Validate & query
Check syntax, and test JSONPath, XPath and CSS selectors.
13 tools · nothing uploaded
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- PopularCSS Selector TesterSee exactly which elements a CSS selector matches.
- PopularCSS Specificity CalculatorWork out which selector wins, including the :is, :where and :not traps.
- PopularCSS ValidatorFind unbalanced braces, unclosed comments and unitless lengths.
- PopularHTML ValidatorFind unclosed tags, mismatched nesting, duplicate ids and missing alt text.
- PopularJavaScript ValidatorCheck JavaScript syntax with your browser’s own engine.
- JSON Pointer TesterTest an RFC 6901 JSON Pointer against a document.
- PopularJSON Schema ValidatorValidate JSON and generate a draft-07 schema from its shape.
- PopularJSON ValidatorFind the exact line and column where your JSON breaks.
- PopularJSONPath TesterRun a JSONPath query and see every match and where it came from.
- Markdown ValidatorFind heading jumps, unclosed fences and empty links.
- PHP ValidatorCheck PHP braces, brackets and quotes, and flag unescaped input.
- TOML ValidatorCheck TOML structure and catch duplicate keys.
- PopularXPath TesterRun an XPath expression against HTML with your browser’s own engine.
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