The development server returned response error code: 500 · Issue #721 · expo/create-react-native-app · GitHub
Ask and Answer - Fix: The development server returned response error code 500, Duplicated files or mocks. Please check the console for more info Solution: I remove the "node_modules/react-native/template" folder at last
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Could not connect to development server on android emulator and on real device · Issue #15388 · facebook/react-native · GitHub
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Could not connect to development server in react native 0.62.2 · Issue #28680 · facebook/react-native · GitHub
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android - the development server returned response error code 500 - react native - ./configs/main - Stack Overflow
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Solve virtual android device warning “ Could not connect to development server “ in react-native | by Levon | Medium
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Unable to load script/could not connect to dev server - Android emulator - Development - Joplin Forum
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The development server returned response error code: 500 · Issue #401 · expo/create-react-native-app · GitHub
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