FastAPI Basics: Path Parameters, Query Parameters and Request Body
?? Part 2/10 - Other Published Parts
Path parameters are one of the most common types of parameters that you can use in web APIs. They are used to define dynamic parts of the URL path that can vary depending on the user’s input. For example, if you have a web API that returns information about different products, you can use a path parameter to specify the product ID in the URL, such as https://example.com/products/123. In this case, 123 is the path parameter that represents the product ID.
Path parameters are useful for creating RESTful web APIs that follow a hierarchical structure of resources and subresources. They allow you to access and manipulate specific resources based on their identifiers. For example, you can use path parameters to create CRUD (Create, Read, Update, Delete) operations for your web API, such as GET /products/123 to read a product, POST /products to create a new product, PUT /products/123 to update a product, and DELETE /products/123 to delete a product.
However, path parameters also have some limitations and challenges. For instance, they are mandatory and positional, meaning that you have to provide them in the exact order and number that the web API expects. If you omit or change the order of the path parameters, you will get an error or a different result. Moreover, path parameters are usually limited to simple data types, such as integers or strings, and they cannot contain special characters or spaces. If you want to pass more complex or optional data to your web API, you will need to use other types of parameters, such as query parameters or request body parameters.
In the next sections, you will learn how to define and validate path parameters in FastAPI using Pydantic models. You will also see how to use path parameters to create a simple web API that returns information about different books. ...
? What are Path Parameters?
? How to Define Path Parameters in FastAPI
? How to Validate Path Parameters with Pydantic Models
? What are Query Parameters?
? How to Define Query Parameters in FastAPI
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? How to Validate Query Parameters with Pydantic Models
? What are Request Body Parameters?
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