Parse a Chrome HAR export into a CSV of all the network resource transactions

parse_chrome_har_to_resources_csv.js

// Parse the output of a Chrome .HAR and output a simple CSV with the URL and size in bytes (one per row) of every file loaded
// Usage: node parse.js <input.har> <output.csv>
// Example: node parse.js input.har output.csv

var fs = require('fs');

if (process.argv.length < 4) {
    console.log('Usage: node parse.js <input.har> <output.csv>');
    process.exit(1);
}

var input = process.argv[2];
var output = process.argv[3];

var data = fs.readFileSync(input, 'utf8');
var parsed = JSON.parse(data);

var entries = parsed.log.entries;
var csv = 'RequestMethod,RequestURL,RequestBytes,ResponseStatus,ResponseBytes\n';

for (var i = 0; i < entries.length; i++) {
    var entry = entries[i];
    var iMethod = entry.request.method;
    var iUrl = entry.request.url;
    var iBytes = entry.request.bodySize;
    var oStatus = entry.response.status;
    var oBytes = entry.response.content.size;
    csv += _safe(iMethod) + ',' + _safe(iUrl) + ',' + _safe(iBytes) + ',' + _safe(oStatus) + ',' + _safe(oBytes) + '\n';
}

fs.writeFileSync(output, csv);
console.log('Done!');


// Helper function to escape CSV values
function _safe(str) {
    if (str === undefined) {
        return '';
    }
    if (typeof str === 'number') {
        return str;
    }
    if (typeof str !== 'string') {
        return '"<object>"';
    }
    return '"' + str.replace(/"/g, '""') + '"';
}