CheckcraftPostman for Linux: install with Snap or the archive, and Astra Linux
Postman ships two official Linux builds: a Snap package and an archive. Here is how to install each and where problems usually come from.
Snap: the easiest way
Postman recommends Snap because the package already includes the libraries it needs. The command below installs the app and adds it to the menu. Snap must be available on the system: Ubuntu has it by default; other distributions install it separately.
sudo snap install postmanThe tar.gz archive
Download the x64 or ARM64 archive from postman.com/downloads and unpack it with tar. The app runs from the unpacked folder. No menu shortcut is created; add one yourself with a .desktop file. If libraries are missing at startup, that is exactly why Postman recommends Snap.
tar zxf <downloaded archive>.tar.gzAstra Linux and locked-down environments
Postman does not list supported distributions and does not state Astra Linux support. If Astra Linux runs in closed software environment mode, programs without the required signature are restricted, and that is for your administrator to resolve, not to work around. On networks without internet access, Postman sign-in, sync and cloud features will not work.
Checkcraft for Linux
Checkcraft has a portable archive for Linux x64 with a desktop environment: unpack and run, no account or cloud. Verify it on your specific system, including Astra Linux: we do not claim certification for it.
Repeat this on your own API
Checkcraft is a desktop app that saves API response checks without code and shows what did not match. Start with a sample, then use your own sanitized data. Free runs on Windows and Linux with no time limit.
Download FreeDownload and first runNo sign-up or email needed, the archive is ready in a couple of minutes. See the edition limits.
References
Start with the linked example and compare its result with your own test requirement.