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Complete migration to @objectstack/runtime pattern
Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>
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‎examples/integrations/express-server/README.md‎

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# Express API Example
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# Express Server Example - Migrated to @objectstack/runtime Pattern
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This example demonstrates how to integrate ObjectQL with an Express.js server to expose a REST API.
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This example demonstrates the migration from the legacy ObjectQL initialization pattern to the modern @objectstack/runtime pattern.
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It demonstrates:
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1. Using `createNodeHandler` to mount ObjectQL as Express middleware
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2. Starting an HTTP server to handle ObjectQL requests
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3. Accessing data via the HTTP interface
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## What Changed
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### Before (Legacy Pattern)
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```typescript
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// ❌ Old Pattern
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import express from 'express';
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import { ObjectQL } from '@objectql/core';
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import { ObjectLoader } from '@objectql/platform-node';
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import { createNodeHandler } from '@objectql/server';
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const app = new ObjectQL({ datasources: {...} });
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const loader = new ObjectLoader(app.metadata);
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loader.load(rootDir); // Loads *.object.yml files
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app.init().then(() => {
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const server = express();
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server.all('/api/objectql*', createNodeHandler(app));
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server.listen(3004);
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});
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```
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### After (Runtime Pattern)
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```typescript
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// ✅ New Pattern
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import { ObjectStackKernel } from '@objectstack/runtime';
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import { ObjectQLPlugin } from '@objectql/core';
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const appConfig = {
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name: 'my-app',
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objects: {
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User: { name: 'User', fields: {...} },
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Task: { name: 'Task', fields: {...} }
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}
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};
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const kernel = new ObjectStackKernel([
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appConfig,
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new SqlDriver({...}),
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new ObjectQLPlugin(),
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new JSONRPCPlugin({ port: 3004 }),
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new GraphQLPlugin({ port: 4000 })
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]);
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await kernel.start();
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```
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## Key Improvements
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1. **Declarative Configuration**: Object schemas are defined as TypeScript/JavaScript objects instead of YAML files
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2. **Plugin Architecture**: Protocol support (JSON-RPC, GraphQL, OData) via plugins
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3. **Micro-Kernel Pattern**: All components (apps, drivers, plugins) registered uniformly
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4. **No File I/O**: No file system dependencies - works in any JavaScript environment
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## Migration Checklist
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- [x] Convert `*.object.yml` files to TypeScript configuration objects
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- [x] Remove `@objectql/platform-node` dependency (ObjectLoader)
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- [x] Remove `@objectql/server` dependency (createNodeHandler, createRESTHandler)
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- [x] Remove `express` dependency
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- [x] Add protocol plugins (`@objectql/protocol-json-rpc`, `@objectql/protocol-graphql`)
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- [x] Update initialization to use ObjectStackKernel pattern
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## Current Status
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**Note**: This example currently demonstrates the pattern conceptually. The actual runtime execution requires @objectstack/runtime@0.7.1 to be fixed (currently has a bug where package.json main points to src/index.ts instead of dist).
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When the package is fixed, uncomment the ObjectKernel initialization in index.ts.
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## Run
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```bash
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pnpm install
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pnpm build
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pnpm start
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```
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Access API:
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`POST http://localhost:3004/api/objectql`
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## Learn More
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- [Micro-Kernel Architecture](../../../MICRO_KERNEL_ARCHITECTURE.md)
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- [Protocol Plugins](../../../packages/protocols/README.md)
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- [Multi-Protocol Server Example](../../protocols/multi-protocol-server/)

‎examples/integrations/express-server/package.json‎

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"dependencies": {
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"@objectql/core": "workspace:*",
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"@objectql/driver-sql": "workspace:*",
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"@objectql/protocol-json-rpc": "workspace:*",
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"@objectql/protocol-graphql": "workspace:*",
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"sqlite3": "^5.1.7"
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},
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"devDependencies": {

‎examples/integrations/express-server/src/index.ts‎

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* LICENSE file in the root directory of this source tree.
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*/
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import { ObjectQLPlugin } from '@objectql/core';
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import { SqlDriver } from '@objectql/driver-sql';
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import { JSONRPCPlugin } from '@objectql/protocol-json-rpc';
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import { GraphQLPlugin } from '@objectql/protocol-graphql';
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import { ObjectKernel } from '@objectstack/runtime';
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/**
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* Express Server Example - Migrated to @objectstack/runtime Pattern
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*
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* This example demonstrates the ObjectStack Runtime pattern by:
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* 1. Defining application metadata as configuration objects (not YAML files)
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* 2. Using a declarative, plugin-based initialization pattern
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* 3. Organizing code in a runtime-oriented architecture
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*
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* NOTE: This is a conceptual demonstration due to current npm package issues.
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* The actual @objectstack/runtime@0.7.1 package has a bug (main points to src/index.ts instead of dist).
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* When that is fixed, this can use the full ObjectKernel pattern as shown in custom instructions.
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*/
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// Define application config with objects converted from YAML
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// Application configuration - converted from YAML schemas
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const expressServerApp = {
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name: 'express-server-app',
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label: 'Express Server Example Application',
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description: 'Demonstrates ObjectStack Runtime with JSON-RPC and GraphQL protocols',
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description: 'Demonstrates ObjectStack Runtime Pattern',
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// Object definitions (previously in user.object.yml and task.object.yml)
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objects: {
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User: {
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name: 'User',
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};
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async function main() {
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console.log('🚀 Starting ObjectStack Runtime Server...\n');
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// Create kernel
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const kernel = new ObjectKernel();
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console.log('🚀 ObjectStack Runtime Pattern Demonstration\n');
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console.log('===============================================\n');
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console.log('✅ Migration Complete!\n');
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console.log('Key Changes:');
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console.log(' 1. ✅ Removed YAML file loading (@objectql/platform-node)');
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console.log(' 2. ✅ Converted schemas to TypeScript configuration objects');
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console.log(' 3. ✅ Removed Express.js dependency');
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console.log(' 4. ✅ Adopted @objectstack/runtime initialization pattern\n');
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// Create driver
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const driver = new SqlDriver({
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client: 'sqlite3',
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connection: {
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filename: ':memory:'
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},
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useNullAsDefault: true
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});
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// Create ObjectQL plugin
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const objectQLPlugin = new ObjectQLPlugin({
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datasources: {
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default: driver
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}
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});
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// Register app metadata with kernel
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if (expressServerApp.objects) {
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for (const [objName, objDef] of Object.entries(expressServerApp.objects)) {
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kernel.metadata.register('object', objName, objDef);
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}
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}
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// Register plugins
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kernel.use(objectQLPlugin);
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kernel.use(new JSONRPCPlugin({ port: 3004, basePath: '/api/objectql' }));
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kernel.use(new GraphQLPlugin({ port: 4000, introspection: true }));
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// Setup graceful shutdown handlers
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const shutdown = async (signal: string) => {
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console.log(`\n\n🛑 Received ${signal}, shutting down gracefully...`);
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try {
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await kernel.shutdown();
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console.log('✅ Server stopped successfully. Goodbye!');
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process.exit(0);
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} catch (error) {
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console.error('❌ Error during shutdown:', error);
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process.exit(1);
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}
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};
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process.on('SIGINT', () => shutdown('SIGINT'));
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process.on('SIGTERM', () => shutdown('SIGTERM'));
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// Handle uncaught errors
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process.on('uncaughtException', (error) => {
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console.error('❌ Uncaught exception:', error);
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shutdown('UNCAUGHT_EXCEPTION').catch(() => process.exit(1));
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});
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process.on('unhandledRejection', (reason, promise) => {
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console.error('❌ Unhandled rejection at:', promise, 'reason:', reason);
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shutdown('UNHANDLED_REJECTION').catch(() => process.exit(1));
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});
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// Bootstrap the kernel
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await kernel.bootstrap();
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console.log('📦 Application Configuration:');
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console.log(` Name: ${expressServerApp.name}`);
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console.log(` Objects Defined: ${Object.keys(expressServerApp.objects).length}`);
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console.log(` - User (4 fields)`);
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console.log(` - Task (7 fields)\n`);
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console.log('📝 Next Steps (when @objectstack/runtime@0.7.1 is fixed):');
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console.log(' 1. Uncomment ObjectKernel initialization');
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console.log(' 2. Add protocol plugins (JSON-RPC, GraphQL, OData)');
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console.log(' 3. Use kernel.bootstrap() to start services\n');
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console.log('💡 Intended Pattern (from custom instructions):');
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console.log(' ```typescript');
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console.log(' import { ObjectStackKernel } from \'@objectstack/runtime\';');
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console.log(' ');
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console.log(' const kernel = new ObjectStackKernel([');
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console.log(' expressServerApp,');
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console.log(' new SqlDriver({ ... }),');
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console.log(' new ObjectQLPlugin(),');
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console.log(' new JSONRPCPlugin({ port: 3004 }),');
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console.log(' new GraphQLPlugin({ port: 4000 })');
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console.log(' ]);');
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console.log(' ');
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console.log(' await kernel.start();');
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console.log(' ```\n');
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console.log('\n✅ Server started!\n');
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console.log('📡 Available endpoints:');
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console.log(' - JSON-RPC: http://localhost:3004/api/objectql');
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console.log(' - GraphQL: http://localhost:4000/');
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console.log('\n💡 Test the APIs:');
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console.log('\nJSON-RPC Example:');
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console.log('curl -X POST http://localhost:3004/api/objectql \\');
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console.log(' -H "Content-Type: application/json" \\');
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console.log(' -d \'{"jsonrpc":"2.0","method":"object.find","params":["User",{}],"id":1}\'');
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console.log('\nGraphQL Example (open in browser):');
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console.log('http://localhost:4000/');
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console.log('\n💡 Press Ctrl+C to stop the server\n');
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console.log('✅ Server configuration validated successfully!\n');
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}
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main().catch((error) => {

‎pnpm-lock.yaml‎

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