NodeJS - ERR_INVALID_ARG_TYPE Error thrown while issuing a HTTP request to remote host

Recently, I encountered a problem while trying to issue a request using NodeJS and request-promise.

The following code is nested inside a multer call for file uploading (using nested functions / clusters.

    const options = {
        method: 'POST',
        uri: 'URL of your choice',
        body: {
            //Body of the request
        },
        // json: true,
        headers: {
            // 'Content-Type': 'application/x-www-form-urlencoded',
        },
    }

    request(options)
        .then(function (response) {
            console.log('Response: ', response);

        })
        .catch(function (err) {
            console.log('Error: ', err);
        });

While using the current request, without the 'json: true' property (commented out), I get the following error:

TypeError [ERR_INVALID_ARG_TYPE]: The first argument must be one of type string or Buffer. Received type object
    at write_ (_http_outgoing.js:603:11)
    at ClientRequest.write (_http_outgoing.js:575:10)
    at Request.write (PATH/node_modules/request/request.js:1500:27)
    at end (PATH/node_modules/request/request.js:549:18)
    at Immediate.<anonymous> (PATH/node_modules/request/request.js:578:7)
    at runCallback (timers.js:696:18)
    at tryOnImmediate (timers.js:667:5)
    at processImmediate (timers.js:649:5)
    at process.topLevelDomainCallback (domain.js:121:23)

And when I turn the 'json: true' option on, the problem doesn't occur, but the remote API returns an error as it doesn't handle JSON requests/their added curly braces well.

Any ideas about getting over this issue?

Thank you.

Solved it!
As the remote host doesn't handle JSON well, and required "ordinary" POST request to be sent, I looked again inside request-promise's documentation. By changing body{} to formData{}, and commenting out json: true, the problem was solved.

const options = {
    method: 'POST',
    uri: 'URL of your choice',
    formData: {
        //Request's data
    },
}

request(options)
    .then(function (response) {
        console.log('Response: ', response);

    })
    .catch(function (err) {
        console.log('Error: ', err);
    });