Free JSON Formatter and Validator
Format, minify and validate JSON online. Your data stays in your browser and is never uploaded.
About this tool
Paste JSON to pretty-print it with two-space indentation, minify it into one line, or check whether it is valid. Errors are reported with the message from the browser's JSON parser, which helps you find missing commas and quotes.
How to use JSON Formatter in 3 Simple Steps
Paste your JSON
Paste any JSON text into the box.
Format or minify
Click Format for readable output, or Minify to remove whitespace.
Fix errors and copy
If the JSON is invalid, read the message, fix it, then copy the result.
Why ForgePDF JSON Formatter is Completely Private
🔒 Parsing uses your browser's built-in JSON engine. API responses, configs and tokens you paste are never sent to a server.
Frequently Asked Questions
Does it accept comments or trailing commas?
No. Standard JSON does not allow them, so they are reported as errors.
Is there a size limit?
There is no limit set by ForgePDF. Very large files are limited only by your device memory.