Hi

\"\n});\n```\n\n## Val Town Utility Functions\n\nVal Town provides several utility functions to help with common project tasks.\n\n### Importing Utilities\n\nAlways import utilities with version pins to avoid breaking changes:\n\n```ts\nimport { parseProject, readFile, serveFile } from \"https://esm.town/v/std/utils@85-main/index.ts\";\n```\n\n### Available Utilities\n\n\n#### **serveFile** - Serve project files with proper content types\n\nFor example, in Hono:\n\n```ts\n// serve all files in frontend/ and shared/\napp.get(\"/frontend/*\", c => serveFile(c.req.path, import.meta.url));\napp.get(\"/shared/*\", c => serveFile(c.req.path, import.meta.url));\n```\n\n#### **readFile** - Read files from within the project:\n\n```ts\n// Read a file from the project\nconst fileContent = await readFile(\"/frontend/index.html\", import.meta.url);\n```\n\n#### **listFiles** - List all files in the project\n\n```ts\nconst files = await listFiles(import.meta.url);\n```\n\n#### **parseProject** - Extract information about the current project from import.meta.url\n\nThis is useful for including info for linking back to a val, ie in \"view source\" urls:\n\n```ts\nconst projectVal = parseProject(import.meta.url);\nconsole.log(projectVal.username); // Owner of the project\nconsole.log(projectVal.name); // Project name\nconsole.log(projectVal.version); // Version number\nconsole.log(projectVal.branch); // Branch name\nconsole.log(projectVal.links.self.project); // URL to the project page\n```\n\nHowever, it's *extremely importing* to note that `parseProject` and other Standard Library utilities ONLY RUN ON THE SERVER.\nIf you need access to this data on the client, run it in the server and pass it to the client by splicing it into the HTML page\nor by making an API request for it.\n\n## Val Town Platform Specifics\n\n- **Redirects:** Use `return new Response(null, { status: 302, headers: { Location: \"/place/to/redirect\" }})` instead of `Response.redirect` which is broken\n- **Images:** Avoid external images or base64 images. Use emojis, unicode symbols, or icon fonts/libraries instead\n- **AI Image:** To inline generate an AI image use: `

`\n- **Storage:** DO NOT use the Deno KV module for storage\n- **Browser APIs:** DO NOT use the `alert()`, `prompt()`, or `confirm()` methods\n- **Weather Data:** Use open-meteo for weather data (doesn't require API keys) unless otherwise specified\n- **View Source:** Add a view source link by importing & using `import.meta.url.replace(\"ems.sh\", \"val.town)\"` (or passing this data to the client) and include `target=\"_top\"` attribute\n- **Error Debugging:** Add `` to HTML to capture client-side errors\n- **Error Handling:** Only use try...catch when there's a clear local resolution; Avoid catches that merely log or return 500s. Let errors bubble up with full context\n- **Environment Variables:** Use `Deno.env.get('keyname')` when you need to, but generally prefer APIs that don't require keys\n- **Imports:** Use `https://esm.sh` for npm and Deno dependencies to ensure compatibility on server and browser\n- **Storage Strategy:** Only use backend storage if explicitly required; prefer simple static client-side sites\n- **React Configuration:** When using React libraries, pin versions with `?deps=react@18.2.0,react-dom@18.2.0` and start the file with `/** @jsxImportSource https://esm.sh/react@18.2.0 */`\n- Ensure all React dependencies and sub-dependencies are pinned to the same version\n- **Styling:** Default to using TailwindCSS via `` unless otherwise specified\n\n## Project Structure and Design Patterns\n\n### Recommended Directory Structure\n```\n├── backend/\n│ ├── database/\n│ │ ├── migrations.ts # Schema definitions\n│ │ ├── queries.ts # DB query functions\n│ │ └── README.md\n│ └── routes/ # Route modules\n│ ├── [route].ts\n│ └── static.ts # Static file serving\n│ ├── index.ts # Main entry point\n│ └── README.md\n├── frontend/\n│ ├── components/\n│ │ ├── App.tsx\n│ │ └── [Component].tsx\n│ ├── favicon.svg\n│ ├── index.html # Main HTML template\n│ ├── index.tsx # Frontend JS entry point\n│ ├── README.md\n│ └── style.css\n├── README.md\n└── shared/\n ├── README.md\n └── utils.ts # Shared types and functions\n```\n\n### Backend (Hono) Best Practices\n\n- Hono is the recommended API framework\n- Main entry point should be `backend/index.ts`\n- **Static asset serving:** Use the utility functions to read and serve project files:\n ```ts\n import { readFile, serveFile } from \"https://esm.town/v/std/utils@85-main/index.ts\";\n \n // serve all files in frontend/ and shared/\n app.get(\"/frontend/*\", c => serveFile(c.req.path, import.meta.url));\n app.get(\"/shared/*\", c => serveFile(c.req.path, import.meta.url));\n \n // For index.html, often you'll want to bootstrap with initial data\n app.get(\"/\", async c => {\n let html = await readFile(\"/frontend/index.html\", import.meta.url);\n \n // Inject data to avoid extra round-trips\n const initialData = await fetchInitialData();\n const dataScript = ``;\n \n html = html.replace(\"\", `${dataScript}`);\n return c.html(html);\n });\n ```\n- Create RESTful API routes for CRUD operations\n- Always include this snippet at the top-level Hono app to re-throwing errors to see full stack traces:\n ```ts\n // Unwrap Hono errors to see original error details\n app.onError((err, c) => {\n throw err;\n });\n ```\n\n### Database Patterns\n- Run migrations on startup or comment out for performance\n- Change table names when modifying schemas rather than altering\n- Export clear query functions with proper TypeScript typing\n\n## Common Gotchas and Solutions\n\n1. **Environment Limitations:** \n - Val Town runs on Deno in a serverless context, not Node.js\n - Code in `shared/` must work in both frontend and backend environments\n - Cannot use `Deno` keyword in shared code\n - Use `https://esm.sh` for imports that work in both environments\n\n2. **SQLite Peculiarities:**\n - Limited support for ALTER TABLE operations\n - Create new tables with updated schemas and copy data when needed\n - Always run table creation before querying\n\n3. **React Configuration:**\n - All React dependencies must be pinned to 18.2.0\n - Always include `@jsxImportSource https://esm.sh/react@18.2.0` at the top of React files\n - Rendering issues often come from mismatched React versions\n\n4. **File Handling:**\n - Val Town only supports text files, not binary\n - Use the provided utilities to read files across branches and forks\n - For files in the project, use `readFile` helpers\n\n5. **API Design:**\n - `fetch` handler is the entry point for HTTP vals\n - Run the Hono app with `export default app.fetch // This is the entry point for HTTP vals`\n\n",[],[189],{"_103":197,"_95":198,"_152":199,"_154":-5,"_155":137,"_156":200,"_158":159,"_105":201,"_99":32,"_161":182,"_163":202,"_164":22,"_165":-5,"_166":203,"_98":204},"1d53d2f4-9464-11f0-9551-0224a6c84d84","test.ts","1d53d3c6-9464-11f0-9551-0224a6c84d84",3,["D",1758181815799],"/**\n * Test file for JsonDB\n * Run this to verify the library works correctly\n */\n\nimport { jsonDb } from \"./src/json-db.ts\";\n\nasync function runTests() {\n console.log(\"🧪 Starting JsonDB tests...\\n\");\n\n try {\n // Test 1: Collection Management\n console.log(\"1️⃣ Testing collection management...\");\n await jsonDb.createCollection(\"test_users\");\n const collections = await jsonDb.listCollections();\n console.log(\"✅ Collections:\", collections);\n console.log(\"✅ Collection 'test_users' created\\n\");\n\n // Test 2: Document Insertion\n console.log(\"2️⃣ Testing document insertion...\");\n const user1 = await jsonDb.insert(\"test_users\", {\n name: \"Alice Johnson\",\n email: \"alice@example.com\",\n age: 28,\n role: \"admin\",\n preferences: {\n theme: \"dark\",\n notifications: true\n }\n });\n console.log(\"✅ User 1 inserted:\", user1);\n\n const user2 = await jsonDb.insert(\"test_users\", {\n name: \"Bob Smith\",\n email: \"bob@example.com\",\n age: 32,\n role: \"user\",\n preferences: {\n theme: \"light\",\n notifications: false\n }\n });\n console.log(\"✅ User 2 inserted:\", user2);\n\n const user3 = await jsonDb.insert(\"test_users\", {\n name: \"Charlie Brown\",\n email: \"charlie@example.com\",\n age: 25,\n role: \"user\",\n preferences: {\n theme: \"dark\",\n notifications: true\n }\n });\n console.log(\"✅ User 3 inserted:\", user3);\n console.log(\"\");\n\n // Test 3: Document Retrieval\n console.log(\"3️⃣ Testing document retrieval...\");\n const allUsers = await jsonDb.find(\"test_users\");\n console.log(\"✅ All users:\", allUsers.length, \"found\");\n\n const foundUser = await jsonDb.findById(\"test_users\", user1.id);\n console.log(\"✅ Found user by ID:\", foundUser?.name);\n\n const adminUsers = await jsonDb.find(\"test_users\", {\n where: { role: \"admin\" }\n });\n console.log(\"✅ Admin users:\", adminUsers.length, \"found\");\n console.log(\"\");\n\n // Test 4: Document Updates\n console.log(\"4️⃣ Testing document updates...\");\n const updateResult = await jsonDb.updateById(\"test_users\", user2.id, {\n age: 33,\n preferences: { theme: \"dark\" }\n });\n console.log(\"✅ Update result:\", updateResult);\n\n const updatedUser = await jsonDb.findById(\"test_users\", user2.id);\n console.log(\"✅ Updated user age:\", updatedUser?.age);\n console.log(\"✅ Updated user theme:\", updatedUser?.preferences?.theme);\n console.log(\"\");\n\n // Test 5: Querying and Sorting\n console.log(\"5️⃣ Testing queries and sorting...\");\n const sortedUsers = await jsonDb.find(\"test_users\", {\n sort: [{ field: \"age\", direction: \"asc\" }]\n });\n console.log(\"✅ Users sorted by age:\", sortedUsers.map(u => `${u.name} (${u.age})`));\n\n const darkThemeUsers = await jsonDb.find(\"test_users\", {\n where: { \"preferences.theme\": \"dark\" }\n });\n console.log(\"✅ Dark theme users:\", darkThemeUsers.length, \"found\");\n console.log(\"\");\n\n // Test 6: Counting and Statistics\n console.log(\"6️⃣ Testing counting and statistics...\");\n const totalCount = await jsonDb.count(\"test_users\");\n console.log(\"✅ Total users:\", totalCount);\n\n const userCount = await jsonDb.count(\"test_users\", { role: \"user\" });\n console.log(\"✅ Regular users:\", userCount);\n\n const stats = await jsonDb.getCollectionStats(\"test_users\");\n console.log(\"✅ Collection stats:\", stats);\n console.log(\"\");\n\n // Test 7: Batch Operations\n console.log(\"7️⃣ Testing batch operations...\");\n const newUsers = [\n { name: \"Diana Prince\", email: \"diana@example.com\", age: 30, role: \"user\" },\n { name: \"Eve Wilson\", email: \"eve@example.com\", age: 27, role: \"admin\" }\n ];\n const batchResults = await jsonDb.insertMany(\"test_users\", newUsers);\n console.log(\"✅ Batch insert results:\", batchResults.filter(r => r.success).length, \"successful\");\n console.log(\"\");\n\n // Test 8: Pagination\n console.log(\"8️⃣ Testing pagination...\");\n const page1 = await jsonDb.find(\"test_users\", { limit: 2, offset: 0 });\n const page2 = await jsonDb.find(\"test_users\", { limit: 2, offset: 2 });\n console.log(\"✅ Page 1:\", page1.length, \"users\");\n console.log(\"✅ Page 2:\", page2.length, \"users\");\n console.log(\"\");\n\n // Test 9: Document Deletion\n console.log(\"9️⃣ Testing document deletion...\");\n const deleteResult = await jsonDb.deleteById(\"test_users\", user3.id);\n console.log(\"✅ Delete result:\", deleteResult);\n\n const remainingCount = await jsonDb.count(\"test_users\");\n console.log(\"✅ Remaining users after deletion:\", remainingCount);\n console.log(\"\");\n\n // Test 10: Database Statistics\n console.log(\"🔟 Testing database statistics...\");\n const dbStats = await jsonDb.getStats();\n console.log(\"✅ Database stats:\", dbStats);\n console.log(\"\");\n\n // Test 11: Error Handling\n console.log(\"1️⃣1️⃣ Testing error handling...\");\n const nonExistent = await jsonDb.findById(\"test_users\", \"non-existent-id\");\n console.log(\"✅ Non-existent document:\", nonExistent);\n\n const nonExistentCollection = await jsonDb.find(\"non_existent_collection\");\n console.log(\"✅ Non-existent collection query:\", nonExistentCollection.length, \"documents\");\n console.log(\"\");\n\n // Cleanup\n console.log(\"🧹 Cleaning up test data...\");\n await jsonDb.dropCollection(\"test_users\");\n console.log(\"✅ Test collection dropped\");\n\n console.log(\"\\n🎉 All tests completed successfully!\");\n console.log(\"JsonDB is working correctly! 🚀\");\n\n } catch (error) {\n console.error(\"❌ Test failed:\", error);\n throw error;\n }\n}\n\n// Run tests if this file is executed directly\nif (import.meta.main) {\n runTests().catch(console.error);\n}\n\nexport { runTests 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wilhelm

json-db