HTTPie

HTTPie is an open-source HTTP client for developers, QA engineers, and API testers who need a more readable way to test and debug REST APIs and HTTP servers from the terminal or a GUI.

Key capabilities include:

• Expressive request syntax for composing HTTP methods, URLs, query params, headers, and request bodies with minimal ceremony
• Formatted, colorized output that makes responses easier to scan while debugging status codes, headers, and payloads
• Built-in JSON support, plus forms and file uploads, for common API testing workflows
• HTTPS, proxies, authentication, and persistent sessions for working with protected endpoints and repeatable test runs

Pricing: Freemium. The CLI is free and open-source; HTTPie for Web and Desktop requires beta access signup.

What makes it notable: it focuses on human-friendly API interaction with readable commands and terminal output, while also offering Web and Electron-based Desktop apps for teams that prefer a graphical API testing client, including use cases such as testing APIs behind corporate proxies.