curl --request POST \
  --url https://api.sendrealm.com/project-operations/email_content_preview \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'X-Sendrealm-Project-Id: <x-sendrealm-project-id>' \
  --data '
{
  "editor_json": {
    "type": "doc",
    "content": [
      {
        "text": "<string>",
        "attrs": {},
        "marks": [
          {
            "attrs": {}
          }
        ],
        "content": "<array>"
      }
    ]
  },
  "subject": "<string>",
  "preview_text": "<string>",
  "require_subject": true,
  "require_unsubscribe": true,
  "auto_unsubscribe_footer": true
}
'

const options = {
  method: 'POST',
  headers: {
    'X-Sendrealm-Project-Id': '<x-sendrealm-project-id>',
    Authorization: 'Bearer <token>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    editor_json: {
      type: 'doc',
      content: [{text: '<string>', attrs: {}, marks: [{attrs: {}}], content: '<array>'}]
    },
    subject: '<string>',
    preview_text: '<string>',
    require_subject: true,
    require_unsubscribe: true,
    auto_unsubscribe_footer: true
  })
};

fetch('https://api.sendrealm.com/project-operations/email_content_preview', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.sendrealm.com/project-operations/email_content_preview"

payload = {
    "editor_json": {
        "type": "doc",
        "content": [
            {
                "text": "<string>",
                "attrs": {},
                "marks": [{ "attrs": {} }],
                "content": "<array>"
            }
        ]
    },
    "subject": "<string>",
    "preview_text": "<string>",
    "require_subject": True,
    "require_unsubscribe": True,
    "auto_unsubscribe_footer": True
}
headers = {
    "X-Sendrealm-Project-Id": "<x-sendrealm-project-id>",
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

{
  "status": 123,
  "data": {
    "html": "<string>",
    "text": "<string>",
    "diagnostics": [
      {
        "code": "<string>",
        "message": "<string>",
        "severity": "<string>",
        "path": "<string>"
      }
    ]
  }
}

{
  "status": 123,
  "error": {
    "code": "<string>",
    "message": "<string>",
    "details": "<string>",
    "issues": [
      {
        "code": "<string>",
        "path": "<string>",
        "message": "<string>"
      }
    ]
  }
}

{
  "status": 123,
  "error": {
    "code": "<string>",
    "message": "<string>",
    "details": "<string>",
    "issues": [
      {
        "code": "<string>",
        "path": "<string>",
        "message": "<string>"
      }
    ]
  }
}

{
  "status": 123,
  "error": {
    "code": "<string>",
    "message": "<string>",
    "details": "<string>",
    "issues": [
      {
        "code": "<string>",
        "path": "<string>",
        "message": "<string>"
      }
    ]
  }
}

{
  "status": 123,
  "error": {
    "code": "<string>",
    "message": "<string>",
    "details": "<string>",
    "issues": [
      {
        "code": "<string>",
        "path": "<string>",
        "message": "<string>"
      }
    ]
  }
}

{
  "status": 123,
  "error": {
    "code": "<string>",
    "message": "<string>",
    "details": "<string>",
    "issues": [
      {
        "code": "<string>",
        "path": "<string>",
        "message": "<string>"
      }
    ]
  }
}

{
  "status": 123,
  "error": {
    "code": "<string>",
    "message": "<string>",
    "details": "<string>",
    "issues": [
      {
        "code": "<string>",
        "path": "<string>",
        "message": "<string>"
      }
    ]
  }
}

{
  "status": 123,
  "error": {
    "code": "<string>",
    "message": "<string>",
    "details": "<string>",
    "issues": [
      {
        "code": "<string>",
        "path": "<string>",
        "message": "<string>"
      }
    ]
  }
}