# "JSON API: Errors"
## Status Codes
Cargo uses conventional HTTP status codes to indicate the success or failure of a request. The most common status codes you'll encounter are:
| Status | Description |
|---------------------------------------------------------------------------------------------------| ------------------------------------------------------------------------------------------------------------------------------------------- |
| 200 | Everything is ok! |
| 400 | The requested resource could not be found.
Cargo will return this status code when accessing the `/cart/*` endpoints without a cart. |
| 422 | The payload has missing required parameters or invalid data was given. Learn more about [validation errors](#validation-errors) below. |
## Validation errors
When invalid data is submitted, Cargo will return a 422 status code with a similar looking response to this:
```json
{
"message": "Invalid discount code",
"errors": {
"discount_code": ["Invalid discount code"]
}
}
```