SurveyJS is a set of four open-source JavaScript libraries that offer the benefits of a tailor-made in-house survey application, while considerably reducing the time and resources needed to deploy the system. These libraries are independent of specific server code or database requirements and seamlessly integrate with popular JavaScript frameworks, including React, Angular, Vue.js, jQuery, Knockout, and more. They are designed to communicate with any server that can handle JSON requests, ensuring compatibility with various server architectures and databases.
The product family is composed of:
- An open-source MIT-licensed rendering library that renders dynamic JSON-based forms in your web application, and collects responses.
- A self-hosted drag & drop form builder that features an integrated CSS-based theme editor and a GUI for conditional rules. It automatically generates JSON definitions (schemas) of your forms in real time.
- PDF Generator, a library that renders SurveyJS surveys and forms as PDF files in a browser;
- The Dashboard library that allows you to simplify survey data analysis with interactive and customizable charts and tables.
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IndexedDB
IndexedDB serves as a fundamental API designed for the client-side storage of large volumes of structured data, including files and blobs. It utilizes indexing to facilitate efficient searches, making it suitable for extensive datasets. While traditional web storage can handle smaller data quantities well, it falls short when it comes to managing larger structured datasets, a gap that IndexedDB effectively fills. Functioning as a transactional database system akin to SQL-based Relational Database Management Systems (RDBMS), IndexedDB diverges from them by operating as a JavaScript-based object-oriented database. This distinction allows it to store and retrieve objects indexed by keys, with support for any objects that comply with the structured clone algorithm. Users must outline the database schema, establish a connection, and execute retrieval and updating of data through a series of transactions. Additionally, like other web storage solutions, IndexedDB adheres to the same-origin policy, ensuring data security and integrity across different domains. With its versatility and capability, IndexedDB has become an essential tool for developers dealing with complex data needs on the web.
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RxDB
RxDB is a NoSQL database designed for local-first use, particularly suited for contemporary web and mobile applications. It facilitates offline-first capabilities by saving data directly on the client side through various storage engines such as IndexedDB, OPFS, and SQLite. With real-time reactivity, RxDB allows developers to monitor changes in documents, fields, or queries, which means that UI components can reflect data updates instantly. Its adaptable replication engine offers synchronization with multiple backends and custom endpoints, providing flexibility for various use cases. Furthermore, RxDB easily integrates with different frameworks and environments, enhancing its usability. Key features include field-level encryption, schema validation, conflict resolution, backup and restoration options, as well as support for attachments and CRDTs. By minimizing server demands and enabling rapid local queries, RxDB significantly boosts performance and scalability, making it a prime choice for applications that need real-time updates, offline functionality, and uniformity across platforms. The combination of these capabilities positions RxDB as a forward-thinking solution for developers aiming to build efficient and responsive applications.
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