Free dev tools

JSON tools

Browser-only utilities that get a single job done well. Each tool also lets you save the result as a versioned blob with a shareable URL — free, no sign-up needed.

JSON Formatter
Pretty-print and validate JSON with two-space indentation.
JSON Validator
Check JSON syntax against RFC 8259 with a precise error pointer.
JSON Minifier
Strip non-significant whitespace for transport or storage.
JSON Diff
Semantic, key-aware diff between two JSON values or blob versions.