FlattenJson 2025.10.2.19¶

Bundle¶

org.apache.nifi | nifi-standard-nar

Description¶

Provides the user with the ability to take a nested JSON document and flatten it into a simple key/value pair document. The keys are combined at each level with a user-defined separator that defaults to ‘.’. This Processor also allows to unflatten back the flattened json. It supports four kinds of flatten mode such as normal, keep-arrays, dot notation for MongoDB query and keep-primitive-arrays. Default flatten mode is ‘keep-arrays’.

Tags¶

flatten, json, unflatten

Input Requirement¶

REQUIRED

Supports Sensitive Dynamic Properties¶

false

Properties¶

Property	Description
flatten-json-character-set	The Character Set in which file is encoded
flatten-json-pretty-print-json	Specifies whether or not resulted json should be pretty printed
flatten-json-return-type	Specifies the desired return type of json such as flatten/unflatten
flatten-json-separator	The separator character used for joining keys. Must be a JSON-legal character.
flatten-mode	Specifies how json should be flattened/unflattened
ignore-reserved-characters	If true, reserved characters in keys will be ignored

Relationships¶

Name	Description
failure	Files that cannot be flattened/unflattened go to this relationship.
success	Successfully flattened/unflattened files go to this relationship.