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Added in a more user-friendly error message for when a field is missi… #503

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Added in a more user-friendly error message for when a field is missi… #503

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7 changes: 7 additions & 0 deletions dataclasses_json/core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -169,6 +169,13 @@ def _decode_dataclass(cls, kvs, infer_missing):
if not field.init:
continue

if field.name not in kvs:
# Raise an user friendly error message, letting the code crash
# with the default error message if the field is required.
raise TypeError(
f"The JSON data is missing the required field '{field.name}' when decoding {cls.__name__} from JSON."
)

field_value = kvs[field.name]
field_type = types[field.name]
if field_value is None:
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