JoltTransformJSON

Description:

Applies a list of Jolt specifications to the flowfile JSON payload. A new FlowFile is created with transformed content and is routed to the 'success' relationship. If the JSON transform fails, the original FlowFile is routed to the 'failure' relationship.

Additional Details...

Tags:

json, jolt, transform, shiftr, chainr, defaultr, removr, cardinality, sort

Properties:

In the list below, the names of required properties appear in bold. Any other properties (not in bold) are considered optional. The table also indicates any default values, and whether a property supports the NiFi Expression Language.

NameDefault ValueAllowable ValuesDescription
Jolt Transformation DSLjolt-transform-chain
  • Cardinality Change the cardinality of input elements to create the output JSON.
  • Chain Execute list of Jolt transformations.
  • Default Apply default values to the output JSON.
  • Modify - Default Writes when key is missing or value is null
  • Modify - Define Writes when key is missing
  • Modify - Overwrite Always overwrite value
  • Remove Remove values from input data to create the output JSON.
  • Shift Shift input JSON/data to create the output JSON.
  • Sort Sort input json key values alphabetically. Any specification set is ignored.
  • Custom Custom Transformation. Requires Custom Transformation Class Name
Specifies the Jolt Transformation that should be used with the provided specification.
Custom Transformation Class NameFully Qualified Class Name for Custom Transformation
Custom Module DirectoryComma-separated list of paths to files and/or directories which contain modules containing custom transformations (that are not included on NiFi's classpath).
Jolt SpecificationJolt Specification for transform of JSON data. This value is ignored if the Jolt Sort Transformation is selected.
Supports Expression Language: true
Transform Cache Size1Compiling a Jolt Transform can be fairly expensive. Ideally, this will be done only once. However, if the Expression Language is used in the transform, we may need a new Transform for each FlowFile. This value controls how many of those Transforms we cache in memory in order to avoid having to compile the Transform each time.

Relationships:

NameDescription
successThe FlowFile with transformed content will be routed to this relationship
failureIf a FlowFile fails processing for any reason (for example, the FlowFile is not valid JSON), it will be routed to this relationship

Reads Attributes:

None specified.

Writes Attributes:

NameDescription
mime.typeAlways set to application/json

State management:

This component does not store state.

Restricted:

This component is not restricted.

Input requirement:

This component requires an incoming relationship.