JSON Formatter & Validator
Beautify, minify and validate JSON with clear error messages.
Converters & Dev
JSON → PRETTY
Loading tool…
Files are processed in your browser. Nothing is uploaded to a server.
JSON is everywhere — APIs, config files, exports — but it is unforgiving about syntax. A single missing comma breaks the whole document. This tool pretty-prints JSON so it is readable, minifies it for production, and validates it with a precise error pointing to what went wrong.
How to format JSON
- Paste your JSON into the editor.
- Click Beautify to indent it, or Minify to compact it.
- If it is invalid, read the error message describing the problem.
- Copy the cleaned output.
Beautify vs. minify
| Action | Result | Use when |
|---|---|---|
| Beautify | Indented, multi-line | Reading or debugging |
| Minify | One compact line | Sending over the network |
| Validate | Pass / fail + reason | Checking before you ship |
Formatter features
- Configurable indent (2 or 4 spaces, or tabs).
- Minify mode to strip all unnecessary whitespace.
- Helpful validation errors instead of a silent failure.
- Runs entirely in your browser — paste sensitive data safely.
Frequently asked questions
Why does my JSON fail to validate?
The usual culprits are trailing commas, single quotes instead of double quotes, or unquoted keys. The error message points to the exact spot.
Does minifying change the data?
No. It only removes whitespace; the values and structure are identical, just smaller.
Is my JSON sent to a server?
No, parsing and formatting happen locally, which is important when the data is private.