JSON Formatter
Turn dense JSON into readable, properly indented data.
Paste valid JSON. Results update as you type. Up to 1,000,000 characters.
How to use JSON formatter
- Paste valid JSON into the editor.
- Choose two spaces, four spaces or a compact result. Formatting updates as you type.
- Copy the formatted JSON or download a JSON file.
A clearer view of your JSON
Paste JSON to validate it and choose two spaces, four spaces or a compact result. Copy the output or download a JSON file.
Formatting without executing
Your input is parsed as data. It is never executed as code. Large integers outside JavaScript’s safe range are rejected; quote identifiers that must remain exact.
Working with json formatter
A JSON formatter turns compact structured data into readable indentation or removes optional whitespace for a compact representation. The result must still be valid JSON. Formatting is useful for inspection and debugging, but it does not check a business rule or schema. This preview rejects unsafe numeric values instead of silently presenting a rounded identifier as exact.
A simple example
{"name":"Ada","score":98} → a readable JSON object with your chosen indentation
Common questions
Does this accept comments or trailing commas?
No. This preview parses standard JSON, not JSON5 or JavaScript object literals. Comments and trailing commas produce an error.
Can large numeric IDs lose precision?
Numbers beyond JavaScript’s safe integer range are rejected. Put identifiers that must remain exact in quoted strings before formatting.
Continue your workflow: JSON validator, JSON to CSV, JSON to typescript.