You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.

jsonmathpy
1.2.8

This version was deleted from PyPI around 2023-11-11. Installing fails with:
$ pip3 install jsonmathpy==1.2.8 ERROR: Could not find a version that satisfies the requirement jsonmathpy==1.2.8
View other deleted versions of jsonmathpy

Install through StableBuild

You can install this package from StableBuild's PyPI snapshots from before the version was deleted:
pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2023-11-10/ \ jsonmathpy==1.2.8
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Or, download files manually

And install manually via pip:
jsonmathpy-1.2.8-py3-none-any.whl (14.8KB)
jsonmathpy-1.2.8.tar.gz (10.3KB)