JSON Formatter and Validator
Paste your JSON and get it formatted, validated or minified, with any error pinpointed.
- Never leaves your device
- No sign-up
Quick answer: To format JSON, paste it into the box: if it's valid, it appears indented and ready to copy. If there's an error, the message shows the problem and its position. Use Minify to strip whitespace and Sort keys to compare objects.
How to do it in 3 steps
- 1Paste the JSON.
- 2Choose format or minify.
- 3Copy the result.
Why use Pronto Arquivo
Instant validation
Shows the error and its exact position.
Indentation
2 spaces, 4 spaces or tabs.
Sort keys
Makes API responses easier to compare.
Private
API data and tokens never leave your browser.
Guides
Common errors
A trailing comma after the last item, single quotes instead of double quotes and unquoted keys are all invalid in JSON.
Frequently asked questions
How do I validate JSON?
Paste it into the box: you'll see Valid JSON or the error message.
What does minifying JSON mean?
Removing spaces and line breaks to make the file smaller.
Does it handle large JSON?
Yes, limited only by your browser's memory.
Is my data uploaded?
No. Everything is processed in your browser.
