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This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc. If you wish to validate specific content such as RSS/Atom feeds or CSS stylesheets, MobileOK content, or to find broken links, there are other validators and tools available. As an alternative you can also try our non-DTD-based validator.
SSN Validator | Free SSN Validation | Free SSN Verification
SSN Validator provides a free lookup of Social Security Administration public records of social security numbers issued including death claim information.
Validator | Definition of Validator at
Validator definition, to make valid; substantiate; confirm: Time validated our suspicions. See more.
Free Online HTML Validator -
HTML Validator / Linter. Validates HTML files for compliance against the W3C standards and performs linting to assess code quality against best practices.
Phone Validator | Is it a Cell or is it a Landline?
Free phone number validation provided by Check phone numbers to verify if they are cell phones or landlines. Works with all U.S. phone numbers.
JSONLint - The JSON Validator
About JSONLint? JSONLint is a validator and reformatter for JSON, a lightweight data-interchange format. Copy and paste, directly type, or input a URL in the editor above and let JSONLint tidy and validate your messy JSON code.
validator - npm
Validator Description; contains(str, seed) check if the string contains the seed. equals(str, comparison) check if the string matches the comparison.
JSON Formatter & Validator
The JSON Formatter & Validator helps debugging JSON data by formatting and validating JSON data so that it can easily be read by human beings.
The Bean Validation reference implementation. - Hibernate ...
Hibernate Validator offers additional value on top of the features required by Bean Validation. For example, a programmatic constraint configuration API as well as an annotation processor which plugs into the build process and raises compilation errors whenever constraint annotations are incorrectly used.