JSON Validator
Validate JSON and pinpoint syntax errors.
Open toolDeveloper Tools
JSON Formatter
Format minified JSON with readable indentation. Your input stays in this browser during processing.
Private local processing
Your text and settings stays in this browser.
About JSON Formatter
Turn minified or single-line JSON into readable, two-space indented JSON for easier review, debugging or code comments.
What the result contains
Indented JSON with two-space nesting.
Accepted input
- JSON
- PLAIN
- TXT
How to use JSON Formatter
- Paste the JSON text you want to format.
- Run the formatter and review the indented result.
- Fix reported syntax errors, such as missing commas or brackets, and retry.
- Copy or download the formatted JSON.
Practical example
Turn a one-line API response into readable JSON for inspection or code review.
Check your result before using it
Try a small object containing an array, a quoted string and a null value, then inspect the structure after formatting. Indentation should help reveal nesting, not change the meaning of values. Avoid using a parse-and-format workflow on very large numeric identifiers without checking precision in the output. Store identifiers as strings when their exact digits matter, and validate the resulting document in the system that will consume it.
When to use JSON Formatter
- Expand a one-line API response for inspection during debugging
- Clean up JSON before pasting it into a pull request comment
- Format a configuration payload before saving it to a file
Important limitations
- The input must be valid JSON; comments and trailing commas are rejected.
- Formatting changes whitespace only and does not validate business rules.
Troubleshooting JSON Formatter
A parse error appears
Check quotes, commas and closing brackets, or run JSON Validator to isolate the syntax problem.
Private local processing
The text and settings is processed on this device and is not uploaded to MyFileNest. Closing or refreshing the page clears the active session.
Frequently asked questions
Practical limit: Large text or structured-data inputs can respond more slowly in the browser. Verify generated output before using it in a production workflow.