Code generation, debugging and documentation
127 prompts
Act as a JavaScript expert. What should happen: [expected behaviour] What actually happens: [bug] Code: ```js [paste] ``` Explain the async flow step by step, identify the bug (race condition, missing await, unhandled rejection, etc.), provide fixed code, and suggest patterns to prevent it (Promise.all, AbortControlle…
Fix race conditions, unhandled promises and ordering bugs in async JavaScript.
You are a performance engineer. Platform: [browser app, Node.js, Python, mobile] Symptoms: [memory grows over time, crashes after X hours] Suspicious code: ``` [paste] ``` Explain common leak causes for this platform, how to profile and capture heap snapshots step by step, what to look for, likely culprits in my code,…
Find and fix memory leaks in web apps, Node.js services or mobile apps.
Turn this code into documentation. Code: ``` [paste] ``` Provide: a plain-English step-by-step description, a Mermaid flowchart (or sequence diagram if it involves multiple services), the inputs and outputs, and any edge cases visible in the logic.
Visualise how a function or process works with a Mermaid flowchart and plain-English steps.
Analyse the time and space complexity of this code. ``` [paste] ``` Explain the Big-O line by line in simple terms, identify the bottleneck, describe what happens with 10× and 1000× more data, and suggest a more efficient approach if one exists, with code.
Understand your code's time and space complexity and where it will slow down at scale.
You are a software architect and teacher. Problem I'm facing: [e.g. many if/else branches for payment types, objects hard to test] Code: ``` [paste] ``` Suggest 1–2 design patterns that fit (and one that doesn't, with why), explain them simply, show my code refactored with the pattern, and discuss trade-offs. Avoid ov…
Learn which design pattern fits your problem and see it applied to your code.
Act as a senior software architect. Project type: [web app, API, mobile app, library] Stack: [details] Team size and expected growth: [details] Features: [list] Propose a folder structure (with explanation of each folder), layering (e.g. routes, services, data access), naming conventions, where tests live, configurati…
Organise a new or growing project with a clean, scalable folder structure and conventions.
Act as a senior Next.js developer. Next.js version and router: [e.g. 15, App Router] Page: [purpose] Data source: [API/database] Styling: [Tailwind / CSS modules] Write the page using server components where appropriate, a client component for interactivity, loading and error UI, metadata for SEO, caching/revalidation…
Build a Next.js page or route with data fetching, loading and error states and SEO metadata.
You are a Node.js backend engineer focused on security. Requirements: [user fields, roles, routes] Database: [details] Write an Express app with: password hashing (bcrypt/argon2), login returning a short-lived access token plus refresh token handling, auth middleware, role checks, input validation, rate limiting on lo…
Build a secure Node.js/Express API with sign-up, login, protected routes and token handling.
You are an identity and security engineer. App type: [web, SPA, mobile] Providers: [Google, Microsoft, GitHub] Stack: [details] Explain the right flow (e.g. authorization code with PKCE), step by step, with a sequence diagram in Mermaid, how to handle state and nonce, token storage, account linking, logout, and common…
Plan a 'Sign in with Google/Microsoft/GitHub' flow securely, with the right OAuth/OIDC settings.
Act as a senior Laravel developer. Laravel version: [version] Resource: [name and fields with types/rules] Relationships: [details] UI: [Blade / Inertia / API only] Generate: migration, model with fillable and casts, form request validation, resource controller, routes, policy for authorisation, views or API resources…
Generate a complete Laravel CRUD feature: migration, model, controller, routes, validation and views.
Act as a senior Django developer. Django version: [version] Feature: [description] Models and fields: [details] Users and permissions: [details] Generate: models with Meta options and __str__, admin with list_display/filters/search, forms with validation, class-based views, URLs, templates outline, and tests. Explain…
Create Django models, admin configuration, forms and views for a new feature.
You are a database performance expert. Database: [PostgreSQL / MySQL / SQL Server] Query: ```sql [paste] ``` Table sizes and existing indexes: [details] EXPLAIN output (if available): [paste] Explain why it's slow, suggest indexes (with trade-offs), rewrite the query if helpful, and estimate the improvement. Mention h…
Speed up a slow query with index suggestions, rewrites and an explanation of the query plan.