Small JSON example
A compact object can be expanded into readable JSON.
{"name":"ProntoUso","active":true}JSON, YAML & XML Formatter
Validate and format JSON, convert common YAML mappings to JSON or back, and format or minify XML. Processing runs locally in your browser.
Runs locally in your browser. This tool does not upload your input.
Or drop a .json file or choose a file.json · up to 2.0 MB. Read in your browser, never uploaded.
Output
Paste JSON to begin.
What is a JSON, YAML & XML Formatter?
Format or minify JSON, convert between JSON and YAML, and clean up XML formatting locally in your browser.
Format JSON
Formatting makes JSON easier to read by adding line breaks and two-space indentation. It does not change the data structure.
Minify JSON
Minifying removes unnecessary whitespace after parsing, which is useful when you need a compact payload or want to normalize JSON output.
Validate JSON
The tool validates by calling JSON.parse. If the input is invalid, the browser parse error is shown and no formatted output is produced.
- Property names must use double quotes.
- Strings must use double quotes.
- Trailing commas are not valid JSON.
How to use it
- Choose the JSON, YAML, or XML tab for the format you are working with.
- Paste text into the input editor or load a matching text file.
- Choose Format, Minify, or the YAML conversion direction you need.
- Use Copy when the output field contains the result you want.
Formatting notes
The formatter parses input before writing output. JSON keeps the same data structure, while YAML and XML may come back with cleaner spacing or a different presentation style.
FAQ
What is the difference between format and minify?
Format adds line breaks and indentation for readability. Minify removes unnecessary whitespace for a compact result.
What makes JSON invalid?
Common problems include trailing commas, single-quoted strings, missing quotes around property names, and incomplete braces or brackets.
Does this validate JSON Schema?
No. The current tool validates whether the input is valid JSON syntax by parsing it. It does not validate against a schema.
Can it work with YAML and XML too?
Yes. Use the YAML mode for YAML to JSON or JSON to YAML, and XML mode for formatting or minifying XML. JSON Schema validation is handled by the separate schema validator.