Yes, JavaScript is sufficient for full-stack development, particularly when working with the MERN or MEAN stacks (MongoDB, Express.js, React/Angular, Node.js). It lets you develop the client and server sides of web applications within a single language. At the front end, JavaScript drives dynamic UIs with libraries such as React or Vue.js. At the back end, Node.js facilitates server-side logic, APIs, and database interactions. With MongoDB, where data is stored in a JavaScript-like JSON format, it is easy to work with databases. A single approach makes development easier, decreases context switching, and speeds up learning. Nevertheless, for more complex projects, learning other technologies (e.g., SQL, TypeScript, Docker) will also prove helpful. Nevertheless, JavaScript by itself is enough to learn a firm and useful basis on which to build finished, scalable web applications and start a career in full-stack development.

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