Postman can do this as well. I've been using this a bunch recently due to some project limitations and it has made life so much easier.
ETA: I just tried the functionality on Insomnia and I have to admit the UX is nicer. Just paste into the URL bar. Whereas with Postman it's CMD+O, Click on "Raw Text", click in textarea, paste, press import. Insomnia looks to have added OpenAPI support too (it was missing it last time I played with it) so maybe it's time to re-evaluate Insomnia
I don't disagree. I've just been using it for so long (8 or 9 years now I think) and it's so ingrained in my workflows that I haven't bothered to re-evaluate it in ages. This is probably the kick in the butt I needed.
The world is your oyster, my friend. Restfox is pretty similar to Insomnia, which is what I use, so I'll probably give Restfox a shot and see about hosting my own instance on the LAN.
ETA: I just tried the functionality on Insomnia and I have to admit the UX is nicer. Just paste into the URL bar. Whereas with Postman it's CMD+O, Click on "Raw Text", click in textarea, paste, press import. Insomnia looks to have added OpenAPI support too (it was missing it last time I played with it) so maybe it's time to re-evaluate Insomnia