[Python] Python: FastAPI error 422 with POST request when sending JSON data

I'm building a simple API to test a database. When I use GET request everything works fine, but if I change to POST, I get 422 Unprocessable Entity error.

Here is the FastAPI code:

from fastapi import FastAPI

app = FastAPI()

@app.post("/")
def main(user):
return user


Then, my request using JavaScript

let axios = require('axios')

data = {
user: 'smith'
}

axios.post('http://localhost:8000', data)
.then(response => (console.log(response.url)))


Also, using Python requests:

import requests

url = 'http://127.0.0.1:8000'
data = {'user': 'Smith'}

response = requests.post(url, json=data)
print(response.text)


I also tried to parse as JSON, enconding using utf-8, and change the headers, but nothing worked for me.

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