POST
/
v1beta
/
models
/
{model}
:generateContent
curl -X POST "https://api.example.com/v1beta/models/gemini-2.5-pro:generateContent?key=YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "contents": [
      {
        "role": "user",
        "parts": [
          {
            "text": "What is in this image?"
          },
          {
            "inline_data": {
              "mime_type": "image/jpeg",
              "data": "BASE64_ENCODED_IMAGE_DATA"
            }
          }
        ]
      }
    ]
  }'

{
  "candidates": [
    {
      "content": {
        "parts": [
          {
            "text": "This image shows a beautiful sunset over the ocean with vibrant orange and pink colors in the sky."
          }
        ],
        "role": "model"
      },
      "finishReason": "STOP"
    }
  ]
}
Official documentation: https://ai.google.dev/gemini-api/docs/image-understanding
Analyze and understand images using Google Gemini models. The model can describe images, answer questions about them, and extract information from visual content.

​
Request Parameters

​
key
string
required
API key.
​
contents
array
required
Content array containing text and image data.Each content object contains:
  • role (string): Role (user or model)
  • parts (array): Content parts array, can include:
    • text (string): Text prompt
    • inline_data (object): Image data
      • mime_type (string): Image MIME type (e.g., “image/jpeg”, “image/png”)
      • data (string): Base64-encoded image data
​
generationConfig
object
Generation configuration.
  • temperature (number): Sampling temperature
  • topP (number): Nucleus sampling parameter
  • maxOutputTokens (integer): Maximum output tokens

​
Response

Returns analysis and description of the provided image. 
curl -X POST "https://api.example.com/v1beta/models/gemini-2.5-pro:generateContent?key=YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "contents": [
      {
        "role": "user",
        "parts": [
          {
            "text": "What is in this image?"
          },
          {
            "inline_data": {
              "mime_type": "image/jpeg",
              "data": "BASE64_ENCODED_IMAGE_DATA"
            }
          }
        ]
      }
    ]
  }'

{
  "candidates": [
    {
      "content": {
        "parts": [
          {
            "text": "This image shows a beautiful sunset over the ocean with vibrant orange and pink colors in the sky."
          }
        ],
        "role": "model"
      },
      "finishReason": "STOP"
    }
  ]
}