tools  / formatters

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Formatters

Validate and format JSON, HTML, YAML, XML, and more

JSONLint
Validate and format JSON with clear error reporting.
jsonvalidation
JSON Formatter
Pretty-print and validate JSON with configurable indentation.
jsonformatting
Prettier Playground
Try Prettier's opinionated formatter on JS, CSS, HTML, and more.
formattingjscss
W3C Markup Validator
Check HTML and XHTML documents for conformance to W3C standards.
htmlvalidation
YAML Lint
Paste and validate YAML syntax online.
yamlvalidation
XML Formatter
Format, minify, and validate XML documents online.
xmlformatting