Insomnia is an application for using, designing, and debugging REST APIs. Users can interactively assemble API requests with Insomnia's graphical request builder, issue them, and then view the responses with a graphical response explorer. Response data can be sliced and diced using JsonPath or XPath, then exported in a number of formats. Insomnia understands most popular authentication schemes...

Postman is a tool for working with REST APIs that describes itself as an API Development Environment. It can be used to interactively test API requests in the process of building software. For example, Postman can be used to test requests that pull data from the Internet Archive's Open Library Books API, to manually explore data available from an OAI-PMH server, or to interact with the Digital...