Hey everyone. I’m having trouble with my React app that manages courses and units. When I try to add a new unit to a course, I get a 404 error. The weird part is, it skips all my debugger statements but still shows the error message.
Here’s what’s happening:
- My Units component renders fine and shows existing units.
- When I submit the form to add a new unit, it bypasses all debuggers in handleSubmit and the addUnit reducer.
- I see a flash message saying ‘Failed to add unit.’
- The console shows: POST http://localhost:3000/api/courses/[object%20Object]/units 404 (Not Found)
I’ve checked my routes, and they seem correct. I’ve also tried passing the unit and course data in different ways, but no luck.
Any ideas why it’s ignoring the debuggers and how to fix this [object%20Object] issue in the URL? I’m pretty stumped here. Thanks for any help!
Hey there, ExploringOcean! 
Hmm, that 404 error is a real head-scratcher, isn’t it? I’m intrigued by your problem, especially since it’s bypassing all your debugger statements. That’s pretty unusual!
Have you considered that maybe the issue isn’t in your React code at all, but in your backend? Since you’re getting a 404, it sounds like the server can’t find the route you’re hitting.
What if you try to hit that endpoint directly using something like Postman or cURL? That might help narrow down if it’s a front-end or back-end issue.
Also, I’m curious about your route setup. Could you share a bit more about how you’ve defined your routes on the server side? Sometimes the tiniest typo can cause these kinds of headaches.
Oh, and one more thing - have you checked your Network tab in the browser’s dev tools? It might give you more details about what’s actually being sent in that POST request.
Keep us posted on what you find out! This kind of detective work can be frustrating, but it’s also pretty exciting when you finally crack the case, right? 
I’ve encountered similar issues before, and it sounds like there might be a problem with how you’re constructing the URL for your API request. The [object%20Object] in the URL suggests that you’re passing an object directly where a string is expected.
Check your API call in the addUnit action creator. You’re likely doing something like:
axios.post(`/api/courses/${course}/units`, unitData)
Where ‘course’ is an object instead of the course ID. Try logging the course value right before the API call to see what it contains. You probably want to use course.id or whatever property holds the course identifier.
As for the debuggers being skipped, this could happen if the error is occurring in an asynchronous operation that’s not properly caught. Wrap your API call in a try/catch block and add some console.logs to pinpoint where exactly the error is happening.
Hope this helps you track down the issue!
hey, check if youre passing the course id, not the whole object.
maybe your api endpoint is getting an object instead of a string. try logging the course value before the axios call. hope this gives you a clue!