Libraries tagged by validation errors

JSON Lint for PHP checks a string for invalid or malformed JSON, control character error, incorrect encoding or just plain old syntax errors. It returns comprehensive feedback in a one-line error message (one-line message especially meant for REST APIs) about the first error that occurred in the (JSON) string. It supports both RFC 4627 and (its superseding) RFC 7159.

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A Laravel package to easily display errors from validator.

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validates the csv files and aggregate the errors

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A wrapper around the Symfony's validator component. Use it to automate JSON response with simple errors.

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Graphql validate error formatter for API Platform

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Validate Mailchimp API key format, detect common errors (whitespace, missing datacenter suffix), and verify connectivity.

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SEO Quick Validator inspects live web pages for on-page SEO errors and tag issues. Pass any URL to inspect title lengths, meta descriptions, H1 headings, viewport and canonical tags, image alt text, and unverified external links.

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Regex Tester tests regular expressions against input strings across operations like match, search, replace, and split. It reports compilation validity, syntax error details, execution timing, and structural pattern analysis.

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JSON Schema Validator is a JSON validator API that tests any JSON object against a JSON Schema you provide, so you can check JSON against its schema before trusting it. It reports pass-fail status and total error count, while paid plans add specific error messages.

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a little helper to xml handling with DOMDocument. opening and especial a powerful validating tool, where errors are not simply written to the logs. you're able to get them and present it anywhere.

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