JSON Path (Dictionary)

Collects the parts specified by JSONPaths from a JSON column. For those parts that cannot be found or have incompatible types, missing values will be returned.

Example input table:

column name	path	type
bookyear	$.book[*].year	List(Double)
invalidyear	$.book[2].year	Double
timeline	$.book[?(@.year==1999)].title	String
paths	$..*	List(Path)

Example input:

{"book": [
  {"year": 1999,
   "title": "Timeline",
   "author": "Michael Crichton"},
  {"year": 2000,
   "title": "Plain Truth",
   "author": "Jodi Picoult"}
]}

The results look like this:

bookyear	invalidyear	timeline
{1999, 2000}	?	Timeline

The paths column contains the following values (String list): $['book'], $['book'][0], $['book'][1], $['book'][0]['year'], $['book'][0]['title'], $['book'][0]['author'], $['book'][1]['year'], $['book'][1]['title'], $['book'][1]['author']

Options

JSON column

The name of the JSON column to extract content from the first input table.

Remove source column

When checked, the source column will be removed.

JSONPath

The name of the JSONPath column from the second input table.

Type of column

The name of the type column from the second input table. The content should be one of these values in each row:

Boolean - logical values (true/false)
Integer - integer values
Long - integer values (with possibly large absolute values)
Double - real (double precision floating point) numbers
String - string of characters/textual content
Json - another JSON values
Path - generate JSON paths
Base64 - binary objects (encoded as Base64 strings)
List(Boolean) - list of logical values (true/false)
List(Integer) - list of integer values
List(Long) - list of possibly large magnitude integer values
List(Double) - list of real (double precision floating point) numbers
List(String) - list of string of characters/textual content
List(Json) - list of another JSON values
List(Path) - generate list of JSON paths
List(Base64) - list of binary objects (encoded as Base64 strings)
Set(Boolean) - set of logical values (true/false)
Set(Integer) - set of integer values
Set(Long) - set of possibly large magnitude integer values
Set(Double) - set of real (double precision floating point) numbers
Set(String) - set of string of characters/textual content
Set(Json) - set of another JSON values
Set(Path) - generate set of JSON paths
Set(Base64) - list of binary objects (encoded as Base64 strings)

Output name

The name of the new output column from the second input table. (In case of conflict, a new column name will be generated.)

Input Ports

: Table containing JSON column
: Table containing JSONPath, type and output column name definitions.

Output Ports

: Table with extracted columns appended

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Installation

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:

v5.4

A zipped version of the software site can be downloaded here.

Plugin provider: KNIME AG, Zurich, Switzerland

Plugin version: 5.4.0.v202411251149

On NodePit since: 2024-12-06

Last update: 2024-12-21

KNIME versions: Since v3.6

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