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JSON Formatter &
Syntax Validator.

Validate JSON structures, pretty print nested payloads, and strip whitespace instantly in your browser. Zero server requests.

✓ VALID JSON SYNTAX

Troubleshooting JSON Syntax Errors

JSON (JavaScript Object Notation) is the universal data interchange format for modern REST APIs, GraphQL payloads, and microservice RPC communications. Unlike relaxed JavaScript object literals, RFC 8259 enforces strict syntactic rules.

When validating API responses or debugging configuration payloads, check for these frequent pitfalls:

  • Trailing Commas: Adding a comma after the final item in an object or array causes standard JSON parsers to throw SyntaxError: Unexpected token.
  • Single Quotes: All JSON property keys and string values must be enclosed in double quotes ("key": "value").
  • Unescaped Control Characters: Newlines, tabs, and backslashes inside string values must be properly escaped (\n, \\).

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