Thanks for the prompt reply Sviva and Jake! Sviva Manager I'm not sure I understand what you mean. I am curious if there is another area of code that needs to be altered to recognize the definitionExpression parameter. I totally missed the comma, thanks for pointing that out. jskinner-esristaff The data being accessed through a hosted ArcGIS Online feature service. The query I'm trying to write scans the GPS_Date field, and returns only those values that have occurred in the last 91 days, to avoid inflation. This is my first time taking a dip into JSON, but from everything I've read the single line should be enough to apply the definition query. Thanks for helping me out!
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