A FastAPI app in Python

A decorated function is an endpoint; the return value becomes JSON.

from fastapi import FastAPI
from fastapi.testclient import TestClient

app = FastAPI(title="typestar")


@app.get("/healthz")
def healthz():
    return {"status": "ok"}


@app.get("/langs")
def langs():
    return ["python", "rust", "sql"]


client = TestClient(app)
print(client.get("/healthz").json())
print(client.get("/langs").status_code, client.get("/langs").json())

How it works

1. The decorator carries the method and the path.
2. A dict or a model is serialized for you.
3. TestClient calls the app without a server.

Keywords and builtins used here

• def
• healthz
• langs
• print
• return

The run, in numbers

Lines

19

Characters to type

364

Tokens

117

Three-star pace

110 tpm

At the three-star pace of 110 tokens a minute, this run takes about 64 seconds.

Type this snippet

Step 1 of 4 in FastAPI routes, step 6 of 19 in Web services & data access.

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