How to you display such messages in your frontend? [modifying message structure]

[Bishwas-py]

This error message looks so clumsy, how do you guys display such a message in your frontend? A SvelteKit example would be great

{
  "detail": [
    {
      "loc": [
        "body",
        "site",
        "base_url"
      ],
      "msg": "field required",
      "type": "value_error.missing"
    }
  ]
}

or, is there a way to change the message structure, to something simpler like:

json_message = {
    "field": "base_url",
    "message": "This field is required",
    "alias": "field_required"
}

[sebastian-philipp]

this is how we massage things:

@api.exception_handler(NinjaValidationError)
def validation_error(
    request: HttpRequest, exc: NinjaValidationError
) -> HttpResponse:
    out = defaultdict(list)
    for e in exc.errors:
        loc = e['loc']
        if loc and loc[0] == 'body':
            loc = loc[2:]
        elif len(loc) > 1:
            loc = loc[1:]
        if '__root__' in loc:
            loc = ['detail']
        msg = e['msg']
        out['.'.join(map(str, loc))].append(msg)
    return api.create_response(request, out, status=400)

Generates something that feels kinda similar to Django stock validation errors

[Bishwas-py]

Sorry for the typo.

[Bishwas-py]

I did this:

@api.exception_handler(ValidationError)
def validation_error(request: HttpRequest, exc: ValidationError) -> HttpResponse:
    dict_out = defaultdict(list)
    for error in exc.errors:
        loc = error['loc']
        if loc and loc[0] == 'body':
            loc = loc[2:]
        elif len(loc) > 1:
            loc = loc[1:]
        if '__root__' in loc:
            loc = ['detail']
        msg = error['msg']
        dict_out['.'.join(map(str, loc))] = msg
    return api.create_response(request, {"inline": dict_out}, status=400)

Is it a bad practice?

[sebastian-philipp]

What style do you prefer? FastAPI or Django? IMO both are valid and best practice