Can ESP32 Run a Web Server?


Scott Campbell

Can ESP32 Run a Web Server?

The ESP32 is a powerful microcontroller that offers a range of connectivity options, making it suitable for various IoT (Internet of Things) applications. One of its notable features is the ability to run a web server, allowing you to control and monitor your devices remotely through a web interface.

Setting up the ESP32 Web Server

To get started, you’ll need an ESP32 development board and the Arduino IDE installed on your computer. Follow these steps to set up the ESP32 web server:

  1. Connect your ESP32 board to your computer using a USB cable.
  2. Open the Arduino IDE and go to File > Examples > WiFi.
  3. Select the WiFiWebServer example sketch.
  4. In the sketch, replace the SSID and password placeholders with your Wi-Fi network credentials.
  5. Upload the sketch to your ESP32 board by clicking on the upload button.

Accessing the Web Server

Once you have uploaded the sketch successfully, open the serial monitor from the Arduino IDE. The serial monitor will display the IP address assigned to your ESP32 by your Wi-Fi router.

Note: Make sure that your computer and ESP32 are connected to the same Wi-Fi network.

To access the web server, open any web browser on your computer and enter the IP address displayed in the serial monitor. You should see a simple web page with buttons or other controls that you can interact with.

Serving Dynamic Content

The basic example mentioned earlier serves static content. However, you can easily modify the code to serve dynamic content such as sensor readings or control inputs. You can use HTML, CSS, and JavaScript to create a more sophisticated web interface.

To serve dynamic content, you’ll need to modify the handleRoot() function in the example sketch. This function is responsible for generating the HTML code that will be sent to the client’s browser.

Security Considerations

Running a web server on an ESP32 introduces security considerations, especially if you plan to expose it to the internet. Here are a few tips to enhance security:

  • Change Default Credentials: By default, the example sketch uses “admin” as both the username and password. Change these credentials to something more secure.
  • Use HTTPS: If you plan to transmit sensitive data over the web server, consider using HTTPS (HTTP Secure) encryption.
  • Implement Access Control: Limit access to your web server by implementing access control mechanisms such as authentication and IP whitelisting.


The ESP32 is capable of running a web server, allowing you to control your IoT devices through a user-friendly web interface. By following a few simple steps, you can set up your own ESP32-based web server and customize it according to your specific requirements. However, always keep security in mind when exposing your devices on the internet.

Note: Ensure that you regularly update both your ESP32 firmware and any libraries used in your web server project to fix potential security vulnerabilities.

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