Converts a JSON column to multiple columns, whereby the column list is heuristically extracted from the
JSON structure. It can either extract the primitive leaf elements (like strings and numbers), omitting the
JSON tree path, or the full JSON structure. The latter, however, may yield some confusing output as the types
of the columns are again JSON or collections of JSON.
Note that this node is meant to be used for "well-structured", relatively flat JSON objects which adhere the
same schema in all rows. In case the JSON objects are more complex it's better to use nodes like
JSON Path or JSON Path (Dictionary).
Some examples on the following JSON column input may help to clarify the generated output.
JSON |
---|
{"a": {"b": [1, 2], "c":"c"}} |
{"a": {"b": [3], "d":null} } |
b | c | d |
---|---|---|
[1,2] | c | ? |
[3] | ? | ? |
1
, Use leaf name (uniquify with (#1)/(#2)/...)a |
---|
{"b": [1, 2], "c":"c"} |
{"b": [3], "d":null} |
.
, Expand to columnsa.b.0 | a.b.1 | a.c | a.d |
---|---|---|---|
1 | 2 | c | ? |
3 | ? | ? | ? |
JSON |
---|
{"a":[{"b": 3}, 4]} |
{"a":[1]} |
1
, Use leaf name (uniquify with (#1)/(#2)/...), Omit nested objects, Expand to columns:a |
---|
[4] |
[1] |
1
or 2
, Use leaf name (uniquify with (#1)/(#2)/...), do not Omit nested objects, Expand to columns:a |
---|
[{"b": 3}, 4] |
[1] |
{"b": 3}
and 4
, not a single JSON value, similarly in the second row, you get a KNIME list of a single JSON value: 1
.
a |
---|
[{"b": 3}, 4] |
[1] |
(#nn)
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To use this node in KNIME, install the extension KNIME JSON-Processing from the below update site following our NodePit Product and Node Installation Guide:
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