FieldExtractor

FieldExtractor

Extracts specific fields from input data using JSONPath expressions. This step uses JSONPath syntax to extract data from structured inputs (Pydantic models, dicts, lists). The input is first converted to a dict using model_dump() if it's a Pydantic model, then the JSONPath expression is evaluated. If the JSONPath matches multiple values, the step yields multiple output messages (1-to-many cardinality). If it matches a single value, it yields one output message. If it matches nothing, it raises an error. The extracted data is used to construct the output variable by passing it as keyword arguments to the output type's constructor. Example JSONPath expressions: - $.field_name - Extract a single field - $.items[*] - Extract all items from a list - $.items[?(@.price > 10)] - Filter items by condition

• type (Literal): (No documentation available.)
• json_path (str): JSONPath expression to extract data from the input. Uses jsonpath-ng syntax.
• fail_on_missing (bool): Whether to raise an error if the JSONPath matches no data. If False, returns None.