POST call is working fine in postman but gives error in node.js

I am new to node.js and i'm trying to make a post request to an external server(Oracle Commmerce Cloud) to export some data. PFA image screenshot of the request body in Postman (content-type: application/json) Request Body In Postman

When i am trying to make the same request using express in node then it throws me error. I am not sure if there's some other way to write body raw json of postman in node requests.

Below is my node request code

let req_body = JSON.stringify({
            "fileName": fileName,
            "mode": mode,
            "id": category,
            "format": format
        })


request.post(url, {
        data :{req_body},
        headers: {
            'Content-Type': 'application/json',
            'Authorization': `Bearer ${access_token}`
        }

    }, (error, res, body) => {
        if (error) {
            console.log('An error occured while loading the page', error)
            // console.error(error)
            return
        }
       console.log("export call:", res.statusCode)
        console.log("export call:", data)
    });

I get the below console error: -

export call: 400
export call: {
errorCode: '120001',
message: 'Invalid export input data',
status: '400'
}

Kindly help me to solve this issue.

I'm going to assume you're using request node module, but data are passing throught body params and not data, it will look like this :

request.post(url, {
    body: req_body,
    headers: {
        'Content-Type': 'application/json',
        'Authorization': `Bearer ${access_token}`
    }
}, (error, res, body) => {
    if (error) {
        console.log('An error occured while loading the page', error)
        // console.error(error)
        return
    }
   console.log("export call:", res.statusCode)
    console.log("export call:", data)
});