Format or Minify JSON Instantly
Paste any JSON and pretty-print it with readable indentation, or minify it down to a single compact line. If the JSON is invalid, you'll see a clear error message instead of a silent failure. Everything runs in your browser — nothing is sent to a server.
🧩 Great For
- Making a minified API response readable for debugging
- Shrinking a config file's JSON before pasting it somewhere size-limited
- Checking whether a JSON string is valid before using it in code
- Quickly reviewing a JSON payload's structure
📋 How to Use
- Paste your JSON into the box
- Press "Pretty print" to format it, or "Minify" to compact it
- If it's invalid, an error message explains what's wrong
- Press "Copy result" to copy the output
Frequently Asked Questions
What happens if my JSON is invalid?
An error message appears showing what went wrong and roughly where in the text the problem is, based on your browser's JSON parser — no formatting is applied until the JSON is valid.
What's the difference between Pretty print and Minify?
Pretty print adds line breaks and indentation to make JSON easy to read. Minify removes all unnecessary whitespace to make it as compact as possible — useful when size matters.
Is my JSON data sent anywhere?
No. Parsing and formatting happen entirely in your browser using its built-in JSON support — nothing is saved or sent to a server.