WebSQL

WebSQL is a deprecated web API that provided a client-side relational database for web applications using SQL queries. It allowed developers to store structured data locally in the browser, enabling offline functionality and faster data access. However, it was never standardized and has been replaced by modern alternatives like IndexedDB.

Also known as: Web SQL Database, Web SQL, WebSQL Database, SQLite in the browser, Client-side SQL

Why learn WebSQL?

Developers should learn WebSQL primarily for maintaining legacy web applications that still rely on it, as it was widely used in older browsers like Chrome and Safari. It's useful for understanding the evolution of client-side storage technologies and for scenarios requiring SQL-based querying in historical projects, but new development should avoid it due to lack of support and standardization.

Learning Resources

• docs: MDN Web Docs: WebSQL
• docs: W3C Web SQL Database Specification
• tutorial: HTML5 Rocks: Client-Side Storage
• video: YouTube: WebSQL Tutorial