# Error Handling

During development of client code (code that makes requests to the Testpad API), it is recommended to catch all errors and to print their details out to the console or a log file for inspection of what went wrong.

Once in production, client code might scale back on the verbosity of its error reporting, however, it should nevertheless always maintain specific handling for the following error conditions, which, in theory, could happen to any request:

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`401 Unauthorized`

The error 401 Unauthorized will be returned if your access token does not have, or no longer has, the relevant permissions to access the API.

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`429 Too Many Requests`

The error 429 Too Many Requests will be returned to any request that exceeds Testpad's rate limits. Please see [Rate Limiting](//openapi/rate-limiting) for details.

If your code receives this error, it must wait for the indicated amount of time before trying again.