Test Data can generate all sorts of randomized data including
Text, UUID, Numbers, Date & Time, and Custom types such as popular ones like JSON, CSV, and SQL
The plugin adds a context action 'Test Data' to generate data
RestFulTool - IntelliJ IDE Plugin
RestFulTool offers a window to make REST API calls all from
IDE
The plugin provides a bunch of tools for Restful Service development
It has great integration support for Spring MVC and Spring Boot
HTTP Client - IntelliJ IDE Plugin
HTTP Client helps to create, edit, and
execute HTTP requests directly in the IntelliJ IDEA code editor.
It provides varies features like configuring env variable file with support for environments like dev, qa and live.