What is JSON validation?
It checks whether JSON data follows official syntax rules.
Tool workspace
Validate JSON online instantly. Detect syntax errors such as missing commas, invalid quotes, and malformed JSON structures.
Output
JSON Validator helps developers verify whether their JSON data follows the official JSON syntax specification. Invalid JSON can break APIs, applications, and configuration files. This tool quickly detects syntax errors and helps locate the exact issue so you can fix it immediately.
Input
{"name":"John","age":30,}Output
Error: Unexpected trailing comma
JSON validation ensures that the structure follows strict JSON syntax rules. This includes correct use of quotes, commas, brackets, and nesting. Proper validation prevents parsing failures in programming languages and APIs.
It checks whether JSON data follows official syntax rules.
JSON parsers require strict syntax, so malformed JSON cannot be parsed.
Yes. It highlights the syntax issue detected in the input.
Yes. Nested objects and arrays are fully supported.
Yes. Data never leaves your browser.
No. It only checks syntax.