polars.Series.str.json_path_match#

Series.str.json_path_match(json_path: IntoExprColumn) → Series[source]#

Extract the first match of json string with provided JSONPath expression.

Throw errors if encounter invalid json strings. All return value will be casted to String regardless of the original value.

Documentation on JSONPath standard can be found here.

Parameters:

json_path: A valid JSON path query string.

Returns:

Series: Series of data type String. Contains null values if the original value is null or the json_path returns nothing.

Examples

>>> df = pl.DataFrame(
...     {"json_val": ['{"a":"1"}', None, '{"a":2}', '{"a":2.1}', '{"a":true}']}
... )
>>> df.select(pl.col("json_val").str.json_path_match("$.a"))[:, 0]
shape: (5,)
Series: 'json_val' [str]
[
    "1"
    null
    "2"
    "2.1"
    "true"
]