where each error occurs. Toggle 'Sort keys' to alphabetically sort all object keys throughout the entire JSON tree. Copy the result to clipboard or download as a .json file. The tool handles nested objects, arrays, strings with special characters, and Unicode text without any issues.

Why use this tool

JSON formatting is a daily task for web developers, API integrators, and data engineers who work with configuration files and REST APIs. This tool handles everything in your browser — no data ever leaves your device, making it safe for sensitive payloads. Use it to debug API responses that are hard to read when minified, clean up config files before committing them to version control, or prepare JSON for documentation and code reviews. The validator helps you catch syntax errors before they reach production. Minification is useful when you need to reduce request payload sizes for performance-sensitive applications.

FAQ

Is the JSON formatter free and secure?

Yes. Completely free, no sign-up required. Your JSON is processed locally in the browser — nothing is sent to our servers.

What is JSON formatting (beautify)?

Formatting adds consistent indentation and line breaks to make JSON human-readable. For example, {"a":1,"b":2} becomes a multi-line structure with 2-space indent. Useful for reading complex nested objects.

What does 'Sort keys' do?

It recursively sorts all object keys alphabetically throughout the entire JSON tree. Helpful for comparing two JSON objects or ensuring consistent key order in configuration files.

How do I fix a JSON syntax error?

Click Validate — the tool highlights the first error with its line and column number. Common issues: trailing commas (not allowed in JSON), single quotes instead of double quotes, missing commas between items, or unquoted keys.

What is JSON minification?

Minification removes all whitespace, newlines, and indentation to produce the smallest possible JSON string. Use it to reduce payload size for API requests or when storing JSON in databases.

Is there a file size limit?

No hard limit. Processing is done in the browser, so very large files (>10MB) may be slow depending on your device. For most API responses and config files there is no noticeable delay.