Analyzing WebAssembly with the WebAssembly Binary Toolkit

WebAssembly powers high-performance web applications, but compiling code into binary format can make debugging and analysis incredibly difficult. To inspect, modify, and troubleshoot these applications, you need to know how to translate binary WASM files back into human-readable formats. This text-only course guides you through the essential tools within the WebAssembly Binary Toolkit (WABT). You will learn how to deconstruct compiled binaries, inspect their inner workings, and translate them into WebAssembly Text format (WAT), C, and JSON for deep analysis. What you'll learn: Understand the core architecture of WebAssembly binaries and the role of the toolkit; Convert WASM files to WebAssembly Text format (WAT) for manual reading and modification; Translate compiled binaries back into C code to trace execution logic; Generate JSON representations of WASM files to programmatically analyze module structures; Validate and debug WebAssembly files to ensure security compliance and runtime safety; Apply command-line tools like wasm2wat, wat2wasm, and wasm-objdump to real-world debugging workflows. We begin with the absolute basics of WebAssembly modules and toolkit installation. From there, you will read through step-by-step written explanations and code walkthroughs that demonstrate how to disassemble, assemble, and inspect binary files using command-line utilities. This course is designed for web developers, security analysts, and software engineers who are new to WebAssembly internals. No prior assembly or compiler experience is required. Start exploring the inner workings of WebAssembly today through our comprehensive written guide.