Error when trying to upload an image to ImgBB

Question

I'm trying to upload images to ImgBB using NodeJS and GraphQL. I have a uploadImage mutation that takes an image in the form of a data url string, and goes as follows:

import parseDataUrl from "data-uri-to-buffer";

// ...

{
  Mutation: {
    async uploadImage(_, { dataUrl }) {
      const buffer = parseDataUrl(dataUrl); // https://www.npmjs.com/package/data-uri-to-buffer
      
      if (buffer.byteLength > 10 * 10 ** 6)
        throw new Error("The image exceeds the maximum size of 10 MB");

      const body = new FormData();
      body.append("image", buffer);

      const result = await fetch(
        `https://api.imgbb.com/1/upload?key=${process.env.IMGBB_KEY}`,
        {
          method: "post",
          headers: { ...body.getHeaders() },
          body
        }
      ).then<any>(result => result.json());

      if (!result.success || !result.url) {
        const msg = result.error?.message;
        throw new Error(
          `There was an error during upload${msg ? `: ${msg}` : ""}`
        );
      }
      return result.url;
    }
  }
}

body.getHeaders() contains:

{
    'content-type': 'multipart/form-data; boundary=--------------
------------656587403243047934588601'
  }

(I'm using node-fetch )

But no matter the combinations of query params, headers and body I use, I always end up getting this error:

  {
    status_code: 400,
    error: { message: 'Undefined array key "scheme"', code: 0 },
    status_txt: 'Bad Request'
  }

I can't find anything about it, do you have an idea?

Answer 1

There are multiple things you can do to resolve your issue.

1. Important thing with FormData, you need to explicitly provide a name for the image buffer if it's not already included, uploading without name API would throw the same error you have mentioned.

 body.append("image", buffer, "addSomeImageName.png");

2. The api does not require any header explicitly so you can remove it.

 { method: "post", headers: { ...body.getHeaders() }, // This can be removed. body }

3. The logic you are using to check for the result is faulty and would always throw error even if the result is successful.

 if (!result.success || !result.url) { // Check for success flag only. const msg = result.error?.message; throw new Error( `There was an error during upload${msg ? `: ${msg}` : ""}` ); }

This is the block I tested and is working fine:

 import parseDataUrl from "data-uri-to-buffer"; import fetch from 'node-fetch'; import FormData from "form-data"; async function uploadImage({ dataUrl }) { const buffer = parseDataUrl(dataUrl); if (buffer.byteLength > 10 * 10 ** 6) throw new Error("The image exceeds the maximum size of 10 MB"); const body = new FormData(); body.append("image", buffer, "someImageName.png"); const result = await fetch( `https://api.imgbb.com/1/upload?key=<your-api-key>`, { method: "post", // headers: { ...body.getHeaders() }, body } ).then(result => result.json()) // .then(data => { // console.log(data); // Working fine here too. // }); console.log("-------result--------\n", result); // Result is fine. // Logic testing. console.log(result.success); console.log(result.url); console.log(!result.success); console.log(!result.url); console.log(!result.success || !result.url); if (!result.success || !result.url) { const msg = result.error ? .message; console.log(`There was an error during upload${msg ? `: ${msg}` : ""}`) // throw new Error( // `There was an error during upload${msg ? `: ${msg}` : ""}` // ); } return result.url; } console.log("--------------------- console result ------------------------") console.log(uploadImage({ dataUrl: "data:image/gif;base64,R0lGODlhEAAQAMQAAORHHOVSKudfOulrSOp3WOyDZu6QdvCchPGolfO0o/XBs/fNwfjZ0frl3/zy7////wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH5BAkAABAALAAAAAAQABAAAAVVICSOZGlCQAosJ6mu7fiyZeKqNKToQGDsM8hBADgUXoGAiqhSvp5QAnQKGIgUhwFUYLCVDFCrKUE1lBavAViFIDlTImbKC5Gm2hB0SlBCBMQiB0UjIQA7" }));

Answer 2

One thing that seems odd to me:

const buffer = parseDataUrl(dataUrl); // https://www.npmjs.com/package/data-uri-to-buffer

The package in the comment only offers the function dataUriToBuffer , which you are not using. Are you using parseDataUrl from jsdom ? Are you using node-fetch's own implementation of FormData as supposed to according to the documentation ?

Please append your question with all relevant import statements and please also share the contents of body.getHeaders() .