Kong/insomnia · error · Error

failed to update body

Error message

failed to update body: ${e}

What it means

Wrapper error from mergeRequestBody: updating the request body (mimeType detection, text/params/file extraction) threw an unexpected exception, which is re-thrown with this prefix and the original error appended. Points at malformed body configuration on the updated request.

Solutions

1. Read the appended original error to identify the real cause
2. Simplify the request body update (mode, params, text) in the script
3. Verify body field types match the scripting API

When it happens

Trigger: Thrown at packages/insomnia-scripting-environment/src/objects/request.ts:676 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of Kong/insomnia@d9bb2b0142 (2026-08-26). Data as JSON: /api/errors/ed35ca80edec9ebe. Report an issue: GitHub.

Appendix: source

Thrown at packages/insomnia-scripting-environment/src/objects/request.ts:676

          : undefined;

    return {
      mimeType: mimeType,
      text: textContent,
      fileName: updatedReqBody?.file,
      params: updatedReqBody?.urlencoded?.map((param: QueryParam) => {
        return {
          name: param.key,
          value: param.value,
          type: param.type,
          fileName: param.fileName,
          multiline: param.multiline,
          disabled: param.disabled,
        };
      }, {}),
    };
  } catch (e) {
    throw new Error(`failed to update body: ${e}`);
  }
}

export function mergeRequests(originalReq: InsomniaRequest, updatedReq: Request): InsomniaRequest {
  const queryParamObjects = updatedReq.url.query.map(
    queryParam => ({
      name: queryParam.key,
      value: queryParam.value,
      disabled: queryParam.disabled,
    }),
    {},
  );
  const updatedReqProperties: Partial<InsomniaRequest> = {
    name: updatedReq.name,
    url: updatedReq.url.toStringWithoutQuery(),
    method: updatedReq.method,
    body: mergeRequestBody(updatedReq.body, originalReq.body),
    headers: updatedReq.headers.map(

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