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JSON Validator and Formatter

Run JSON Validator and Formatter using the supplied input and options.

Unicode text; preserve input unless the selected operation changes it.

Your workbenchInputs are not stored

Result

Enter your values and run the tool to see your result.

What this tool does

Validates JSON syntax and reformats it with indentation. If the syntax is wrong, it tells you where.

How to use it

  1. Paste your JSON into the input box.
  2. Run it to get formatted JSON or an error message.
  3. Copy the formatted result.

Worked example

Input {"a":1} comes back with line breaks and indentation. A missing brace or trailing comma is reported as an error.

Frequently asked questions

Why does JSON with comments fail?
Standard JSON has no comments, so // or /* */ is a syntax error. JSON5 and JSONC used for config files are separate formats.
Does it reorder keys?
No, input order is preserved. If you need sorting, sort the keys yourself or use a different tool.

What this tool does not cover

Input is processed in your browser. It checks syntax only — not schema conformance or whether the values make sense.

References