Format and validate JSON data
Click JSON → YAML to convert the current input, or YAML → JSON to parse YAML input back into formatted JSON.
Supports: $ root, .key, [n], [*], [0,2], [1:3], ..key (recursive descent).
Provide valid JSON above to query.
A JSON formatter (also called a JSON beautifier or pretty-printer) takes a compact or malformed JSON string and outputs a properly indented, spec-compliant version. It's the first thing every developer reaches for when an API response is hard to read, a config file is broken, or a log entry is minified. This tool validates strictly, reports errors with location hints, and runs fully in the browser.
The JSON spec doesn't allow trailing commas, single-quoted strings, unquoted keys, or // comments. If your file uses any of those, it's JSON5/JSONC, not strict JSON.
Strips all whitespace, producing the smallest valid representation. Useful before embedding JSON in a query parameter or minimizing payload size.
Up to several MB comfortably. For multi-hundred-MB logs, use a streaming parser instead — browsers can't format that much text interactively.
Use a dedicated JSONPath tool for query extraction. This formatter focuses on validation and pretty-printing.
No. Parsing happens in your browser — nothing leaves your machine.
