Insomnia is a GUI tool to help you communicating with an API. There are also other tools to do this, e.g. Postman or or the command line tool cURL.

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While it is quite similar to Postman, I found the UI to be less cluttered and therefore easier to use.

The usage is almost self explanatory.

You can install it via snap: sudo snap install insomnia or via package (on Ubuntu) Show archive.org snapshot .