topic Re: Unable to sync offline edits in ArcGIS Field Maps Questions

Unable to sync offline edits

Alison_Mynsberge — Fri, 10 Apr 2026 15:41:55 GMT

Using iOS devices and Field Maps 26.1.1, we have been unable to sync edits made offline. The errors are "Invalid JSON: The supplied JSON could not be parsed" which is also the general extent of the information we get from verbose logs.

Verbose logs are generally:

Preparing to sync 1 geodatabase

Sync geodatabase: Failed: "Job error 21 Invalid JSON. The supplied JSON could not be parsed."

Layer result: Sync failed. Name: ..... The supplied JSON could not be parsed.

Table result: Sync failed. ... The supplied JSON could not be parsed.

I wish the verbose logs included the JSON!

Re: Unable to sync offline edits

Alison_Mynsberge — Fri, 10 Apr 2026 15:50:50 GMT

The goal is to edit a table related to the feature class. We're able to edit from field maps without any trouble when online.

Re: Unable to sync offline edits

DougBrowning — Fri, 10 Apr 2026 18:25:22 GMT

Is this Portal? We have been seeing this setting here getting turned on by default now in Portal and we have to turn it off. Not sure why its suddenly doing that. It caused what you are seeing can edit online but not offline.

Hope that is it

Re: Unable to sync offline edits

ChristopherCounsell — Sat, 11 Apr 2026 00:04:41 GMT

I believe error code 21 is field type, like the below:

https://support.esri.com/en-us/knowledge-base/error-arcgis-field-maps-domain-com-esri-arcgis-runtime--000031889

Are you using date or time only fields? Or these arcade functions?

Otherwise need more info. Can narrow it down by testing new layers to isolate it to the fields, offline, relationship, map design etc

Re: Unable to sync offline edits

DanielFox1 — Mon, 13 Apr 2026 09:48:29 GMT

@Alison_Mynsberge

I would look at the link above from Christopher it highlights the error perfect and the next steps. If you want to keep the data you have edited I would recommend following this workflow to extract the changes from the device then make any changes outlined in the above doc

https://support.esri.com/en-us/knowledge-base/how-to-access-offline-edits-from-arcgis-field-maps-dire-000026799