JSON Validator
Validate JSON syntax and see detailed error diagnostics.
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)Keyboard shortcuts
- Copy the main outputCtrl / ⌘ + Shift + C
- Download the resultCtrl / ⌘ + S
- Share this toolCtrl / ⌘ + Shift + S
- Reset the inputsAlt + R
- Open the tool search paletteCtrl / ⌘ + K
Related tools
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JSON Repair / Auto-fixer
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Auto-fix broken JSON: quotes, trailing commas, comments, and more.
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.
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.
- JSON Schema validation in real projects
Beyond 'required fields' — writing JSON Schemas that catch real bugs, choosing a validator, and using schemas as living documentation.
Version 1.0.0 · Updated 2026-08-06 · Runs entirely in your browser