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https://issues.apache.org/jira/browse/NIFI-10612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17689912#comment-17689912
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Daniel Stieglitz commented on NIFI-10612:
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[~exceptionfactory] I do not see isJson on on NIFI Expression Language
[documentation
page|https://nifi.apache.org/docs/nifi-docs/html/expression-language-guide.html]
> Create new Expression Language method isJson to determine whether an
> attribute is JSON
> --------------------------------------------------------------------------------------
>
> Key: NIFI-10612
> URL: https://issues.apache.org/jira/browse/NIFI-10612
> Project: Apache NiFi
> Issue Type: New Feature
> Components: Core Framework
> Reporter: Daniel Stieglitz
> Assignee: Daniel Stieglitz
> Priority: Major
> Fix For: 1.19.0
>
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> Create a new Expression Language method isJson to determine whether
> attributes are JSON or not. The addition of this method provides a short
> circuit of failure before attempting a JsonPath which otherwise would result
> in flow files yielding if the attribute is not JSON as detailed in NIFI-10396
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