Postman - The Collaboration Platform for API Development
tcpdump - tcpdump is a common packet analyzer that runs under the command line.
Ping-API - Automated API testing and monitoring.
SmartSniff - SmartSniff is a packet sniffer that capture TCP/IP packets and display them as sequence of conversations between clients and servers.
HTTPie for Terminal - Developers all around the world rely on HTTPie for API testing.
netcat - Netcat is a featured networking utility which reads and writes data across network connections...