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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.
Validator | Definition of Validator at
Validator definition, to make valid; substantiate; confirm: Time validated our suspicions. See more.
validator - npm
Validator Description; contains(str, seed) check if the string contains the seed. equals(str, comparison) check if the string matches the comparison.
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. (X)HTML5 Validator (X)HTML5 Validator (Living Validator). Validator Input. Document: Show Image Report: Show Source
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.
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.
Address Validator: UPS - United States
Note: UPS assumes no liability for the information provided by the UPS Address Validation Page. The Address Validation Page does not support the identification or verification of occupants at an address. The customer is responsible for the accuracy of all information contained on shipping documents and all fees as a result of address corrections.
SSN Validator | Free SSN Validation | Free SSN Verification
SSN Validator provides a free lookup of U.S. Government public records of SSNs issued including death claim information.
JSON Formatter & Validator
Over the years the JSON Formatter & Validator has been immensely improved through the feedback and suggestions of its users. We encourage you to continue to pass along any new recommendations, requests or bug reports.