How to get browser console error messages using Selenium WebDriver + C#

Follow these steps to collect browser logs and then output them.

1 – Create a function for collecting error logs
This function return a list of browser errors. like this:

    private List<string> GetBrowserError()
    {
        ILogs logs = this.Driver.Manage().Logs;
        var logEntries = logs.GetLog(LogType.Browser); // LogType: Browser, Server, Driver, Client and Profiler
        List<string> errorLogs = logEntries.Where(x => x.Level == LogLevel.Severe).Select(x => x.Message).ToList();
        return errorLogs;
     }

2 – Add the logs to TestContext
Like this:

    private void AddBorwserLogs()
    {
        string errors = "n n*** Errors ***n n";
        List<string> errorLogs = this.GetBrowserError();

        if (errorLogs.Count != 0)
        {
            foreach (var logEntry in errorLogs)
            {
                errors = errors + $"{logEntry}n";
            }
        }

        // Add errors to TestContext
        TestContext.WriteLine($"{errors}nNumber of browser errors is: {errorLogs.Count}");
     }

3 – Function calling
Call the AddBorwserLogs() function before test teardown. Like this:

    [TestCleanup]
    public void TeardownTest()
    {
        this.AddBorwserLogs();
        this.Driver.Close();
        this.Driver.Quit();
     }

Don’t forget to initialize the WebDriver
Like this:

    public IWebDriver Driver;
    public TestContext TestContext { get; set; }

    [TestInitialize]
    public void SetupTest()
    {
        ChromeOptions options = new ChromeOptions();
        options.AddArguments("ignore-certificate-errors");
    
        this.Driver = new ChromeDriver(options);

        this.Driver.Manage().Timeouts().PageLoad = new TimeSpan(0, 0, 70);
        var url = "https://www.selenium.dev/documentation/";
        this.Driver.Url = url;
    }