Directus api create item works but data values are null - directus

Question

Using Directus online (https://projectcode.directus.app install of local or server install). I can successfully create item but data I send is always null.
This is happening running my code
axios.post(
`${endpoint}/items/collection_name`,
{ data: { "field_name": "testthis" } },
{ headers: headers }
);
And using Postman. Result is always
date_created: "2022-05-05T13:55:47"
id: 14
field_name: null
I can get items, search and filter with no issue. What am I missing?
ETA: Postman works with graphql and query
mutation {
create_collection_name_item(data: { field_name: "Hello again!" }) {
field_name
}
}
So why is api getting null values?
ETA 2: Postman api headers
Request
Authorization: Bearer the_very_long_token
User-Agent: PostmanRuntime/7.29.0
Accept: */*
Cache-Control: no-cache
Postman-Token: 45943ddb-5c60-4d45-8887-a05207f9469e
Host: k2g2xa7b.directus.app
Accept-Encoding: gzip, deflate, br
Connection: keep-alive
Content-Type: application/x-www-form-urlencoded
Content-Length: 13
Response
Content-Type: application/json; charset=utf-8
Content-Length: 135
Connection: keep-alive
Date: Mon, 09 May 2022 14:04:54 GMT
Access-Control-Allow-Credentials: true
Access-Control-Expose-Headers: Content-Range
Cache-Control: no-cache
Content-Security-Policy: script-src 'self' 'unsafe-eval';worker-src 'self' blob:;child-src 'self' blob:;img-src 'self' data: blob: https://cdn.directus.io;media-src 'self' https://cdn.directus.io;connect-src 'self' https://*;default-src 'self';base-uri 'self';block-all-mixed-content;font-src 'self' https: data:;frame-ancestors 'self';object-src 'none';script-src-attr 'none';style-src 'self' https: 'unsafe-inline'
Etag: W/"87-n/ABsgX1O7F1qQ7x0xdJgMV7VDc"
Server: Caddy
Vary: Origin, Cache-Control
X-Powered-By: Directus
X-Cache: Miss from cloudfront
Via: 1.1 dcd16c430149132ea12a5783d54ff114.cloudfront.net (CloudFront)
X-Amz-Cf-Pop: YTO50-P2
X-Amz-Cf-Id: Z19onMWqxvINuZ7iMQIJQeSRFrgW12a4gxZtcWPyubaWQCeaUnfLfA==

Answer 1

What headers do you provide? It seems that Content-Type is not determined automatically, so it may be as simple as including Content-Type: application/json in your headers.

Answer 2

in python:
import requests, json
token = 'your token'
headers = {
'Accept': 'application/json, text/plain, */*',
'Accept-Encoding': 'gzip, deflate, br',
'Accept-Language': 'en-US,en;q=0.5',
'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36',
'Content-Type': 'application/json',
'Authorization': f"Bearer {token}",
}
payload = [
{
"title" : "my first item",
}
]
r= requests.post(
url = "https://cms.uat.<your subdomain>.com/items/<your collection>",
data = json.dumps(payload),
headers = headers
)
print(r.json())