NIFI-15712 Add JSON Lines support to JoltTransformJSON#11001
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pvillard31 merged 2 commits intoapache:mainfrom Mar 13, 2026
Merged
NIFI-15712 Add JSON Lines support to JoltTransformJSON#11001pvillard31 merged 2 commits intoapache:mainfrom
pvillard31 merged 2 commits intoapache:mainfrom
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| final Object inputJson = jsonUtil.jsonToObject(line); | ||
| final Object transformedJson = TransformUtils.transform(transform, inputJson); | ||
| writer.write(jsonUtil.toJsonString(transformedJson)); | ||
| writer.newLine(); |
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I believe that in this case we need to use
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| writer.newLine(); | |
| writer.write('\n'); |
The JSON Lines specification mandates \n (0x0A) as the line separator. BufferedWriter.newLine() uses System.lineSeparator(), which is \r\n on Windows.
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Good catch, although both should work in general, the single character is correct, I will push a correction.
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Thanks @exceptionfactory , LGTM, merging
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Summary
NIFI-15712 Adds support for JSON Lines to the
JoltTransformJSONProcessor as a new option for theJSON Sourceproperty.Support for JSON Lines enables
JoltTransformJSONto process multiple JSON elements in a single FlowFile, reading, transforming, and writing each element with a newline delimiter.Although the
JoltTransformRecordProcessor supports similar handling with a configured JSON Record Reader and JSON Record Writer, record-oriented handling requires configured a Record Schema strategy. Supporting JSON Lines inJoltTransformJSONsupports widely varying JSON elements in a single FlowFile and avoids the need to specify or infer a Record Schema.Support for JSON Lines includes some restructuring for better code reuse in
JoltTransformJSON, along with new unit tests to verify expected behavior.Tracking
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