Gpt-4-vision-preview: 400 Invalid base64 image_url

API
,
1

Im trying to use node.js to accept a base64 encoded image as a parameter and send that to openai api. Im sending a base64 encoded image in postman to the server like this:

{
  "base64Image": "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAw8AAAEoCAYAAAAe6s1xAAAA..."
}

and here is my code but it returns a 400 Invalid base64 image_url

async function imageToResponse(req, res) {
  const base64Image = req.body.base64Image;

  try {
    const response = await openai.chat.completions.create({
      model: 'gpt-4-vision-preview',
      messages: [
        { role: 'system', content: "you are a model to help identify everything in this image" },
        { role: 'user', content: [
          {
              type: "image_url", 
              image_url: 
              {
                "url": "data:image/png;base64,{base64Image}"
              }
            }
          ]
        },
      ],
    });

    console.log(response.data);
    res.status(200).json(response.data);
  } catch (error) {
    console.error('Error calling the OpenAI API:', error);
    res.status(500).json({ error: error.message });
  }
}
2

Be sure to search this forum for “base64”, because I remember someone having an issue with that which was easily solvable, but I can’t remember what the issue was.

3

Okay thank you. I’m having trouble finding someone that has the same issue im having. Im wondering if its the way im sending it in the post body from postman.

4

Maybe it’s expecting “detail” property like here:

EDIT: Also you could search thru GitHub for examples, or even just describe the method to ChatGPT itself and ask it to generate a complete working example code for you. When I’m stuck on something sometimes I just can describe the issue to ChatGPT and it will tell me what I’m doing wrong, or write the full code for me.