JoltTransformJSON 2025.10.2.19¶

Bundle¶

org.apache.nifi | nifi-jolt-nar

Description¶

Applies a list of Jolt specifications to either the FlowFile JSON content or a specified FlowFile JSON attribute. If the JSON transform fails, the original FlowFile is routed to the ‘failure’ relationship.

Tags¶

cardinality, chainr, default, jolt, json, remove, shift, sort, transform

Input Requirement¶

REQUIRED

Supports Sensitive Dynamic Properties¶

false

Properties¶

Property	Description
Custom Module Directory	Comma-separated list of paths to files and/or directories which contain modules containing custom transformations (that are not included on NiFi’s classpath).
Custom Transformation Class Name	Fully Qualified Class Name for Custom Transformation
JSON Source	Specifies whether the Jolt transformation is applied to FlowFile JSON content or to specified FlowFile JSON attribute.
JSON Source Attribute	The FlowFile attribute containing JSON to be transformed.
Jolt Specification	Jolt Specification for transformation of JSON data. The value for this property may be the text of a Jolt specification or the path to a file containing a Jolt specification. ‘Jolt Specification’ must be set, or the value is ignored if the Jolt Sort Transformation is selected.
Jolt Transform	Specifies the Jolt Transformation that should be used with the provided specification.
Max String Length	The maximum allowed length of a string value when parsing the JSON document
Pretty Print	Apply pretty print formatting to the output of the Jolt transform
Transform Cache Size	Compiling 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¶

Name	Description
failure	If the JSON transformation fails (e.g., due to invalid JSON in the content or attribute), the original FlowFile is routed to this relationship.
success	The FlowFile with successfully transformed content or updated attribute will be routed to this relationship

Writes attributes¶

Name	Description
mime.type	Always set to application/json