API Returns 401 Unauthorized Error: Causes and How to Fix It
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API Returns 401 Unauthorized Error: Causes and How to Fix It
An API 401 Unauthorized error means the request was received by the server, but authentication failed or was missing. This is one of the most common API errors developers encounter when integrating third-party services.
What Does 401 Unauthorized Mean?
The server requires valid authentication credentials, but the request did not provide them correctly or at all.
Common Causes
- Missing API key or token
- Expired access token
- Invalid authentication header
- Incorrect OAuth configuration
How to Fix API 401 Unauthorized Error
- Verify your API key or access token
- Check authorization headers
- Regenerate expired tokens
- Confirm required OAuth scopes
Conclusion
A 401 error is almost always an authentication issue. Once credentials are correctly configured, API requests should work normally.
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