parse various section of a HAR file. uses nodejs

harhar.js

const fs = require('fs');

function readHarFile(filePath) {
    fs.readFile(filePath, 'utf8', (err, data) => {
        if (err) {
            console.error('Error reading the file:', err);
            return;
        }
        const harData = JSON.parse(data);
        analyzeHarData(harData);
    });
}

function analyzeHarData(harData) {
    const entries = harData.log.entries;
    const totalWaitTime = entries.reduce((acc, entry) => acc + entry.timings.wait, 0);
    
    let totalGetWaitTime = 0, totalPostWaitTime = 0;
    let startTimes = [];
    let postCallsInfo = [];
    let requestTimes = [{endpoint: '', time: 0, method: '', payloadSize: 0}]


    entries.forEach(entry => {
        if (entry.request.method === 'GET') {
            totalGetWaitTime += entry.timings.wait;
            postCallsInfo.push(extractPOSTDataFactory(entry));
            requestTimes.push({endpoint: entry.request.url, time: entry.time});
        } else if (entry.request.method === 'POST') {
            totalPostWaitTime += entry.timings.wait;
            postCallsInfo.push(extractPOSTDataFactory(entry));
            requestTimes.push({endpoint: entry.request.url, time: entry.time, method: entry.request.method, payloadSize: entry.request.postData.text.length});
        }
        startTimes.push(entry.startedDateTime);
    });

    let start = new Date(startTimes.shift(0));
    let end = new Date(startTimes.pop());
    let harDurationMilliseconds = end - start;
    let harDurationMinutes = harDurationMilliseconds / 60000;
    let metaData = {
        "metaData": {
            "startTime": start,
            "endTime": end,
            "duration": harDurationMinutes + ' minutes',
            "totalWaitTime": totalWaitTime.toFixed(3) + ' ms',
            "totalGetWaitTime": totalGetWaitTime.toFixed(3) + ' ms',
            "totalPostWaitTime": totalPostWaitTime.toFixed(3) + ' ms',
        }
    }
    postCallsInfo.push(metaData);
    let topFourTimes = {"top4": requestTimes.sort((a, b) => b.time - a.time).slice(0, 5)};
    postCallsInfo.push(topFourTimes);

    fs.writeFile('postCallsInfo.json', JSON.stringify(postCallsInfo, null, 2), (err) => {
        if (err) {
            console.error('Error writing the file:', err);
            return;
        }
        console.log('File has been written successfully');
    });
}

function extractPOSTDataFactory(harEntry) {

    return {
        "url": harEntry.request.url,
        "method": harEntry.request.method,
        "postData": harEntry.request.postData ? harEntry.request.postData.text : 'Not a POST request',
        "serverIPAddress": harEntry.serverIPAddress,
        "startedDateTime": harEntry.startedDateTime,
        "time": harEntry.time,
        "timings": {
          "blocked": harEntry.timings.blocked,
          "dns": harEntry.timings.dns,
          "ssl": harEntry.timings.ssl,
          "connect": harEntry.timings.connect,
          "send": harEntry.timings.send,
          "wait": harEntry.timings.wait,
          "receive": harEntry.timings.receive,
          "_blocked_queueing": harEntry.timings._blocked_queueing
        }
    }
}
// Replace 'path_to_har_file.har' with the path to your HAR file
readHarFile('path_to_har_file.har');