Plain-English messages with the exact line, column, and a code excerpt, instead of a cryptic “Unexpected token”.
Developer
JSON Formatter
Paste JSON to validate it instantly, then beautify, minify, sort keys, or explore it as a tree. Errors come with the exact line and column.
JSON inputPaste, type, or drop a .json file
Paste JSON to format and validate it
ResultFormatted JSON appears here
Nothing to show yet
Your formatted JSON, tree view, and stats appear as soon as you add some.
What it handles
Everything you need to read and clean up JSON.
Built for the moments when you are staring at a wall of minified API output or a config file that will not parse.
Repair trailing commas, single quotes, unquoted keys, comments, and missing commas in one click.
Switch to the tree view to collapse sections, spot nesting, and copy the path to any value.
Frequently asked questions
Does this tool send my JSON to a server?
No. Everything is processed in your browser, so the data you paste is never uploaded, logged, or stored.
Will large numbers lose precision?
No. Numbers are kept exactly as written, so IDs like 12345678901234567890 are not rounded the way JavaScript would round them.
What does “Fix issues” repair?
Trailing commas, missing commas, single or curly quotes, unquoted property names, comments, and Python-style True, False, and None values. It shows what it changed, and you can undo it.
How large a file can I format?
Files up to 10 MB can be imported. Very large results are shown without syntax colors to keep the page responsive.