Make JSON readable, check it for errors, or minify it.
Format
Last reviewed by the OnlineToolPro team
Paste JSON to format it with clean indentation, check that it's valid (errors show the line and column), sort keys alphabetically or minify it to one line.
How it works
3 simple steps. No experience needed.
Good to know
The most frequent problems are trailing commas after the last item, single quotes instead of double quotes, keys without quotes and comments. The error message shows the line and column so you can jump straight to the problem.
Choose 2 spaces, 4 spaces or tabs for readable output, or minify to remove all whitespace for the smallest payload. Sorting keys alphabetically makes two JSON files much easier to compare.
FAQ
Yes. The JSON is parsed in your browser and never sent anywhere.
No — those aren't valid JSON, so the tool points them out.
Format both with “Sort keys alphabetically” turned on, then paste them into the text compare tool to see exactly what changed.
Step-by-step help for getting more out of the json formatter.
Other tools you might find useful next.
Format, convert and check code and data. 9 free tools.