koajs/router
Router
This project provides a routing library for the Koa web framework, designed to map incoming HTTP requests to specific handler functions. It serves as a core infrastructure for organizing application logic into modular endpoints, utilizing declarative route registration and middleware-based request pipelines to process traffic.
The library distinguishes itself through its support for hierarchical router nesting, which allows for the creation of scalable, modular application architectures and distinct API versioning. It offers granular control over request matching, including support for regular expressions, hostname constraints, and configurable path matching behaviors. Furthermore, it automates HTTP method negotiation and provides dynamic URL generation based on named route definitions to ensure link consistency.
Beyond basic request dispatching, the framework integrates data validation and type inference to maintain data integrity throughout the request lifecycle. It also facilitates the orchestration of middleware chains, enabling developers to scope authentication, authorization, and data processing logic to specific URL paths or sub-paths.
The library includes built-in lifecycle management to handle unmatched routes and unsupported HTTP methods with standard-compliant responses. It is implemented in TypeScript and provides a centralized configuration interface for managing complex routing structures.
Features
- HTTP Request Routing - Maps incoming HTTP requests to specific handler functions based on URL patterns, methods, and constraints.
- Koa Routing Middleware - Maps incoming HTTP requests to specific handler functions within the web framework.
- Middleware-Based Request Pipelines - Executes sequential middleware functions to process incoming web requests and generate responses.
- HTTP Request Dispatching - Matches incoming web requests to defined routes based on URL paths, methods, and constraints.
- Recursive Router Mountings - Supports mounting sub-routers under path prefixes to create modular and scalable route hierarchies.
- Nested Routing - Provides hierarchical route structures by nesting sub-routers under specific path prefixes to enable modular application architecture.
- Node.js Routing Engines - Organizes application logic into modular endpoints with support for nested routers and parameter extraction.
- Route Registration - Maps HTTP methods and URL patterns to handler functions through a centralized declarative interface.
- Request Validation - Validates incoming request payloads and parameters against defined schemas to ensure data integrity.
- Path Matching Configurations - Offers granular control over path matching behavior, including case sensitivity, trailing slashes, and regular expression paths.
- Regex Path Matchers - Enables precise route identification by matching request URLs against regular expression patterns.
- Routing-Based Access Controls - Integrates authentication and authorization checks into the routing flow to verify user identity before granting access to endpoints.
- Metadata-Aware Request Handling - Injects route parameters and metadata into the request object for handler access.
- Path-Based Middleware Filtering - Restricts middleware execution to specific URL paths and sub-paths for improved performance.
- Middleware Chains - Executes multiple middleware functions sequentially for a single route to perform pre-handler tasks.
- Middleware Orchestration - Orchestrates sequences of middleware functions for specific routes to handle request processing.
- Modular Application Architectures - Facilitates modular application structure by nesting routers and grouping routes for scalability.
- URL Generators - Constructs valid request paths programmatically from named route definitions to ensure link consistency.
