Awesome GitHub RepositoriesVanilla JS Library Integrations

intl-tel-input is an international telephone input widget that provides a country-aware phone number entry experience with automatic formatting, validation, and E.164 normalization. It combines a searchable country picker with a format-as-you-type engine and a validation rule engine that checks numbers against country-specific patterns, returning machine-readable error codes when a number is invalid. The project ships as both a zero-dependency vanilla JavaScript library and as framework-specific components for React, Vue, Angular, and Svelte, all sharing the same core logic through a framewor

Final Form is a framework-agnostic form state management library that tracks values, errors, and validation states for web applications. It operates as a reactive state engine, allowing individual form inputs to subscribe only to the specific state slices they require, such as values, touched status, or errors, in order to prevent unnecessary component re-renders across large forms. The library manages core form orchestration features including field registration, initialization, submission handling, typed data support, and integration with standard document elements or component-based rende