Validate a JSON string and turn it into a readable format.
The JSON validator parses your JSON, tells you whether it's valid and, if it isn't, shows the error and its position. Valid JSON is formatted with a clean 4-space indentation so it's easy to read. Everything runs in your browser.
JSON is used by APIs, configuration files and structured data such as JSON-LD for SEO. A single missing comma or quote breaks it completely, so validating before you deploy saves a lot of debugging.
Instant feedback on whether the JSON is valid.
The parser message tells you what's wrong and where.
Valid JSON is indented for readability.
Your data never leaves your browser.
Trailing commas, single quotes instead of double quotes, unquoted keys and comments, which aren't allowed in JSON.
Yes, this checks the JSON syntax. Use Google's Rich Results Test to check the schema itself.
Up to 20,000 characters can be validated at once.
No, it's parsed locally in your browser.