Does this tool validate JSON?
Yes. It checks JSON syntax before producing output and reports an available line and column; it does not validate against a JSON Schema.
{ }
Developer
JSON Formatter
Paste JSON or choose a local .json file, validate it with clear error locations, then format with 2 spaces, 4 spaces, or tabs, minify, copy, or download.
4 MB file and 1,000,000 Unicode character maximum · processed locally
Used for formatting only; minifying removes unnecessary whitespace.
Output
Your formatted or minified result will appear here.
Three simple steps
How to use JSON Formatter
- 01
Paste JSON or choose a local .json file.
- 02
Select indentation, then Format or Minify.
- 03
Copy or download the validated JSON.
Privacy first
Tool data and site requests stay separate
Tool input and results are processed in temporary state for the current page. The TabPebble application does not send them to a server, write them to a database, or create processing history. Pages and code still load through ordinary network requests. Your browser may restore a tab, while downloads and clipboard copies remain on the device until you remove or replace them.
- No tool-task upload
- No account
- No processing history
FAQ
Frequently asked questions
How can I format JSON without uploading it?
Paste JSON or select a local .json file, choose indentation, then select Format. Parsing and formatting run in your browser; the TabPebble application does not send the JSON to a server. Page and code downloads still use network requests.
Can I format large JSON files or fix invalid JSON automatically?
Local text files are limited to 4 MB, and input is limited to one million Unicode characters. Invalid JSON produces an error instead of a silently repaired result. Syntax validation does not check a JSON Schema.
Is this tool free?
Yes. Core tools are free to use and do not require an account.
Does tool input go to a server?
No. The TabPebble application performs the tool task in your browser and does not put input into site requests; ordinary page and code requests still reach the hosting service.