New server-side error when saving data to Pavlovia, no recent code changes

[isaack]

Hi all,

We are encountering a new error on our jsPsych project that has been running since April 2024. There have been no recent changes to the repository code - the last change (aside from the automated result uploads) was 11 months ago, and data was last successfully saved 3 weeks ago.

Are there new server-side changes that we need to conform to?

jsPsych version 7.3.4

jspsych-pavlovia plugin version 2022.1.1

Greatly appreciate any insight or assistance you are able to provide!

{“origin”: “https://pavlovia.org/api/v2/experiments/366049/sessions/76ea04b4-9e3e-400e-a08f-48a298c86f50/results”, “context”: “when saving data from a previously opened session on the server”, “projectId”: 366049, “sessionToken”: “76ea04b4-9e3e-400e-a08f-48a298c86f50”, “session”: {“sessionToken”: “76ea04b4-9e3e-400e-a08f-48a298c86f50”, “pathWithNamespace”: “ucsf-math/multitudes”, “status”: “OPEN”, “startTime”: “2026-01-09 21:06:28”, “pilotToken”: null, “gitlabId”: 366049, “experimentStatus”: “RUNNING”, “experimentPlatform”: “UNKNOWN”, “experimentRunMode”: “CREDIT”, “dataUploadTimestamps”: [“2026-01-09 21:07:56”]}, “error”: “unable to JSON decode the value: Extra data: line 1 column 10 (char 9)”, “errorCode”: null, “httpStatusCode”: 500}

Isaac

[wakecarter]

Have you accidentally switched saving to Database from CSV?

Jspsych-pavlovia plugin 3.0.0 error saving data

So I thought I had changed the save format from DATABASE back to CSV. I guess it’s not super clear which option is selected and which is deselected on the experiment page in Pavlovia. Changing the save format to CSV solved the problem. You can double check which option you’re using by looking at the Saving Format column of the Dashboard. I’ll keep this here in case anyone else has the same issue.

[isaack]

Thank you - changing from Database to CSV resolved the issue!