Getting 'Method Not Allowed 405' Error – How Do I Fix This? or Why Am I Seeing a 'Method Not Allowed

405 errors are usually a server-side thing.

If you’re using a REST API, make sure the endpoint isn’t missing the method in its definition.

For example, in Express:
```javascript
app.post('/submit', handler) // NOT app.get('/submit', handler)
```

Also, tools like Insomnia or Postman can help debug by sending raw requests.