JSON Validator
Validate JSON syntax and see detailed error diagnostics.
Input
Validation result
Valid JSON
About the JSON Validator
Check whether your JSON is syntactically valid and get a precise error location with a snippet of the offending line. When valid, view stats like key count, nesting depth, and size.
Examples
Invalid trailing comma
{"a": 1,}Output
Unexpected token } (line 1, column 9)Related tools
JSON Compare
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JSON Formatter
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Pretty-print and beautify JSON with custom indentation.
JSON Minifier
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Compress JSON by removing whitespace and show bytes saved.
JSON String Escape
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Escape special characters for use inside a JSON string.
JSON String Unescape
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Reverse JSON string escaping back to readable text.
JSON to CSV
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Flatten a JSON array of objects into a CSV spreadsheet.
Frequently asked questions
Read more
- Why browser-based developer tools are safer than online converters
Most 'online' formatters upload your data to a server. Here's why client-side processing matters, and how to tell the difference.
- A practical guide to formatting, validating and converting JSON
Indentation, key sorting, common parse errors, and when to convert JSON to YAML, XML or CSV instead.
Version 1.0.0 · Updated 2026-08-06 · Runs entirely in your browser