Strict JSON syntax
Valid JSON requires double-quoted property names and strings, no comments, and no trailing commas. JavaScript object literals can look similar while still being invalid JSON.
JSON Formatter
Paste or load JSON, validate its syntax, and transform it into readable formatted output or compact minified text. Copy the result, download it, or use the parsing error to locate invalid input.
Features
Syntax highlightingError detection and reportingFormat and minifyTree view visualizationCopy to clipboardFile upload/download
How to use the JSON Formatter
- 1Paste JSON or choose a .json or .txt file.
- 2Select Format for readable indentation, Minify for compact output, or Validate to check syntax.
- 3Review the output or use the error message to correct invalid JSON.
- 4Copy the result or download it as a JSON file.
Common uses
- Read a compact API response.
- Validate a configuration or payload before submission.
- Minify JSON used in a fixture or embedded asset.
Frequently asked questions
Does the formatter repair invalid JSON automatically?
No. It reports parsing errors so you can correct the source without silent data changes.
Does it include a collapsible tree view?
No. The current output is formatted or minified text rather than an interactive tree.
Is pasted JSON uploaded?
No. Parsing and formatting happen locally in your browser.
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