apitrace

Discover API endpoints at runtime and generate Mermaid sequence diagrams for documentation and debugging.

Repository: github.com/chandpriyankara/apitrace

Install

pnpm add @tix.lk/apitrace

Generate diagrams from discovery data

Use the core API with your own controller/service metadata:

import { generateMermaidDiagram } from '@tix.lk/apitrace';

const diagram = await generateMermaidDiagram(
  {
    controllers: [
      {
        name: 'UserController',
        path: '/users',
        module: 'UserModule',
        guards: [],
        dependencies: ['UserService'],
        endpoints: [
          {
            method: 'GET',
            path: '/users',
            methodName: 'findAll',
            controller: 'UserController',
            module: 'UserModule',
            guards: [],
            roles: [],
            parameters: [],
            returnType: 'Promise<User[]>',
            decorators: [],
            dependencies: [],
          },
        ],
      },
    ],
    services: [
      {
        name: 'UserService',
        module: 'UserModule',
        methods: ['findAll'],
        dependencies: [],
        repositories: ['UserRepository'],
      },
    ],
  },
  {
    apiName: 'My API',
    sourceRoot: './src',
  },
);

console.log(diagram); // paste into mermaid.live

Runtime discovery module

For decorator-based Node.js applications, register the built-in discovery module:

import { join } from 'path';
import { ApiTraceModule } from '@tix.lk/apitrace';

ApiTraceModule.forRoot({
  apiName: 'My API',
  sourceRoot: join(process.cwd(), 'src'),
});

This exposes GET /api-trace/sequence-diagram and returns plain Mermaid text.

Peer dependencies apply when using the runtime discovery module.

Exports

Export	Purpose
generateMermaidDiagram	Build a full diagram from discovery data
generateControllerMermaidDiagram	Diagram for a single route handler
ApiTraceModule	Runtime discovery + optional HTTP endpoint
ApiTraceService	Programmatic discovery and diagram generation
buildFullPath, findBestMatchingMethod	Routing and method-matching helpers

Development

pnpm install
pnpm test
pnpm build

License

Licensed under the Apache License, Version 2.0. See LICENSE.