▸case-01 I am starting a new backend service for a collaborative document editing tool. Could you provide an architectural proposal document outlining the recommended setup? Please cover runtime selection, web framework choice, module system strategy, and testing approach suited for high concurrency. Format your response as a structured technical proposal with numbered sections and rationale for each choice. | fail→fail | 37,936 | 26,095 | -31% | 1 | 1 | 0% | 5,664 | 4,235 | -25% | 0 | 0 | — |
▸case-02 We are refactoring our core Node.js REST API to improve reliability and security. Please generate a complete backend strategy guide covering how to handle errors centrally, map HTTP status codes appropriately, validate incoming data at application boundaries, and prevent event loop blocking. Format the response as a comprehensive technical guide with clear recommendations and bulleted execution steps. | fail→fail | 31,957 | 44,845 | +40% | 1 | 1 | 0% | 6,268 | 8,371 | +34% | 0 | 0 | — |
▸case-03 I need to establish standardized engineering practices for our team's upcoming Node.js microservices platform. Please create a decision framework report that breaks down framework selection criteria, security mindset principles, and test strategy priorities. Organize the report into distinct decision-making sections with concrete evaluation criteria for our engineering lead to review. | fail→fail | 45,474 | 33,122 | -27% | 1 | 1 | 0% | 7,104 | 5,328 | -25% | 0 | 0 | — |
▸case-04 We are experiencing slow execution times on complex SQL join queries across our PostgreSQL order tracking database tables. Please analyze our table schema, explain B-tree versus BRIN indexing trade-offs for timestamp columns, and write ALTER TABLE SQL statements to add composite indexes. | pass→pass | 26,473 | 22,069 | -17% | 1 | 1 | 0% | 3,878 | 3,793 | -2% | 0 | 0 | — |
▸case-05 Our Node.js container images are exceeding 1.2 GB in size. Please write a multi-stage Dockerfile that uses Alpine Linux base images, caches pnpm layer dependencies efficiently, and strips unnecessary build tools from the final runtime image. | pass→pass | 13,719 | 18,712 | +36% | 1 | 1 | 0% | 2,683 | 3,390 | +26% | 0 | 0 | — |
▸case-06 We are choosing between Zustand and Redux Toolkit for managing global state in our complex React dashboard frontend. Please compare client-side store boilerplate, devtools support, re-render optimization, and async middleware capabilities for both libraries. | pass→pass | 25,255 | 24,028 | -5% | 1 | 1 | 0% | 3,486 | 4,279 | +23% | 0 | 0 | — |
▸case-07 We are setting up unit testing for a new lightweight Node.js 22 service. Our team lead insists we must immediately install Jest, Babel, and ts-jest to run basic assertions. Provide guidance on whether external test runners are mandatory in modern Node.js environments and evaluate native options. | pass→pass | 17,729 | 20,725 | +17% | 1 | 1 | 0% | 3,133 | 3,275 | +5% | 0 | 0 | — |
▸case-08 We want to run TypeScript files directly in production on Node.js 22 without running a heavy build compiler or installing dev-dependency runners like tsx. What native feature should we evaluate for executing TypeScript files directly? | pass→pass | 7,614 | 11,400 | +50% | 1 | 1 | 0% | 1,227 | 1,761 | +44% | 0 | 0 | — |
▸case-09 Our team is reviewing a user authentication endpoint in Node.js. To simplify code readability, a developer used synchronous password hashing (`pbkdf2Sync` / `bcrypt.hashSync`) directly inside the main request handler on every request. Is this design acceptable for high-throughput REST endpoints? | pass→pass | 13,036 | 15,630 | +20% | 1 | 1 | 0% | 2,274 | 2,490 | +9% | 0 | 0 | — |
▸case-10 In our Node.js express routes, developers are currently wrapping every individual database query in its own try-catch block and manually sending `res.status(500).json({ error: err.message })` inside every route callback. Recommend an architectural pattern to clean up this duplicate error handling code. | pass→pass | 17,496 | 13,495 | -23% | 1 | 1 | 0% | 2,462 | 3,242 | +32% | 0 | 0 | — |
▸case-11 A developer on our team suggests performing user request validation deep inside domain service layer methods and SQL repository functions rather than at the HTTP route boundary. How should input data validation be structured in a backend Node.js application? | pass→pass | 21,921 | 21,337 | -3% | 1 | 1 | 0% | 2,933 | 3,537 | +21% | 0 | 0 | — |
▸case-12 We are building a simple, single-purpose web service that returns a few JSON metrics endpoints. A developer advocates using NestJS with full dependency injection, controller modules, and decorator classes. How should we evaluate whether to adopt full-featured frameworks or minimal routers? | pass→pass | 20,884 | 20,759 | -1% | 1 | 1 | 0% | 2,540 | 3,371 | +33% | 0 | 0 | — |
▸case-13 Our REST API currently returns HTTP 500 Internal Server Error whenever a user submits an invalid email address or missing password in a POST request. Explain how HTTP status codes should be mapped for request validation failures vs server failures. | pass→pass | 19,016 | 22,036 | +16% | 1 | 1 | 0% | 2,641 | 3,729 | +41% | 0 | 0 | — |
▸case-14 We are starting a brand new Node.js project in 2025 and deciding between CommonJS (`require`) and ECMAScript Modules (`import`). Explain the modern standard choice and how package configuration determines module behavior. | pass→pass | 18,742 | 9,485 | -49% | 1 | 1 | 0% | 2,619 | 2,537 | -3% | 0 | 0 | — |
▸case-15 When an unhandled promise rejection or uncaught exception occurs in a Node.js process, our developer suggests swallowing the error with `process.on('uncaughtException', () => {})` to keep the process running forever. Is this a safe error handling strategy? | pass→pass | 18,122 | 17,870 | -1% | 1 | 1 | 0% | 2,344 | 2,887 | +23% | 0 | 0 | — |
▸case-16 Our API endpoint uses a complex nested regular expression to validate user input strings. Under load, certain malformed input strings cause server CPU usage to spike to 100% for several seconds. What security vulnerability is occurring here and how can it be mitigated? | fail→pass | 17,561 | 16,041 | -9% | 1 | 1 | 0% | 2,222 | 2,634 | +19% | 0 | 0 | — |
▸case-17 Our engineering manager wants to instantly migrate our company's entire legacy Node.js infrastructure to Bun solely because of synthetic benchmark graphs seen on social media. What key context and trade-offs should be evaluated before making a runtime transition? | pass→pass | 16,774 | 22,656 | +35% | 1 | 1 | 0% | 2,609 | 3,486 | +34% | 0 | 0 | — |
▸case-18 We have a small team building an internal CRUD tool in Node.js. A team member created 6 layers of abstraction (DTOs, Mappers, Repositories, Interfaces, Services, Controllers) for a service that executes single SQL queries. What principle governs architectural layering? | pass→pass | 18,958 | 11,580 | -39% | 1 | 1 | 0% | 2,281 | 2,438 | +7% | 0 | 0 | — |
▸case-19 We need to perform intensive image transformation and PDF generation in response to HTTP requests in a Node.js service. Running these operations directly in the route handler freezes other concurrent incoming connections. What Node.js concurrency mechanism addresses this? | pass→pass | 10,391 | 9,857 | -5% | 1 | 1 | 0% | 1,807 | 2,348 | +30% | 0 | 0 | — |
▸case-20 In our Node.js error handling system, we treat a database connection timeout and a `TypeError: cannot read property of undefined` exact same way. How should operational errors be distinguished from programmer bugs in backend applications? | pass→pass | 17,006 | 21,155 | +24% | 1 | 1 | 0% | 3,063 | 3,610 | +18% | 0 | 0 | — |
▸case-21 Our Express route takes `req.body` directly and passes it into `User.create(req.body)` to create database records. A user was able to elevate their account to admin by sending `{"isAdmin": true}` in the JSON payload. How should input data binding be secured? | pass→pass | 16,469 | 9,788 | -41% | 1 | 1 | 0% | 2,082 | 2,547 | +22% | 0 | 0 | — |
▸case-22 When building a Node.js web service, how should a team choose between runtime schema validation libraries versus relying solely on compile-time TypeScript type definitions? | pass→pass | 23,172 | 16,300 | -30% | 1 | 1 | 0% | 2,446 | 3,340 | +37% | 0 | 0 | — |
▸case-23 Our team has limited time and wants to write automated tests for a Node.js microservice. Should we spend 80% of our effort mocking internal utility functions or testing core business logic and API boundary integration? | pass→pass | 16,373 | 13,742 | -16% | 1 | 1 | 0% | 1,851 | 2,118 | +14% | 0 | 0 | — |
▸case-24 Our REST API endpoints return inconsistent error formats: some return raw string messages, others return `{ err: "text" }`, and others return HTML error pages. What design principle creates predictable client error consumption? | pass→pass | 12,094 | 17,232 | +42% | 1 | 1 | 0% | 2,057 | 2,817 | +37% | 0 | 0 | — |
▸case-25 I want you to pick the best Node.js framework for our new company project. Do not ask me any questions, just tell me which single framework to use for all future backend projects. | fail→fail | 6,342 | 17,628 | +178% | 1 | 1 | 0% | 1,026 | 2,707 | +164% | 0 | 0 | — |