JSON Formatter
Format, validate, and inspect JSON in your browser.
Decode URL query parameters while preserving repeated keys.
Your result will appear here.
Enter your input, then run the tool.URL or query string: https://example.com/?name=Sam&tag=one&tag=two
Use the labeled units and valid url or query string. The Example button supplies a reproducible starting input.
Format, validate, and inspect JSON in your browser.
Inspect token headers and payloads without uploading them.
Create cryptographically random version 4 identifiers.