JSON Validator
Check JSON syntax validity and pinpoint errors with detailed diagnostics.
How to Use the JSON Validator
Follow these simple steps to use this tool directly in your browser.
Paste JSON Payload
Insert your JSON text into the validation box.
Click Validate JSON
Our engine parses the string and verifies RFC 8259 syntax compliance.
Inspect Feedback
View a green confirmation with structure statistics or an exact syntax error message.
Key Features
Detailed Diagnostics
Receives immediate feedback detailing why parsing failed.
Payload Inspection
Displays root object type, key count, and total byte size.
Valid JSON syntax requires double quotes for all string keys and values, strictly forbids trailing commas, and requires balanced brackets and braces. Even a single trailing comma can crash production API endpoints.
Frequently Asked Questions
Standard RFC 8259 JSON requires double quotation marks (") for strings and object keys; single quotes are invalid in strict JSON.
Related Tools
Check out other free utilities that complement the JSON Validator.
JSON Formatter
Format and beautify JSON with syntax indentation.
Base64 Encoder/Decoder
Encode and decode UTF-8 text to Base64 safely.
UUID Generator
Generate bulk RFC 4122 v4 UUIDs instantly.
Regex Tester
Live regular expression evaluator with match highlights.