Format JSON, Python dicts, and any data structure
This is not just a JSON formatter. It's a universal data structure beautifier — paste JSON, a Python dict, a nested list, a tuple, a set, or any combination, and it will render each structure with proper indentation, syntax highlighting, and collapsible nodes. No strict rules, no crashes.
- Format any data structure — JSON objects, Python dicts, nested lists, tuples
(), sets {}, or a mix of all of the above in a single paste.
- Python-native syntax —
None, True, False, single-quoted strings, numeric keys, and expressions like datetime.now() are all parsed without errors.
- Syntax highlighting — Brackets colored by nesting depth; strings, numbers, booleans, and
null each get a distinct color, making deep structures easy to scan.
- Collapsible nodes — Click ▾ to collapse any object or array, just like browser DevTools. Ideal for navigating large nested data.
- Lenient parser — Trailing commas, missing commas,
# and // comments, bare words — all handled gracefully. Invalid chunks are kept as raw text instead of crashing the whole output.
- Multiple structures in one paste — Paste a log dump or debug output with several dicts or objects; each is formatted as a separate labeled section.
- Validate JSON — Enable strict mode to validate against the JSON specification and catch syntax errors immediately.
- Minify — Strip whitespace into a single compact line, perfect for production payloads or API calls.
- No backend, no signup — Everything runs locally in your browser. Your data never leaves your machine.