JSON Formatter guide
Format, validate, minify, and copy JSON data in a readable code workbench.
What this tool does
The formatter parses input with the browser's standards-compliant JSON.parse implementation. When parsing succeeds, Format serializes the value with two-space indentation and Minify serializes it without optional whitespace. Both actions validate syntax before replacing the editor contents.
Parsing and re-serialization preserve JSON data types and nesting, but not insignificant whitespace or the original placement of escaped characters. Duplicate object keys are also reduced according to normal JavaScript parsing behavior, with the last occurrence taking precedence.
How to use it
- Paste or type JSON in the editor.
- Choose Format for two-space indentation or Minify for compact output.
- Read the status line for validation feedback.
- Correct any syntax error and run the action again.
- Copy the transformed JSON when it matches the expected structure.
Benefits
- Immediate syntax validation
- Consistent formatting
- Format and minify modes
- Browser-compatible copy fallback
- Data remains in your browser
Reading validation errors
JSON requires double-quoted property names and string values, matching braces and brackets, and no trailing comma after the final item. It does not allow comments, undefined, functions, NaN, or single-quoted strings. The status line reports the parser message so you can locate the invalid token or position.
Formatting is intended for readability and review; minification is useful when whitespace adds unnecessary size. Neither operation encrypts, signs, or protects the data, so avoid pasting secrets into tools you do not control even when processing is local.