Capturing Console Logs using Selenium Python

 Capturing browser console logs during Selenium test execution can be extremely helpful for debugging front-end issues such as JavaScript errors, failed API calls, or warnings that occur during runtime. Selenium WebDriver in Python allows you to access these logs, particularly when using ChromeDriver or EdgeDriver (as they are based on Chromium).

✅ Why Capture Console Logs?

Identify JavaScript errors affecting UI behavior

Debug network issues or blocked resources

Validate that no unexpected warnings are triggered during test execution

Ensure front-end best practices are followed

🛠️ Prerequisites

Python 3.x

Selenium installed (pip install selenium)

Chrome browser and ChromeDriver installed (ensure versions match)

⚙️ Setting Up Logging Preferences

To capture console logs, you need to enable logging via Chrome options and desired capabilities.

from selenium import webdriver

from selenium.webdriver.chrome.service import Service

from selenium.webdriver.common.desired_capabilities import DesiredCapabilities

# Enable browser logging

caps = DesiredCapabilities.CHROME.copy()

caps['goog:loggingPrefs'] = {'browser': 'ALL'}

options = webdriver.ChromeOptions()

service = Service("path/to/chromedriver")

driver = webdriver.Chrome(service=service, desired_capabilities=caps, options=options)

🔍 Accessing Console Logs

Once your test has run or at a desired checkpoint, use the following to fetch console logs:

# Navigate to page

driver.get("https://example.com")

# Capture browser console logs

logs = driver.get_log("browser")

for entry in logs:

    print(f"{entry['level']} - {entry['message']}")

Log levels include:

INFO

WARNING

SEVERE (typically JavaScript errors)

📌 Sample Output

SEVERE - https://example.com/script.js 404 (Not Found)

WARNING - [Deprecation] Something is deprecated

INFO - Console message from script.js

🚫 Limitations

Not supported in Firefox directly via Selenium

Logs may not include network-level details (use browser devtools protocol or tools like BrowserMob Proxy for that)

Works only with Chromium-based browsers

✅ Pro Tip: Filter Logs for Errors Only

errors = [log for log in logs if log['level'] == 'SEVERE']

if errors:

    print("JavaScript errors found:")

    for error in errors:

        print(error['message'])

📌 Final Thoughts

Capturing console logs with Selenium Python is a powerful debugging tool that helps bridge the gap between UI automation and front-end validation. It enables you to detect silent failures in scripts and browser behavior that traditional test assertions might miss. Add it to your automation suite for more robust and reliable testing.

Learn Selenium with Pyhton Training Hyderabad

Read More: Debugging Selenium Python Scripts

Read More:  Advanced XPath Techniques in Selenium Python

Read More: Organizing Large Selenium Python Projects


Visit IHUB Talent Institute Hyderabad
Get Direction

Comments

Post a Comment

Popular posts from this blog

How to Use Tosca's Test Configuration Parameters

Tosca by Tricentis is a powerful model-based test automation tool widely used in enterprise environments for end-to-end testing. One of its most useful features is Test Configuration Parameters (TCPs), which provide flexibility and control in managing test execution. TCPs enable testers to create reusable test cases by passing dynamic values without hardcoding them. This significantly enhances test maintenance, scalability, and efficiency. In this blog, we’ll explore what Test Configuration Parameters are, how to create and use them, and the best practices to follow when working with TCPs in Tosca. What Are Test Configuration Parameters? Test Configuration Parameters are custom-defined key-value pairs that can be associated with test cases, test case folders, or execution lists in Tosca. They help manage configuration data such as environment URLs, browser types, credentials, or any other variable data that may differ across test runs. By using TCPs, you can avoid duplicating test case...
Read more

Tosca Licensing: Types and Considerations

 Tosca by Tricentis is a widely used, enterprise-level automation testing tool known for its model-based approach, scriptless testing, and support for a wide range of applications (web, desktop, mobile, API, etc.). As organizations look to implement Tosca into their quality assurance processes, one of the key areas to understand is its licensing model. In this blog, we’ll explore the various types of Tosca licenses, key considerations for choosing the right license, and best practices to manage licensing efficiently within your test automation ecosystem. 🔑 Why Licensing Matters in Tosca Tosca is a commercial tool, and proper licensing is crucial to access its full range of capabilities, manage costs, scale efficiently, and remain compliant with Tricentis’s usage policies. The right licensing setup ensures that testers and teams can collaborate effectively without disruptions due to access or resource limitations. 📌 Types of Tosca Licenses Tricentis offers several licensing types ...
Read more

Using Hibernate ORM for Fullstack Java Data Management

In the world of fullstack Java development, managing data efficiently and seamlessly across the application is critical. One of the most powerful tools in the Java ecosystem for handling database operations is Hibernate ORM (Object-Relational Mapping). Hibernate simplifies the interaction between Java applications and relational databases, reducing boilerplate code and improving maintainability. This blog explores how Hibernate ORM works, why it’s widely used, and how it fits into the data management strategy of a fullstack Java application. What is Hibernate ORM? Hibernate ORM is an open-source Java framework that provides a powerful and flexible mechanism for mapping Java objects to database tables. It abstracts the low-level JDBC code, allowing developers to work with high-level object-oriented concepts. Instead of writing raw SQL queries, Hibernate allows developers to define database interactions using simple Java classes (also known as POJOs) and annotations or XML configurations...
Read more