Svelteesp32 screenshot

Svelteesp32

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Updated: 11 Jan 2026
97 Stars

Convert Svelte (or React/Angular/Vue) JS application to serve it from ESP32/ESP8266 webserver

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Overview

SvelteESP32 is a groundbreaking npm package designed for developers who are creating microcontroller solutions using the ESP32 or ESP8266. This tool allows for the seamless integration of Svelte (or similar frameworks like React, Angular, or Vue) applications directly into the microcontroller’s firmware, ensuring that web interfaces can be served efficiently and updated with a single binary file. Designed for ease of use, SvelteESP32 simplifies the deployment process by including all necessary JS, HTML, CSS, and asset files directly in the Arduino or PlatformIO C++ code.

This solution is particularly advantageous for developers who frequently work with OTA (Over The Air) updates, as it eliminates the complexities associated with traditional file systems like SPIFFS and LittleFS. By converting web application files into a binary byte array, SvelteESP32 optimizes both performance and memory efficiency, making it a compelling choice for those building web content for microcontrollers.

Features

  • Single Binary OTA: Everything is embedded in the firmware, allowing for easy updates without needing separate partition uploads.
  • Gzip Compression: Automatic build-time compression reduces file sizes by over 15%, enhancing loading speeds.
  • ETag Support: Built-in MD5 ETags provide 304 responses, minimizing unnecessary data transfer.
  • CI/CD Integration: Simplifies build processes with an easy npm package, streamlining deployment in continuous integration and delivery pipelines.
  • Memory Efficiency: Utilizes flash memory efficiently with PROGMEM/const arrays, reducing overhead compared to traditional filesystems.
  • Performance: Direct byte array serving improves application responsiveness and reduces filesystem read overhead.
  • Setup Complexity: Requires only including a header and calling an initialization function, making the setup process straightforward.

With these features, SvelteESP32 stands out as an excellent choice for developers looking to streamline their microcontroller web applications while maximizing performance and ease of maintenance.