Create Card API Failure

[SahilSingla]

I am working on a tamper monkey script from Gmail Integration. I am able to load boards I am part of, not create card request fails with 422 error. But the same request works via curl.

REQ POST https://app.fizzy.do/app-id/boards/board-id/cards
REQ BODY {card: {title: 'Presenting VIP as our new lifestyle partner', description: 'From: members@x.y.com'}

RES_HEADERS
cf-cache-status:DYNAMIC
cf-ray:9b79c6a4c8bb4bda-DEL
content-length:46
content-type:application/json; charset=UTF-8
date:Fri, 02 Jan 2026 11:04:30 GMT
server:cloudflare
strict-transport-security:max-age=63072000; includeSubDomains
vary:Accept-Encoding
x-cache:bypass
x-request-id:f8f74bcf-b9df-4896-a775-f728193ad1ec
x-runtime:0.009551

RES_BODY {"status":422,"error":"Unprocessable Content"}

CURL
curl -i -X POST
https://app.fizzy.do/app-id/boards/board-id/cards
-H "Authorization: Bearer TOKEN"
-H "Accept: application/json"
-H "Content-Type: application/json"
-d '{
"card": {
"title": "Test card from curl",
"description": "Created via Fizzy API curl test"
}
}'

[robzolkos]

Hey @SahilSingla - The issue is with your request body JSON syntax. In your Tampermonkey script, you're sending:

{card: {title: 'Presenting VIP as our new lifestyle partner', description: 'From: members@x.y.com'}

This isn't valid JSON - JSON requires double quotes for both keys and string values (single quotes aren't valid), and you're also missing a closing brace.

Make sure you're using JSON.stringify() on your request body:

  body: JSON.stringify({
    card: {
      title: "Presenting VIP as our new lifestyle partner",
      description: "From: members@x.y.com"
    }
  })

Your curl works because you wrote valid JSON manually with double quotes in the -d parameter.