Comments on: ESP32 Web Server using LittleFS Filesystem (serve files from filesystem)

By: Sara Santos

Sara Santos — Sat, 28 Mar 2026 19:36:31 +0000

In reply to Thierry.

Hi.
You also need to add the lines to serve the image to the client.

For example:
server.on(“/sun”, HTTP_GET, [](AsyncWebServerRequest *request){
request->send(LittleFS, “/sun.png”, “image/jpg”);
});

This tutorial explains how to do it: https://randomnerdtutorials.com/display-images-esp32-esp8266-web-server/
Check this section of the tutorial: “Option #2: Store the Image on the ESP32/ESP8266 LittleFS”

Regards,
Sara

By: Thierry

Thierry — Thu, 26 Mar 2026 16:08:02 +0000

Dear Sara and Rui, thank you very much for all your very very good tutorials, the best on the net.
Based on your sketch, I wanted to add a jpg image. I placed a jpg picture (330 kB) in the data folder. I changed the index.html , just by adding

in the body.
I use the ESP32-2432S028R and the partition 4MB with SPIFFS. The web page is shown but not the image !!! What did I do wrong ?
Thank you for your help ! Thierry

By: Sara Santos

Sara Santos — Sun, 25 Jan 2026 14:51:45 +0000

In reply to amsovar.

Hi.
Yes.
ElegantOTA allows you to do that: https://randomnerdtutorials.com/esp32-ota-elegantota-arduino/
Regards,
Sara

By: amsovar

amsovar — Sat, 24 Jan 2026 13:02:20 +0000

Hi, Sara, great tutorial.

If you need to change the webpages after ESP32 deployment, is there a way to transfer them remotely via wireless (using ElegantOTA, as you do with the sketch)?

Thanks

By: Sara Santos

Sara Santos — Sat, 08 Nov 2025 17:42:36 +0000

In reply to Andjé Le.

Hi.
You’re probably using the wrong libraries.
Use the ESPAsyncWebServer library by ESP32Async
And AsyncTCP library by ESP32 Async
Available to install via the Arduino Library Manager.

Delete any previous versions of the library.

Check section 3. Installing Libraries
To install the correct libraries for this project.

Regards,
Sara

By: Andjé Le

Andjé Le — Sat, 08 Nov 2025 17:32:16 +0000

Bonjour Hello, I’m using Arduino 2.3.6 and I’m trying to compile your program. Do you have an explanation? https://randomnerdtutorials.com/esp32-web-server-littlefs/
I’m getting this error. Do you have a solution?
Thank you.
c:\Users\allx\Documents\Arduino\libraries\ESPAsyncWebServer\src\WebAuthentication.cpp: In function ‘bool getMD5(uint8_t*, uint16_t, char*)’:
c:\Users\allx\Documents\Arduino\libraries\ESPAsyncWebServer\src\WebAuthentication.cpp:74:3: error: ‘mbedtls_md5_starts_ret’ was not declared in this scope; did you mean ‘mbedtls_md5_starts’?

74 | mbedtls_md5_starts_ret(&_ctx);
| ^~~~~~~~~~~~~~~~~~~~~~
| mbedtls_md5_starts
c:\Users\allx\Documents\Arduino\libraries\ESPAsyncWebServer\src\WebAuthentication.cpp:75:3: error: ‘mbedtls_md5_update_ret’ was not declared in this scope; did you mean ‘mbedtls_md5_update’?
75 | mbedtls_md5_update_ret(&_ctx, data, len);
| ^~~~~~~~~~~~~~~~~~~~~~
| mbedtls_md5_update
c:\Users\allx\Documents\Arduino\libraries\ESPAsyncWebServer\src\WebAuthentication.cpp:76:3: error: ‘mbedtls_md5_finish_ret’ was not declared in this scope; did you mean ‘mbedtls_md5_finish’?
76 | mbedtls_md5_finish_ret(&_ctx, _buf);
| ^~~~~~~~~~~~~~~~~~~~~~
| mbedtls_md5_finish
exit status 1

By: Sara Santos

Sara Santos — Sat, 20 Sep 2025 18:33:21 +0000

In reply to Ahmed.

Double check that you’re using the exact library versions by ESP32Async that we recommend.
Make sure that you don’t have other versions of the same libraries installed.

Regards,
Sara

By: Ahmed

Ahmed — Fri, 19 Sep 2025 12:42:41 +0000

Hello, love the tutorial, i however keep getting errors when compiling that come from the source code of the ESPAsyncWebServer library, any idea on why ?

By: John

John — Fri, 01 Aug 2025 09:05:20 +0000

Thanks for the guide Sara.

I have used the below line for a few years and it allows you to access the webserver pages from IP address that dont match the one the web browser is on, such as when using the MDNS address or the Station IP address.

wiFiServer.on(“/”, HTTP_GET, [](AsyncWebServerRequest request)
{AsyncWebServerResponse *response = request->beginResponse(LittleFS, “/index.htm”, String(), false);response->addHeader(“Access-Control-Allow-Origin”, ““);request->send(response); });

By: Sara Santos

Sara Santos — Thu, 31 Jul 2025 13:48:00 +0000

In reply to Gary.

Great!
Thank you for your feedback.
Regards,
Sara