No Postman, Just GetCat!

Seven methods

Write {name} anywhere in the URL and it shows up in the path parameter table automatically.

Bodies and parameter tables

No body

For GET, HEAD and OPTIONS.

Raw JSON / Text / XML

Syntax-highlighted via tree-sitter, with a one-click reformat button.

x-www-form-urlencoded

Key-value pairs, encoded for you.

form-data

Text and file fields side by side. Files are streamed with a known length and never read into memory.

Binary

A whole file as the body, streamed the same way.

Path parameters

Filled in from {name} placeholders in the URL.

Query

Appended to the URL, with per-row enable toggles.

Headers

Plus a global default-header set you can switch off row by row.

Generate code

cURL, cURL for Windows cmd, or Python requests — copied with one click. The generator reuses the very same assembly logic that sends the request, so the code you copy is the request GetCat would have made.

curl -X POST 'https://api.anthropic.com/v1/messages' \
  -H 'x-api-key: YOUR_API_KEY' \
  -H 'anthropic-version: 2023-06-01' \
  -H 'Content-Type: application/json' \
  -d '{"model":"claude-opus-5","max_tokens":1024,"messages":[{"role":"user","content":"Hello"}]}'

import requests

url = "https://api.anthropic.com/v1/messages"

payload = "{\"model\":\"claude-opus-5\",\"max_tokens\":1024,\"messages\":[{\"role\":\"user\",\"content\":\"Hello\"}]}"
headers = {
    "x-api-key": "YOUR_API_KEY",
    "anthropic-version": "2023-06-01",
    "Content-Type": "application/json"
}

response = requests.request("POST", url, data=payload, headers=headers)

print(response.text)

It deliberately leaves out TLS, redirect and timeout options: those are GetCat settings, not part of the request itself.

The same image request, three ways

{
  "model": "gpt-5.6",
  "messages": [
    {
      "role": "user",
      "content": [
        { "type": "text", "text": "What is in this image?" },
        {
          "type": "image_url",
          "image_url": {
            "url": "https://example.com/cat.jpg",
            "detail": "auto"
          }
        }
      ]
    }
  ],
  "max_completion_tokens": 1024
}

{
  "model": "gpt-5.6",
  "input": [
    {
      "role": "user",
      "content": [
        { "type": "input_text", "text": "What is in this image?" },
        {
          "type": "input_image",
          "image_url": "https://example.com/cat.jpg"
        }
      ]
    }
  ],
  "max_output_tokens": 1024
}

{
  "model": "claude-opus-5",
  "max_tokens": 1024,
  "messages": [
    {
      "role": "user",
      "content": [
        {
          "type": "image",
          "source": {
            "type": "url",
            "url": "https://example.com/cat.jpg"
          }
        },
        { "type": "text", "text": "What is in this image?" }
      ]
    }
  ]
}