JSON Link Validator
Identify syntax errors in your JSON instantly. Free online tool to validate, fix, and debug your JSON data.
Free Tool
Check JSON Validity
Paste your JSON below to check for syntax errors. We'll tell you exactly what's wrong.
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JSON Syntax Matters
JSON is strict. A single missing comma or a stray single quote can break your application or API call. The JSON Validator helps you catch these subtle syntax errors before they cause runtime exceptions in your code.
Common JSON Pitfalls
- Trailing Commas: Unlike JavaScript objects, JSON does not allow a comma after the last element in an array or object.
- Quotes: Property names (keys) must be enclosed in double quotes.
{ name: value }is invalid;{ "name": "value" }is correct. - Data Types: JSON supports strings, numbers, objects, arrays, booleans, and null. It does not support undefined, functions, or dates.
How it works
This tool attempts to parse your input using the browser's native JSON parser. If parsing fails, it captures the error message thrown by the JavaScript engine to tell you exactly where the syntax violated the rules.
Frequently asked questions
Understanding JSON syntax rules
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