It depends on how much knowledge you already have regarding front-end and backend development. To become a full stack developer, you need to be good at HTML, CSS, JavaScript, React/Angular/Vue, etc and some backend technology for example Node.js. You need to be good at all of these to develop a project to become a full stack developer.
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I want to become a full stack developer. How long does it take to become one?
It depends on how much knowledge you already have regarding front-end and backend development. To become a full stack developer, you need to be good at HTML, CSS, JavaScript, React/Angular/Vue, etc and some backend technology for example Node.js. You need to be good at all of these to develop a project to become a full stack developer.