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                     What is REST API?
Understanding, Navigating, and Testing REST APIs
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Introduction to REST API Explorer
 Definition: REST (Representational State Transfer) is an architectural style for 
designing networked applications.
 Key Concepts:
oUses HTTP methods (GET, POST, PUT, DELETE)
o Stateless interactions
o Resources identified via URLs
 Why REST APIs?
• Simple, scalable, and language-independent.
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What is REST API Explorer?
 Definition: A REST API Explorer is a tool/interface that allows 
users to interact with REST APIs directly from the browser.
 Purpose:
oDiscover available APIs
o Test endpoints
oUnderstand input/output formats
• Common Use Case: Developers and testers exploring and 
verifying API behavior.
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Key Features of a REST API Explorer
 Auto-generated documentation
 Interactive API testing (e.g., send requests, see responses)
 Authentication support (OAuth, API keys, etc.)
 Live data preview
• Request customization (headers, query params, body)
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Popular Tools & Platforms
 Swagger UI (OpenAPI): Most widely used; open 
source
 Postman (with collection viewer): Full-featured client 
and explorer
 Redoc: Clean and customizable documentation viewer
• API Explorer from Salesforce, Google Cloud: 
Platform-specific tools.
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How REST API Explorer Works
 Behind the Scenes:
o Reads OpenAPI/Swagger specs
oDisplays endpoints in structured format
o Sends real-time HTTP requests to server
o Renders responses with status codes, headers, and bodies
 Typical Flow:
o Select API
o Choose endpoint
o Enter parameters
o Click “Try it out”
o Review response.
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Benefits of Using REST API Explorer
 Fast Onboarding: Understand APIs quickly
 Reduced Errors: Avoid misformatted requests
 Time-Saving: No need for manual coding just to test
 Improved Collaboration: Share endpoints and 
usage with teams
• Better Documentation: Always up-to-date with 
real-time testability.
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When and Where to Use It
 During API Development (internal or external)
 For QA Testing and debugging
 In client onboarding and developer portals
• Learning and training for new developers
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Summary & Best Practices
 REST API Explorer is essential for interactive 
and transparent API testing.
 Always secure your API explorer (auth, CORS).
 Keep API specs up to date to ensure reliability.
• Pro Tip: Use OpenAPI specs + Swagger UI for 
full documentation + testing.
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