Using the built in NodeJs fetch client does not have the same return type.

iii-james

I am upgrading my app and going to use the built in http client 'fetch'. I have been using the request library that is now deprecated. I am having an issue with what 'fetch' returns from JsReport. I am getting a string so when 'response.json()''' is called I get error 'Unexpected token '%', "%PDF-1.6\n%"... is not valid JSON'. When I call the same url with 'request' I get an object. It seems like 'fetch' only returns the content of the body property. Is anyone having a similar issue?

request code:

    const promise = new Promise<any>((resolve, reject) => {
      const options = {
        json: data,
        uri: 'http://jsreport.innovationind.com/api/report'
      };
      post(options, (err, result) => {
        if (err) {
          return reject(err);
        }
        resolve(result);
      });
    });
    return promise;

fetch code:

    try {
      const response = await fetch('http://jsreport.innovationind.com/api/report', {
        method: 'POST',
        headers: {
          'Accept': 'application/json',
          'Content-Type': 'application/json'
        },
        body:JSON.stringify(data)

      });

      if (response.ok && response.body) {
        const body = await response.json(); //error occurs here
        return body;
      } else {
        throw new Error('Failed to fetch the report');
      }
    } catch (error: any) {
      logger.error(error);
      return Promise.resolve(error);
    }

admin

The response is a binary stream containing the report content and not a json, therefore the response.json won't work and fail on json parsing error.

I don't know what you want to do with the output afterward, but you can use for example await response.arrayBuffer()

iii-james

@admin I think I get it now. I am able to recreate what my client was expecting with the following code. It needed a body property with the data and a headers property with a permanent-link property. Thanks

const body = await response.text();
const permanentLink = await response.headers.get('permanent-link');
return {data:{body,headers:{'permanent-link':permanentLink}}};