JSON Validator

Open this tool when you want a quick answer to one question: is this JSON actually valid? It is especially useful for config files, API request bodies, and test fixtures where a small syntax error can break an entire flow.

Validation happens only in the browser, so the input is not uploaded to a server. That makes it safer for internal or short-lived debugging data.

When to use it

• When you want a final syntax check before sending an API body
• When you need to verify whether JSON received from a teammate can really be parsed
• When you copied a JSON fragment from logs and need to confirm it is complete

What this tool validates

The tool focuses on JSON syntax validity and parseability, not full schema enforcement.

• Valid input returns a success message and parsed output
• sortKeys helps when you want a stable order for inspection
• escapeUnicode helps when you want escaped output for non-ASCII characters

Common mistakes

• Using single quotes in place of valid JSON string quotes
• Leaving a trailing comma after the last property
• Mixing quoted and unquoted values incorrectly
• Assuming syntax validation is the same as JSON Schema validation

Example input

{"name":"zzzbbb","enabled":true}

Example output

Valid JSON.