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I prefer simplicity and using the first example but I'd be happy to hear other options. Here's a few examples:
HTTP/1.1 403 POST /endpoint
{ "message": "Unauthorized access" }
HTTP/1.1 403 POST /endpoint
Unauthorized access (no json)
HTTP/1.1 403 POST /endpoint
{ "error": "Unauthorized access" }
HTTP/1.1 403 POST /endpoint
{
"code": "UNAUTHORIZED",
"message": "Unauthorized access",
}
HTTP/1.1 200 (🤡) POST /endpoint
{
"error": true,
"message": "Unauthorized access",
}
HTTP/1.1 403 POST /endpoint
{
"status": 403,
"code": "UNAUTHORIZED",
"message": "Unauthorized access",
}
Or your own example.
The status code that gets returned should be the status code of the messenger and not the data. If you want to add a status code about the data, then please do.
If something can return null and empty and it's valid, that is not a 404. That is a 200.
As far as a 403, the messenger is telling you that you shall not pass. There is no data. 403 is appropriate here. The return response can be anything since 403 is pretty self explanatory, but I would probably return json to be consistent. I would also use the field message. Something like the first one for this use case only.
In other cases where i do get data, I would use data, message, status (optional). But status in the json response would be status about the message.