$ show projectdiscovery/nuclei
Nuclei is a template-based vulnerability scanner written in Go. It allows users to define security checks using YAML or JSON templates, which can be executed against a wide range of targets via multiple protocols (HTTP, DNS, network, file, etc.). The scanner features a modular architecture with a core engine that orchestrates template execution, a template system for parsing and compiling checks, and protocol-specific implementations for sending requests and processing responses. Key features include workflow chaining for multi-step attacks, fuzzing capabilities for dynamic application security testing, JavaScript extensibility for custom logic in templates, and integrations with various issue trackers and cloud platforms for result reporting. The project emphasizes performance through optimizations like template clustering (deduplicating identical requests across templates) and connection pooling. The codebase demonstrates strong engineering practices in several areas: a self-contained template clustering system for request deduplication, a JavaScript binding generation system that automates the creation of Goja-compatible libraries, a workflow context propagation system for sharing data between template steps, and a cryptographic template signing mechanism to ensure integrity. These components are designed to be reusable and showcase non-obvious solutions to common problems in security tooling. Maintenance is active with recent commits and a vibrant community. The project keeps pace with its ecosystem, showing low technical drift through regular updates to dependencies and active maintenance of generated code. Its extensive test suite and CI/CD pipelines further indicate a healthy, well-maintained project.
The LLM identified 3 files worth highlighting for reuse:
Groups identical requests across different templates to avoid redundant network traffic. This self-contained optimization reduces scan time and bandwidth usage in large-scale vulnerability scanning. Demonstrates non-obvious skill in applying deduplication at the template level.
Automatically generates JavaScript libraries from Go source code by scanning for special comments. This isolated tool enables Go projects to expose their APIs to JavaScript runtimes like Goja with minimal manual effort. Demonstrates skill in metaprogramming and cross-language interoperability.
Manages the execution of workflow templates by sharing extracted variables, cookiejars, and state between steps. This component enables complex multi-step attack chains where data from one template (e.g., extracted credentials) can be used in subsequent templates. Demonstrates a robust pattern for stateful workflow execution.