The “string” argument must be one of type string, Buffer, or ArrayBuffer. Received type object

Question

Getting this error in the given code. I am calling this method on file upload and it is going to catch block.

ERR: TypeError [ERR_INVALID_ARG_TYPE]: The "string" argument must be one of type string, Buffer, or ArrayBuffer. Received type object

        try{
          request
            .post(url)
            .set(postHeaders)
            .send(postData)
            .end(function (err, response) {
                if(err) {
                    console.log(err);
                    res.send(errorJson);
                    return;
                }
                res.set(response.header);
                res.send(response.text);
            });
          } catch(err){
              console.log("error" , err)
          } 

The header is

'content-type': 'multipart/form-data;'

Answer 1

From the looks of it you are using superagent to perform the upload. Since you're intending to do a multipart/form-data upload, you cannot use .send() . From the docs :

Multipart requests SuperAgent is also great for building multipart requests for which it provides methods.attach() and.field().

When you use.field() or.attach() you can't use.send() and you must not set Content-Type (the correct type will be set for you)

So you need to change your code to:

request
       .post(url)            
       .field(<setYourFieldDataHere>) // or use .attach() if you want to upload files
       //