diff --git a/.bass/issue.md b/.bass/issue.md new file mode 100644 index 0000000..00d7de2 --- /dev/null +++ b/.bass/issue.md @@ -0,0 +1,15 @@ +# Implement centralized error handling middleware + +Build a centralized error handler that catches all errors and returns consistent JSON responses with appropriate HTTP status codes (e.g., 400 for validation errors, 404 for missing resources, 500 for unexpected errors). + +Acceptance Criteria: +- All errors are returned as JSON objects with `message` and optionally `code` +- Unhandled routes return 404 Not Found with JSON body +- Validation errors return 400 Bad Request with JSON body + +Test Cases: +- Unit: Throwing a custom 404 error returns { "message": "..." } with status 404 +- Unit: Throwing a validation error returns { "message": "..." } with status 400 +- Edge: An unhandled exception returns 500 with a generic error message + +Please implement this fix. \ No newline at end of file diff --git a/package-lock.json b/package-lock.json new 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--git a/server.js b/server.js new file mode 100644 index 0000000..e7be4f4 --- /dev/null +++ b/server.js @@ -0,0 +1,132 @@ +const express = require('express'); +const { v4: uuidv4 } = require('uuid'); + +const app = express(); +app.use(express.json()); + +// In-memory storage +const todos = new Map(); + +class AppError extends Error { + constructor(message, statusCode, code) { + super(message); + this.statusCode = statusCode; + this.code = code; + } +} + +// POST /todos - Create a Todo +app.post('/todos', (req, res) => { + const { title } = req.body; + if (!title || typeof title !== 'string' || title.trim() === '') { + throw new AppError('title is required and must be a non-empty string', 400); + } + + const todo = { + id: uuidv4(), + title: title.trim(), + completed: false, + createdAt: new Date().toISOString(), + updatedAt: new Date().toISOString(), + }; + + todos.set(todo.id, todo); + return res.status(201).json(todo); +}); + +// GET /todos - List Todos +app.get('/todos', (req, res) => { + const { completed } = req.query; + let result = Array.from(todos.values()); + + if (completed === 'true') { + result = result.filter(t => t.completed); + } else if (completed === 'false') { + result = result.filter(t => !t.completed); + } + + return res.json(result); +}); + +// GET /todos/:id - Get a Todo +app.get('/todos/:id', (req, res) => { + const todo = todos.get(req.params.id); + if (!todo) { + throw new AppError('Todo not found', 404); + } + return res.json(todo); +}); + +// PATCH /todos/:id - Update a Todo +app.patch('/todos/:id', (req, res) => { + const todo = todos.get(req.params.id); + if (!todo) { + throw new AppError('Todo not found', 404); + } + + const { title, completed } = req.body; + const hasTitle = title !== undefined; + const hasCompleted = completed !== undefined; + + if (!hasTitle && !hasCompleted) { + throw new AppError('At least one of title or completed must be provided', 400); + } + + if (hasTitle) { + if (typeof title !== 'string' || title.trim() === '') { + throw new AppError('title must be a non-empty string', 400); + } + todo.title = title.trim(); + } + + if (hasCompleted) { + if (typeof completed !== 'boolean') { + throw new AppError('completed must be a boolean', 400); + } + todo.completed = completed; + } + + todo.updatedAt = new Date().toISOString(); + todos.set(todo.id, todo); + return res.json(todo); +}); + +// DELETE /todos/:id - Delete a Todo +app.delete('/todos/:id', (req, res) => { + if (!todos.has(req.params.id)) { + throw new AppError('Todo not found', 404); + } + + todos.delete(req.params.id); + return res.status(204).send(); +}); + +// Handle undefined routes +app.use((req, res) => { + res.status(404).json({ message: 'Not Found' }); +}); + +// Centralized error handler +// eslint-disable-next-line no-unused-vars +app.use((err, req, res, next) => { + const statusCode = err.statusCode || 500; + const response = { message: err.message }; + + if (err.code) { + response.code = err.code; + } + + if (statusCode === 500 && !err.statusCode) { + response.message = 'Internal Server Error'; + } + + res.status(statusCode).json(response); +}); + +const PORT = process.env.PORT || 3000; +app.listen(PORT, () => { + console.log(`Todo server running on port ${PORT}`); +}); + +module.exports = app; +module.exports.AppError = AppError;