I have

https://community.openproject.org/api/v3/projects/?filters=[{%22active%22:{%22operator%22:%22=%22,%22values%22:[%22true%22]}}]

But it is giving me this error: Filters Active filter has invalid values

I have tried a one as well in the value... what do I have wrong?

https://community.openproject.org/api/v3/projects/?filters=[{%22active%22:{%22operator%22:%22=%22,%22values%22:[%22t%22]}}]

is how I got it to work