curl --request POST \
  --url https://www.bls.gov/cpi/fetch \
  --header 'Content-Type: application/json' \
  --data '
{
  "INDEX_NAME": "CPI – All Urban Consumers – Midwest Region",
  "INDEX_CODE": "CUUR0200SA0",
  "INDEX_AS_OF": "02/11/2020",
  "INDEX_NEW": 101,
  "COUNTRY": "USA",
  "CREATION_DATE": "<string>",
  "CREATED_BY": "<string>"
}
'

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    INDEX_NAME: 'CPI – All Urban Consumers – Midwest Region',
    INDEX_CODE: 'CUUR0200SA0',
    INDEX_AS_OF: '02/11/2020',
    INDEX_NEW: 101,
    COUNTRY: 'USA',
    CREATION_DATE: '<string>',
    CREATED_BY: '<string>'
  })
};

fetch('https://www.bls.gov/cpi/fetch', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://www.bls.gov/cpi/fetch"

payload = {
    "INDEX_NAME": "CPI – All Urban Consumers – Midwest Region",
    "INDEX_CODE": "CUUR0200SA0",
    "INDEX_AS_OF": "02/11/2020",
    "INDEX_NEW": 101,
    "COUNTRY": "USA",
    "CREATION_DATE": "<string>",
    "CREATED_BY": "<string>"
}
headers = {"Content-Type": "application/json"}

response = requests.post(url, json=payload, headers=headers)

print(response.text)