React JS Bangla Tutorial

Let’s go through your code and identify issues step-by-step for debugging:

Issue 1: Wrong Context Used in `useProfile` Hook

Problem: In your useProfile hook, you are importing AuthContext instead of ProfileContext.

import AuthContext from "./../context/AuthContext";
return useContext(AuthContext);

Fix: Import ProfileContext and use it in useProfile.

import ProfileContext from "./../context/ProfileContext";
return useContext(ProfileContext);

Issue 2: Missing Default Case in Reducer

Problem: Your profileReducer does not have a default case. If an unsupported action type is dispatched, it will return undefined, breaking the app.
```
switch (action.type) {
    ...
}
```
Fix: Add a default case to return the current state.
```
default:
    return state;
```

Issue 3: Typo in Initial State Export

Problem: The intialState has a typo in the variable name (it should be initialState).

const intialState = { ... };
export { intialState, profileReducer };

Fix: Correct the spelling and update all references.

const initialState = { ... };
export { initialState, profileReducer };

Issue 4: API Call Dependency Array in `useEffect`

Problem: The useEffect in ProfilePage depends on api, but api is not included in the dependency array. This could cause issues if api changes (unlikely here but better to ensure stability).
```
useEffect(() => { ... }, [api]);
```
Fix: Include auth or any other context dependencies if required. Alternatively, ensure api is memoized.

Issue 5: `ProfileInfo` Props Missing Check

Problem: If state.user is null or undefined, ProfileInfo might fail to render properly.
```
<ProfileInfo user={state?.user} />
```
Fix: Ensure a fallback or null check:
```
{
  state?.user && <ProfileInfo user={state.user} />;
}
```

Issue 6: Dispatching Actions Without Validation

Problem: Actions like PROFILE_DATA_FETCHED and PROFILE_DATA_FETCHED_ERROR assume specific action.data or action.error structures. If the API response structure changes or an error occurs, it could break the app.
```
dispatch({ type: "PROFILE_DATA_FETCHED", data: response.data });
dispatch({ type: "PROFILE_DATA_FETCHED_ERROR", error: error.message });
```
Fix: Add error handling for invalid response.data or missing properties.

Issue 7: ProfileProvider Lacks Children

Problem: The ProfileProvider does not render any children inside ProfileContext.Provider.

return (
  <ProfileContext.Provider
    value={{ state, dispatch }}
  ></ProfileContext.Provider>
);

Fix: Pass children as a prop and render it:

export default function ProfileProvider({ children }) {
  return (
    <ProfileContext.Provider value={{ state, dispatch }}>
      {children}
    </ProfileContext.Provider>
  );
}

Final Review

Corrected Issues:

useProfile imports ProfileContext.
Added default case in reducer.
Renamed intialState to initialState.
Corrected dependency array in useEffect.
Fallback added for ProfileInfo.
Validated dispatch actions.
Fixed missing children in ProfileProvider.

Updated Example for `ProfileProvider`:

export default function ProfileProvider({ children }) {
  const [state, dispatch] = useReducer(profileReducer, initialState);
  return (
    <ProfileContext.Provider value={{ state, dispatch }}>
      {children}
    </ProfileContext.Provider>
  );
}

After applying these changes, your app should work as expected! Let me know if you encounter additional issues. 😊

Auth Context and Private Route JWT Implementation

Issue 1: Wrong Context Used in useProfile Hook