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MTurk completion/survey code via JATOS: where are you?

Running a jsPsych-based study on JATOS/mindprobe through the MTurk sandbox, using the link as generated via the given source code pasted into the MTurk design page. Study runs nicely, with all the workerId, hitID and assignmentId params included in the URL for the "study link". Hoping to end up with a page displaying MTurk confirmation/completion/survey code, as seemingly promised in the JATOS guide. However, have yet to see it. So, can someone please advise of any further info about how this generated, the conditions for it to show? For example, is this dependent on the final event in the jsPsych "experiment.html" being of some particular type? Currently, script ends with a ""html-keyboard-response" component. Is there something that the script should NOT do to enable this confirmation code page to show, or some particular directive to make it show? (Also tried the endPage.html solution, but that's another story.)


  • Dear rvgardt,

    I'm sorry to hear that you weren't presented with a "page displaying an MTurk confirmation code ... as seemingly promised in the JATOS guide" and "However, have yet to see it". May I first ask which study link type (or worker type in older JATOS versions). Only the study link type "MTurk" will present a confirmation code in the end, after the study got finished.



  • Hello Kristian, thank you for your interest. From "Study Links", I'm using the provided source code for linking from MTurk. So, in publishing this study on the MTurk Sandbox, this neatly shows the link in the "Survey link" field on the HIT page once accepting the HIT. I then run the study from this link, in the Worker Sandbox -- going to, with the workerID, hitID and assignmentID showing in the URL. I complete the study. From what I read elsewhere in the JATOS guide and in this forum, I assumed that, at the end, a page would show presenting a completion/survey code. Maybe I've misunderstood. I can note that, in the meantime, I've made a workaround to show a random string anyway, with some additional information appended to it, that, although generated on the client-side, will serve the purpose. But if you can offer any enlightenment to the seeming blindspot I have about the JATOS-based process, that would be neat. Thank you.

  • I just tried with JATOS on Mindprobe (that has a version of 3.8.5) and I got a confirmation code in the end.

    Is it, maybe, that you specified a "End Redirect URL" in your study properties? That would prevent your study after finishing a run to show the page with the confirmation code. Instead it redirects you to the given URL and passes on the confirmation code as an URL query parameter.

    Another thing that comes to my mind: How do you finish your study? Do you use one of the jatos.js control flow functions, like jatos.endStudy or jatos.startNextComponent? Only if you use one of those functions JATOS will know of your intend to end the study run and can show you the confirmation code page.



  • Hello Kristian,

    Thank you -- that solved it -- using jatos.endStudy() as the on_finish function within jsPsych.init({}). Quite simple really, I just hadn't seen that used elsewhere. On "submitting the HIT" on MTurk Sandbox with that code pasted within the "survey code" box, I could duly see that code as the "MTurk confirmation code" on JATOS/mindprobe. All good. Thank you for your help.

  • Nice it worked!

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