javascript
Headers already sent - double response
ERR_HTTP_HEADERS_SENT.*Cannot set headers after they are sent
Fixes
- 1.Add return statement after res.send()/res.json()/res.redirect() to prevent further execution
- 2.Check async callbacks for multiple paths that call res.send()
- 3.Use a flag or early return pattern in middleware to ensure only one response is sent
nodejsexpressheaders
Related Errors
javascript3 fixes
Cannot read property of undefined
Cannot read propert(y|ies) of undefined
- •Add optional chaining (?.)
- •Check if object exists before accessing
javascript3 fixes
Cannot read property of null
Cannot read propert(y|ies) of null
- •Add null check before access
- •Use optional chaining (?.)
javascript3 fixes
TypeError: X is not a function
is not a function
- •Check spelling of method name
- •Verify import is correct