Format, validate, and beautify JSON online instantly. Interactive tree view, syntax highlighting, search, minify, and validation. Free JSON formatter with no sign-up required.
- Pretty-print and minify JSON with one click
- Interactive tree view with expand/collapse and search
- Syntax validation with clear error messages and line numbers
- Smart detection of URLs, dates, timestamps, and UUIDs in values
- Copy, download, and share formatted output
Debug API responses, inspect config files, or clean minified JSON without installing anything. The tree view makes nested structures easy to navigate, and validation catches typos and invalid syntax before you ship.
Try JSON Formatter at Spoold →
Spoold is a free developer toolbox that detects what you paste and opens the right tool.
- No sign-up – Use every tool without an account.
- Runs in your browser – Your data stays on your device; we don’t store or log your input.
- Paste and go – Paste JSON, HTML, JWT, curl, Base64, or any text on the homepage and Spoold suggests the right tool.
- One place for many tools – JSON formatter, JWT decoder, Base64, UUID generator, regex tester, curl-to-code, and more.