Provide better error messages for invalid JSON

[temparus]

The API should accept a JSON-Schema for the field event.additional_fields.

While trying to set the following JSON-Schema, an unexpected error occurs.

{
      "$schema": "http://json-schema.org/draft-04/schema#",
      "type": "object",
      "additionalProperties": False,
      "properties": {
        "firstName": {
            "type": "string",
            "description":"Vorname"
        },
        "lastName": {
            "type": "string",
            "description":"Nachname"
        },
        "abo": {
          "type":"string",
          "description":"Abo",
          "enum": ["nix", "Halbtax", "Gleis7", "GA"]
        }
      },
      "required":["firstName", "lastName"]
}

Expected behavior No error is expected.

Actual behavior The API returns the following error: {"additional_fields":"Must be json, parsing failed with exception: No JSON object could be decoded"}

[NotSpecial]

This is because your data is invalid JSON. Check with this online linter.

Concretely, the False has to be false.

Maybe the API can provide better error messages? Or should the frontend rather do the JSON linting?

[temparus]

Oh so true. Now it works. That means that it is wrong in the documentation. I'll open another issue for that.

[temparus]

I don't think that this is necessary. As there are online validators for JSON, this can be checked by the developer themselves. I was biased by the wrong documentation and didn't thought that it could be wrong.