JSON Formatter
Format, validate and minify JSON in your browser. Nothing is uploaded.
Input
0 charsOutput
Top-level keys
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Max depth
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Formula & explanation
Paste any JSON and get a readable, indented version. The tool validates the syntax and points to the error if the JSON is invalid.
Choose Minified to remove whitespace and get the smallest possible output.
Example
Indentation2
Output size0 KB
Top-level keys3
Is my JSON sent to a server?
No. Parsing and formatting happen entirely in your browser.
Why does it say invalid JSON?
Common causes: trailing commas, single quotes instead of double quotes, or unquoted keys.
Does it keep the key order?
Yes, unless you enable 'Sort keys alphabetically'.