Response Models & Status Codes

When you make a request to an API, the server sends back a response. This response isn't just data; it also includes important information about the request's outcome.

FastAPI makes it easy to return data, usually as JSON. But we can make our APIs even better by being explicit about what data to expect and what happened.

Response models define the exact structure of the data your API will send back. This is crucial for several reasons:

• Data Consistency: Ensures your API always returns data in a predictable format.
• Automatic Docs: FastAPI automatically generates OpenAPI documentation showing the expected response structure.
• Data Validation: FastAPI can validate the outgoing data against your model, catching errors before sending.