Path & Query Params in FastAPI | Video 4 | CampusX

About this video

• Video Title: Path & Query Params in FastAPI | Video 4 | CampusX
• Channel: CampusX
• Speakers: Nitesh
• Duration: 41:12

Overview

This video, the fourth in a FastAPI playlist, focuses on two core concepts: Path Parameters and Query Parameters. The presenter, Nitesh, explains how to use these parameters to create dynamic and interactive API endpoints, demonstrating with practical code examples within a project context. The video also touches upon HTTP status codes and how to handle errors gracefully using FastAPI's built-in exceptions.

Key takeaways

• Path Parameters: These are dynamic segments of a URL path used to identify specific resources. They are essential for operations like retrieving, updating, or deleting a particular item.
• Code Demo for Path Parameters: The video demonstrates creating an endpoint that accepts a patient ID in the URL to fetch a specific patient's data from a JSON file.
• Path Function: This FastAPI utility enhances path parameters by allowing the addition of metadata, validation rules, and documentation hints like descriptions and examples, improving API endpoint readability.
• HTTP Status Codes: These three-digit codes indicate the result of a client's request (e.g., 200 for success, 404 for not found, 400 for bad request, 500 for server error).
• HTTPException: FastAPI's built-in exception class allows for raising custom HTTP error responses with specific status codes and detail messages, improving error handling.
• Query Parameters: These are optional key-value pairs appended to a URL after a question mark, used for operations like filtering, sorting, searching, and pagination without altering the endpoint path itself.
• Code Demo for Query Parameters: The video shows how to create an endpoint to sort patient data by criteria like weight, height, or BMI, with options for ascending or descending order, utilizing query parameters.
• Query Function: Similar to the Path function, Query in FastAPI allows for declaring, validating, and documenting query parameters, including setting default values and validation rules.