# JSON parse error, original data now in message field {:message=\>"Could not set field 'original' on object '' to value '{\\"event\\": \\"\\"}'

**URL:** <https://discuss.elastic.co/t/json-parse-error-original-data-now-in-message-field-message-could-not-set-field-original-on-object-to-value-event/337740>\
**Category:** Logstash\
**Created:** [July 6, 2023, 4:09am UTC](https://discuss.elastic.co/t/json-parse-error-original-data-now-in-message-field-message-could-not-set-field-original-on-object-to-value-event/337740 "2023-07-06T04:09:53Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![cosmosir](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/cosmosir/32/123113_2.png) [@cosmosir](https://discuss.elastic.co/u/cosmosir)\
**Post date:** [July 6, 2023, 4:09am UTC](https://discuss.elastic.co/t/json-parse-error-original-data-now-in-message-field-message-could-not-set-field-original-on-object-to-value-event/337740/1 "2023-07-06T04:09:53Z")

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logstash8.8.1

JSON parse error, original data now in message field {:message=\>"Could not set field 'original' on object '' to value '{"event": ""}'.This is probably due to trying to set a field like [foo][bar] = someValuewhen [foo] is not either a map or a string", :exception=\>Java::OrgLogstash::Accessors::InvalidFieldSetException, :data=\>"{"event": ""}"}

if source is {"event":{}} ,it's ok. can I use the 'event' as string ?

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [August 3, 2023, 4:10am UTC](https://discuss.elastic.co/t/json-parse-error-original-data-now-in-message-field-message-could-not-set-field-original-on-object-to-value-event/337740/2 "2023-08-03T04:10:34Z")

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