Why can't I access the Error body? #1401

403-html · 2025-09-12T07:21:23Z

403-html
Sep 12, 2025

[SOLVED]

Turns out when catching error from Api class, now the error is in other place

const payload = e?.error; // it will hold the parsed JSON which usually is in axios response's body
const status = e?.status;
const traceId = e?.headers?.get?.("traceid");

Hi, I have a question regarding error handling in the API response. When we encounter an error, we receive an Error object, but I can't access the body of the response. If bodyUsed is set to true, it suggests that the body has been processed (during "normal" axios/fetch call it's not touched), yet I can't find any error details and where it was processes.

Here's the code I'm using:

const api = new Api({
      baseUrl: "our-url",
      baseApiParams: { format: "json" },
});

const newItem = {...}
try {
      await api.items.setItem(newItem)
} catch (e) {
      throw e;
}

The response I get is:

Response {
      status: 400,
      statusText: 'Bad Request',
      headers: Headers {
        'content-length': '111',
        'content-type': 'application/json',
        date: 'Thu, 11 Sep 2025 13:07:37 GMT',
        traceid: '0228392e-33c2-454c-bc6f-3b3d261186ae',
        vary: 'Origin'
      },
      body: ReadableStream { locked: true, state: 'closed', supportsBYOB: true },
      bodyUsed: true,
      ok: false,
      redirected: false,
      type: 'basic',
      url: 'our-url/items'
    }

I understand that in a plain axios/fetch we aren't calling response.json() before inspecting the Response, so bodyUsed stays false. Here, the generated client calls it for us (because I set format: 'json' during init), so the body is consumed earlier. Is there a way to access the error details (because when I do manually send "wrong" params/body to endpoint I get properly an error in web swagger)? Any insights would be greatly appreciated.

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403-html Sep 12, 2025

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403-html
Sep 12, 2025