Paste JSON, format it, minify it, or validate syntax instantly. Runs entirely in your browser.
How to Use the JSON Formatter
Working with JSON is a daily task for developers, API users, and anyone who handles structured data. This tool makes it painless to format, compress, or check your JSON without installing anything.
Format
Paste your compact or messy JSON and click Format. The tool parses it and outputs properly indented, human-readable JSON with two-space indentation.
Minify
Click Minify to strip all whitespace and produce the shortest valid JSON string. Useful when you need to reduce payload size for APIs or storage.
Validate
Click Validate to check if your JSON is syntactically correct. If it is not, you will see the exact error message and the character position where the issue was found.
Why use a client-side tool?
All processing happens in your browser — no data is uploaded to any server. This means your API keys, configuration files, and sensitive data stay completely private.
Frequently asked questions
What is a JSON formatter?
A JSON formatter takes compact or messy JSON and pretty-prints it with proper indentation, line breaks, and spacing so it is easy to read and debug.
What does JSON minify do?
JSON minification removes all unnecessary whitespace, newlines, and indentation to produce the smallest possible JSON string while preserving the data.
How do I validate JSON syntax?
Click the Validate button. The tool attempts to parse your input. If it fails, it shows the exact error message and the character position where the problem occurs.
Does my JSON leave my browser?
No. All formatting, minifying, and validating happens locally in your browser using JavaScript. No data is sent to any server.
This tool processes JSON locally in your browser. No data is transmitted to any server. Always verify critical JSON configurations independently.