Free tool
Validate raw JSON strings, identify syntax error line numbers, and inspect Schema.org structured data payloads for compliance.
A single misplaced comma, unescaped quotation mark, or unmatched bracket in a JSON feed will cause webhooks to fail, API calls to abort with HTTP 400 Bad Request, and search engine crawlers to reject product schema markup. Validating strings before deploying updates protects catalog stability.
The three most frequent JSON syntax errors in retail feeds are: 1) Trailing commas (leaving a comma after the final key-value pair in an object); 2) Single quotes (using 'key' instead of 'key'); and 3) Unescaped special characters inside product descriptions (such as raw newlines or unescaped quotes in dimension strings like 12-inch screen).
Search engines require syntactically valid JSON-LD to award rich snippet badges. Running your structured data through a client-side validator catches syntax errors before submitting URLs to Google Search Console, preventing costly rich result disqualifications.
JSON becomes invalid when using single quotes around strings or keys, leaving trailing commas after final elements, using unquoted keys, omitting closing brackets/braces, or including unescaped control characters.
No, standard JSON does not support comments (such as // or /* */). If your application requires comments in configuration files, formats like JSON5, YAML, or TOML should be used instead.
This tool validates structural JSON syntax and parser compliance. To validate specific Schema.org schema entity requirements (such as required Offer and Price fields for Google Rich Results), test the output in Google's Rich Results Test.
When a syntax error is detected, the browser parser identifies the character position and line number where parsing failed, highlighting the exact location of missing commas or mismatched brackets.
Format, indent, prettify, and inspect raw JSON payloads, API responses, and Schema.org structured data locally in your browser.
Encode text strings and data into Base64 format or decode Base64 strings back to plain text locally in your browser.
Decode percent-encoded URLs, query string parameters, and tracking strings into clean human-readable text.
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