Production-Grade TCP/IP Stack and Embedded Web Server for Microcontrollers

Mongoose is a production-grade embedded networking library that provides a complete TCP/IP stack with HTTP server, WebSocket, TLS/HTTPS, MQTT, and OTA firmware updates for STM32, NXP, RP2350, ESP32, and other Cortex-M and RISC-V microcontrollers. Delivered as a self-contained two-file C library (mongoose.c and mongoose.h) with no external dependencies, it runs on bare metal or RTOS and enables secure device dashboards, MQTT cloud connectivity, and reliable remote updates. The Mongoose Wizard lets teams build professional device dashboards visually, without frontend expertise.

Use Mongoose Wizard to evaluate »

Embedded Web Server and Full Networking Stack for Connected Devices

What our Customers say

Mongoose has helped us to achieve the required level of performance with the seamless integration.

Santhosh Kumar P.B.
Lead Architect, Schneider Electric (France)

Mongoose is well documented, well supported, stable and full of features. The support and response time for any queries was outstanding.

Tony Gaunce
Principal Engineer, Broadcom Inc. (USA)

We have exclusively used the Mongoose web server since 2012 and we have never regretted that decision.

Joe Porthouse
Director of Engineering, Toptech Systems Inc. (USA)

Mongoose was the only product which fulfilled our requirements. Our experience was good enough to influence other development teams in Pilz to use Mongoose.

Frank Eberle
Software Developer, Pilz GmbH (Germany)

Mongoose has become the standard across all our development areas. The Mongoose team’s professionalism, teamwork, and focus have enabled us to reach the next level.

Manuel Solano
Product Manager, Balluff GmbH (Germany)

Everything just works, we faced no problems with Mongoose.

Samuel Remy
Project Engineer, HAENNI Instruments Inc. (Switzerland)

See case studies for more

Mongoose vs vendor SDK examples

The typical alternative is taking vendor SDK networking examples (often lwIP + FreeRTOS or Zephyr) and turning them into a product. It works for a demo, then slows down: too many moving parts from different vendors, mediocre UI, painful TLS integration, and hard-to-reproduce field bugs.

Mongoose is a complete stack for microcontrollers. It replaces lwIP-based or custom networking implementations and provides built-in HTTP server, WebSocket, MQTT client, TLS security, and OTA update support with minimal integration effort.

Mongoose	Vendor SDK examples
✓ Integrated - has everything you need built in	✕ Fragmented - lots of extra pieces to stitch together and maintain
✓ Visual Web UI builder - professional dashboards, no frontend skills needed	✕ DIY UI - HTML/JS tooling, assets, and hand-built pages
✓ Flexible - works with lwIP, Zephyr, NetX, or standalone	✕ Locked to one setup, and nowhere near production-ready
✓ Firmware OTA updates - built-in	✕ No OTA - must implement your own
✓ Developer-led support from the engineers who built the stack	✕ Forums and samples, sometimes with no response
✓ Proactive security - get fixes before CVEs go public - stay CRA compliant	✕ Reactive security - riskier, tracking multiple components

Get running in minutes

Do it yourself - try Mongoose Wizard

Open Mongoose Wizard, select your MCU or platform, select the target project directory and and get a minimal, maintainable skeleton firmware code

Open Mongoose Wizard » Watch example video »

Build Faster with a Mongoose Engineer

Schedule a free, hands-on 45-minute session to troubleshoot or optimize development on your own hardware (e.g., solve issues or optimize WebUI). Please have your device and dev environment ready.

Book guided session »

Why Mongoose

All-in-one

Drivers, TCP/IP, TLS, HTTP, WebSocket, MQTT, JSON, and OTA in two files only.

Mongoose Wizard

Build pro device dashboards fast - no frontend skills needed.

Fits your firmware

Works with lwIP, Zephyr, NetX, or standalone. On any RTOS or bare metal.

Tiny footprint

Runs on 8-bit MCUs with 6 KB RAM. Built-in TLS: enables fast handshakes, using ~50 KB flash and only a few KB RAM per connection.

Security & EU CRA compliance

Get private security fixes before CVEs go public - patch early, stay safe.

Firmware OTA updates

Built-in OTA updates - no need to build your own system.

Support by authors

Support comes from the engineers who built it all. You're never on your own.

Licensing

Mongoose is dual-licensed: GPLv2 and commercial. Use GPLv2 for evaluation and prototyping. Choose a commercial license when shipping production devices.

GPLv2 Open Source

Great for evaluation, prototypes, and learning. Explore the repository and documentation to get started quickly.

Github » Documentation »

Commercial licensing

For shipping proprietary firmware at scale, with developer-led support and a security workflow aligned with production needs.

See licensing details » Request a quote »

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Embedded Web Server for IoT and Connected Devices

Mongoose is a complete embedded TCP/IP stack and lightweight HTTP/WebSocket server for microcontrollers, with built-in TLS/HTTPS, MQTT client for cloud connectivity, and OTA firmware update support. It runs without lwIP or any external networking dependencies and is designed for minimal footprint in resource-constrained systems, including 8-bit microcontrollers with as little as 6 KB of RAM. The built-in TLS implementation is pre-tuned for embedded performance, requiring about 50 KB of flash and only a few KB of RAM, making it suitable for secure device dashboards, REST APIs, MQTT cloud connectivity, and production-grade embedded products.