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Using Prolific IDs in OSWeb experiment

edited March 4 in OSWeb

Edited to add:: oops I'm sorry I didn't know that Elisa moved over my previous question to the correct part of the Forum! As I cannot delete this post myself, feel free to do so!


I'm almost ready to run the experiment I've created in OSWeb on Prolific. I've uploaded it to our university's JATOS server, and it works fine from there (I've send people links and they work as well).

As I want to run it on Prolific, and they make use of huge ID numbers, I wanted to integrate these numbers right away, as is also indicated on the JATOS website and is explained (but for a different hosting site) on the Prolific site. However I have to admit that I'm a bit lost. In Prolific I can indeed find the URL Parameters, and I'd need the PROLIFIC_PID to register Prolific ID's I'd say.

However where I get stuck is what I now need to do to make sure that these parameters are accounted for. The JATOS site just says that "Then you can access those URL parameters in your study’s JavaScript via jatos.urlQueryParameters". I'm not quite sure how to do something like that? I assume that I would have to change it in my OSWeb file in some way? But I'm just not sure how to do this.

I also have another question related to Prolific IDs. Will they be treated as the subject number? I'm currently giving people a certain condition based on their participant number, but this is based on a number, not a combination of letters and numbers.

Kind regards,



  • Just add the following code to a java codeblock in your experiment:

    var prolific_id = jatos.urlQueryParameters.prolific_pid;

    vars.prolific_id = prolific_id;

    and make sure to save the variable 'prolific_id' in your logger.

    Then, when you input the experiment link in Prolific, add this to the end of the link:


  • Hi Sanne,

    Can you report back whether Jasper's response solves your problem? In the mean time, I will close the other discussion Elisa moved here. So, let's gather the information on that question in this discussion here.



    Buy Me A Coffee

  • Hi Eduard,

    Yeah of course! The current plan is to run the experiment at the end of this week/beginning of next week, so I'll let you know by then if it works!

    Kind regards,


  • Hi!

    It does indeed work! I didn't notice at first that the link that was given here differed from the one that they give in Prolific, so for others please indeed copy the link that Jasper provided!

    Kind regards,


  • All credits go to @Yavor for figuring this out btw!

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