Best On-Premises JavaScript Libraries of 2025

DHTMLX is a powerful and easy-to-use JavaScript UI library that provides a wide range of customizable and flexible components for building modern and responsive web applications. It offers 30+ full-featured UI widgets, including grids, charts, diagrams, schedulers, gantt charts, calendars, trees, forms, and more. These components are optimized for fast rendering, ensuring that your application runs smoothly in all browsers and devices. DHTMLX is compatible with popular web frameworks such as React, Angular, and Vue.js. This makes it an excellent choice for developers who are already working with these frameworks and want to add a powerful UI library to their projects. Moreover, DHTMLX supports different data sources and formats, making it easy to integrate with various back-end technologies. DHTMLX provides extensive configuration and customization abilities for its UI components, allowing developers to tailor their appearance and behavior to meet specific application requirements and extend its functionality with custom features if needed. DHTMLX also has comprehensive documentation that covers every aspect of the library, including detailed API references, tutorials, and code examples, as well as an active community.

Interactive Gantt chart components and scheduling components, with project management features built in, are ready for the JavaScript Framework: Angular React Vue. This library was designed to empower businesses around the world. It was developed with common customer needs in mind. Companies of all sizes, governments, and educational institutions use it to create stunning Gantt charts with greater ease. This library is perfect for managing project schedules, tracking resources, or visualizing timelines. Gantt Chart Hyper Library includes -Gantt Chart view - hierarchical grid of data and attached schedule chart with drag-and-drop support and dependency lines. -Schedule View - Chart that displays multiple bars along the same line, with horizontal and vertical drag-and-drop support; -LoadChartView: allocation chart that displays normal and over-allocations on a timeline. -Network Diagram; Pert Chart

UAParser.js provides a structured alternative to the unstructured mess that is real-world user agent strings.

WebDataRocks is a user-friendly and free JavaScript library designed for the creation of efficient pivot tables, compatible with frameworks such as Angular, Vue, and React. It boasts several advantages, including being free of charge and highly customizable, as well as functioning as a JavaScript-based client-side component that can handle 1MB of JSON or CSV data files. Equipped with a comprehensive array of enterprise-level features, WebDataRocks seamlessly integrates with various third-party charting libraries to enhance data visualization capabilities. The library includes functionalities like filtering, sorting, grouping, conditional and number formatting, and calculated values, making it an effective tool for managing and analyzing data. Additionally, users can easily print or export their reports to formats like PDF, Excel, or HTML with just a single click, which streamlines the reporting process significantly. Offering a modern and aesthetically pleasing user interface similar to a spreadsheet, the tool is optimized for both web browsers and applications, ensuring a reliable and enjoyable user experience while working with data.