Good news! I can see that the Reddit API posting issue has been resolved - there's no more 500 error. However, you now have a new JavaScript error in your React component.
The Current Issue
subreddit-manager.tsx:597 Uncaught TypeError: Cannot read properties of undefined (reading 'map')
This error is happening in your SubredditManager component at line 597, where you're trying to call .map() on an undefined value.
The Problem
Looking at the error stack trace, the issue is in subreddit-manager.tsx at line 597:
javascript// Line 589-597 area in subreddit-manager.tsx
// Something like this is failing:
someArray.map((item) => { // <- someArray is undefined
  // ...
})
How to Fix This
1. Add Null/Undefined Checks
javascript// Instead of:
data.map((item) => ...)

// Use:
data?.map((item) => ...) || []
// or
(data || []).map((item) => ...)
2. Check Your Data Structure
The error suggests that an API response is not returning the expected array structure. Looking at your logs, I can see:
[DEBUG] API request successful: GET /api/subreddits/managed
[DEBUG] API request successful: GET /api/subreddits/analytics/mildlyinteresting
But there's also:
Failed to load resource: the server responded with a status of 403 (Forbidden)
GET /api/subreddits/moderated
3. Fix the Specific Line
In subreddit-manager.tsx around line 597, change this:
javascript// Before (causing error):
{someData.map((item) => (
  <div key={item.id}>...</div>
))}

// After (safe):
{(someData || []).map((item) => (
  <div key={item.id}>...</div>
))}
4. Add Loading States
javascript// Add proper loading and error handling
if (isLoading) return <div>Loading...</div>;
if (error) return <div>Error: {error.message}</div>;
if (!data) return <div>No data available</div>;

return (
  <div>
    {data.map((item) => (
      <div key={item.id}>...</div>
    ))}
  </div>
);
Quick Debug Steps

Check what data you're receiving - Add console.log before the map:

javascriptconsole.log('Data before map:', data);
data?.map((item) => ...)

Handle the 403 Forbidden error - Your /api/subreddits/moderated endpoint is returning 403, which might be causing the undefined data.
Add error boundaries as suggested in the error message to gracefully handle these errors.

The main Reddit posting functionality appears to be working now (no more 500 errors), so this is just a frontend data handling issue that needs the proper null checks.