JSON Formatter & Validator
Formatta, minifica e valida JSON. Rileva errori con posizione esatta.
Come utilizzare JSON Formatter & Validator
Attach the JSON
Copy your unformatted or compressed JSON to the "Input JSON" panel on the left. You can also use the "Load Example" button to try with a sample JSON.
Configure options
Choose indentation level (2, 4 or 8 spaces) and enable "Sort keys (A-Z)" if you want object properties to be alphabetically ordered.
Format or Compress
Click "Format" to get a readable JSON with indentation, or click "Minify" to remove all spaces and reduce the file size.
Verify validity
The output panel shows a "Valid" badge in green or "Not Valid" in red. In case of an error, the exact row and column of the issue are indicated.
Copy result
Use the copy button at the top right of the output area to copy formatted JSON to your notes with one click.
Suggerimenti
- Use "Sort keys" before comparing JSONs: sorting keys alphabetically makes differences in structure immediately visible.
- Compression reduction percentage in the statistics bar shows the saved space percentage: useful for deciding whether to compress.
- If you have a partially valid JSON with comments in the style of JavaScript (// ...), remove them first before pasting: The JSON standard format does not support these.
Domande frequenti
How can I format a free online JSON?
Attach your JSON to the input field and click the "Format" button. The tool applies immediate indentation according to configuration and checks the structure's validity.
How do I find an error in my JSON?
When the JSON contains syntax errors, the tool shows a red panel with error message and exact location: row and column number where the problem is found.
What is the difference between formatting and minifying JSON?
Format adds indentation and line breaks to make JSON readable for developers. Minifying removes all unnecessary whitespace to reduce file size, ideal for production.
What is the purpose of the function "Sort keys (A-Z)"?
Alphabetical order of keys is useful for comparing two JSON objects, maintaining deterministic outputs in automated tests or simply finding a property faster.
Is my JSON being sent to a server?
No, all processing occurs locally in your browser. Data is never sent to external servers, so you can use the tool with sensitive data containing JSON.