Wikisource
xslt query parameter removal on /w/api.php
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On November 30, 2025, support for the query parameter xslt on the /w/api.php endpoint was removed. Calls to /w/api.php using this parameter now fail. The change removed support for format=xml with an xslt stylesheet across Wikimedia projects.
Calls it hits
/w/api.phpquery parameter xslt
What to use instead of these calls
Stop sending an XSLT stylesheet and transform the XML or JSON output client-side instead.
In Wikisource's words
Support for the format=xml&*xlst={stylesheet}* will be removed from Wikimedia projects by the end of November, 2025.
Facts
- API
- Wikisource
ar.wikisource.org - Kind
- Parameter removal
- Announced
- November 21, 2025
- Takes effect
- November 30, 2025
- Calls after that day
- Fail
- Source
- Announcement
- Last updated
- Verified
- , against Wikisource's own pages
Questions
When does this change take effect?
Calls to /w/api.php, query parameter xslt on Wikisource stopped working on November 30, 2025.
What happens to calls after November 30, 2025?
They have failed since November 30, 2025.
How do I find the calls this hits in my code?
Okapi reads your repository, finds the calls this change hits and opens a pull request with the fix. It never commits to your branches: every change comes as a pull request you review.
You fixed this one by hand.
Okapi opens the pull request with the fix before the next breaking change reaches your code.