If you are writting client side, than you don't need docker. But if you are writting server side and use some external services, than you should think about a docker. It gives you an abiliity to connect to external services by hostname, and thanks to that you can emulate production environment on your local computer. What is more docker and docker-compose is powerfull tool which can gives you a lot of benefits if know hot to use it correct.
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If you are writting client side, than you don't need docker. But if you are writting server side and use some external services, than you should think about a docker. It gives you an abiliity to connect to external services by hostname, and thanks to that you can emulate production environment on your local computer. What is more docker and docker-compose is powerfull tool which can gives you a lot of benefits if know hot to use it correct.