The best alternatives to Firecracker are Postman, Slack Platform, and Dadroit JSON Viewer. If these 3 options don't work for you, we've listed a few more alternatives below.
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Postman is the world’s leading API platform, used by more than 30 million developers and 500,000 organizations worldwide for building and managing APIs.
Postman enables teams to efficiently collaborate at every stage of the API lifecycle while prioritizing quality, performance, and security.
Discover what the platform makes possible & recent API changes. Status updates SlackStatus.
Slack Technologies, Inc. is an American software company founded in 2009 in Vancouver, British Columbia, Canada.
Dadroit is a tool that treats JSON as a Data format, not a plain text. It provides you quick outline view with the help of tree representation of JSON Data from root to last nodes. You can browse and query JSON like an enterprise DBMS.
Meet Mocklets, a HTTP-based mock API simulator, which helps simulate APIs for faster parallel development and more comprehensive testing.
Mocklets enables you to stay productive when an API you depend on doesn't exist or isn't complete. It supports testing of edge cases and failure modes that the real API won't reliably produce.
Blazing fast, modern, lock-in-free web apps without ever having to manage a single server. Now with AWS HTTP APIs and support for all modern JavaScript test harnesses.