I want to automatically leave the contents of ajax communication on the open page of my browser in the local file.

const supplier=require('puppeter');

(async() = > {
    const browser = wait supplier.launch({headless:false, defaultViewport:null});
    const page=(wait browser.pages())[0];
    try{
        const client=wait page.target().createCDPSession();
        wait client.send('Fetch.enable', {'patterns':[{'urlPattern':'*', 'requestStage':'Response'}] });
        client.on('Fetch.requestPaused', async(requestEvent)=>{
            const {requestId, responseStatusCode, responseHeaders} = requestEvent;
            try{
                if(!responseStatusCode)throw`responseStatusCode:${responseStatusCode}`;
                const response = wait client.send('Fetch.getResponseBody', {requestId});

                // dump response body
                if(response.base64Encoded){
                    console.log(new Buffer(response.body, 'base64').toString('utf-8'));
                } else{
                    console.log (response.body);
                }

                wait client.send('Fetch.fullRequest', {requestId, responseCode:responseStatusCode, responseHeaders, 'body':response.body});
            } catch{
                wait client.send('Fetch.continueRequest', {requestId});
            }
        });

        // wait for close
        wait new Promise((resolve, reject)=>page.on('close',resolve));
    } US>finally
        (await browser.pages()) .forEach(p=>p.close());
        browser.close();
    }
})();

import mitmproxy
def response (flow):
    if flow.request.pretty_url.startswith("https://www3.nhk.or.jp/news/special/coronavirus/data/") and flow.response.headers ["content-type"].startswith("application/json"):
        with open("responses.txt", "ab") asf:
            f.write(flow.response.content)

mitmdump-save_body.py