JSON Formatter & Validator input is rejected
The source data may be incomplete, malformed, or different from the format this tool expects.
Check the input hint, try a small sample first, and correct the source file before running the full job.
Use this tool
Prepare the input and run the tool
Paste the text or structured data for this tool. Result: Copy result, Preview result, Review issue report.
Paste JSON and click Run.
Result appears here.
Data handling: Files and pasted data are processed in this browser session.
Readiness details
What to check before using the result
Sample input
JSON copied from an API response, config file, webhook payload, or developer handoff.
Output preview
Formatted JSON, minified JSON, or a syntax error message with the parse position when available.
Expected checks
- Valid JSON syntax
- Readable indentation
- Minified output
- Parse error location
Artifacts you can produce
- Copyable formatted or minified JSON
Limits to review
- Does not validate business rules unless you use a schema-specific tool.
Practical notes
- Remove secrets before sharing formatted JSON.
- Use schema validation when structure matters, not only syntax.
Tool guide
How to use JSON Formatter & Validator
Use JSON Formatter & Validator when you need to check, convert, or prepare a file before using it in another app. Review the result before downloading or copying it.
What this tool does
Format JSON to readable indented output or minify it, while validating syntax and showing parse errors.
- Input
- Paste the text or structured data for this tool
- Output
- Copy result, Preview result, Review issue report
Tool advantages
- Runs in this page; the file or pasted data is not sent to a new app.
- Keeps the preview, report, and download in the same screen.
- Gives you a report you can use as a cleanup list.
Step-by-step usage guide
- 1Add your data and confirm the options.
- 2Run JSON Formatter & Validator.
- 3Review the report and copy or download the result.
Common errors and fixes
JSON Formatter & Validator result looks incomplete
The preview can only use the rows, files, or fields provided in the current browser session.
Confirm that the full source was pasted or selected, then rerun the tool and review the output before downloading.
JSON Formatter & Validator output needs extra cleanup
Some destination systems have rules that are stricter than a browser-local utility can infer.
Use the report as a cleanup checklist and verify the final file in the app where it will be imported or shared.
When to use JSON Formatter & Validator
- You are checking files before an upload, import, share, or delivery.
- You want to confirm the result before sending it to another system.
- You need a copied result, downloaded file, or report that can be reviewed outside the page.
FAQ
Does this tool upload JSON to a server?
No, all parsing and formatting happens in your browser. Your JSON is not sent anywhere.
Can it tell me where JSON is invalid?
Yes. It shows the browser JSON.parse error message, including the position when possible.
What is the difference between Format and Minify?
Format adds readable indentation and line breaks. Minify removes whitespace while keeping structure.