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Utilities for validating user-facing input strings against common formats before processing.
Distinct from Data Validation: Candidates focus on specific phone number logic or backend data validation rather than general frontend input validation.
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is.js is a JavaScript validation library and data type checker. It provides a suite of utilities to verify whether variables are primitives, arrays, functions, or specific object types. The project allows for the implementation of custom validation logic and the use of naming namespaces to override default rules and regular expressions. It covers a broad range of validation capabilities, including numeric arithmetic properties, date and time analysis for relative and absolute ranges, and string format verification for patterns such as emails, URLs, and IP addresses. The library also includes
Verifies that user input strings match specific formats like emails, URLs, and phone numbers before processing.