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RFC 8259 Standard

Online JSON Playground & Validator

Format, validate, query and inspect JSON structures with error localization. Write code with auto-formatting, test with standard input (stdin), and inspect terminal output in real-time.

✓ Strict RFC 8259 JSON validation✓ Syntax error line and column detection✓ Prettify and format with custom indent✓ Object depth and key metrics
data.json
RFC 8259 Standard
13px
UTF-8JSON Validator2 SpacesWrap: Off
Ctrl+Enter to Run
Ln 1, Col 120 lines424 chars
Output & ConsoleIdle

Ready to Compile & Run

Click the blue ▶ Run button in the header bar or press Ctrl + Enter to compile and execute your Online JSON Playground & Validator.

How to Run JSON Validator Code Online

Verify JSON syntax correctness, pinpoint missing commas or brackets, and inspect key-value structures.

  1. Paste JSON data, press "▶ Run" or Ctrl + Enter to validate.

Common Errors & Troubleshooting

Encountering compilation or runtime diagnostics? Check these common scenarios:

Trailing commaJSON does not permit trailing commas after the last array item or object property.

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Frequently Asked Questions (JSON Validator)

Yes, validation and formatting run 100% inside your browser.