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What is the main difference between JIT and AOT in Angular?

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Following are the main differences between JIT and AOT compiler in Angular:

  • Just-in-Time (JIT) compiler compiles our app in the browser at run-time while Ahead-of-Time (AOT) compiler is used to compile your app at build time on the server.
  • The JIT compilation runs by default when you run the ng build (build only), or ng serve (build and serve locally) CLI commands. This is used for development. On the other hand, we have to include the --aot option with the ng build or ng serve command for AOT compilation.
  • JIT and AOT are both two ways used to compile code in an Angular project. JIT compiler is used in development mode while AOT is used for production mode.
  • JIT is easy to use. We can easily implement features and debug in JIT mode because here we have a map file while AOT does not. On the other hand, the biggest advantage of using AOT for production is that it reduces the bundle size for faster rendering.

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