Back to All Questions
Question 27 of 100
Intermediate API Testing
Intermediate
Q27: What is Basic Authentication? How do you Implement it in Postman?
🛡️Core Concept
What is Basic Authentication? How do you Implement it in Postman?
Key Takeaways & Architecture Summary
- ✓Transmits credentials as a Base64-encoded string: Authorization: Basic <encoded>.
- ✓Postman handles base64 encoding automatically under the Authorization tab.
- ✓Decodes in-transit to: username:password.
Direct Answer Summary
Basic Authentication is a straightforward security scheme built into the HTTP protocol. The client sends credentials formatted as `username:password`, encoded in Base64, within the `Authorization` header. In Postman, you select "Basic Auth" in the Authorization tab, enter your username and password, and Postman automatically base64-encodes the credentials.
⚠️ Senior Engineering Warning (Red Flag)
Avoid using Basic Auth for modern public client integrations. Exposing raw passwords to client apps creates security vulnerabilities. Use temporary Bearer tokens instead.
💡 STAR Architectural Explanation & Pro Tip
Because the raw password is sent on every single API request, Basic Authentication must always be combined with SSL/TLS (HTTPS) to prevent interception by intermediate network sniffers.
RestAssuredTest.java
Rest-Assured + Java// Postman pre-request script equivalent of Basic Authentication header injection
const username = "admin";
const password = "password123";
const hash = btoa(username + ":" + password); // JavaScript Base64 encoding
pm.request.headers.add({
key: "Authorization",
value: "Basic " + hash
});