nodejs-expert
Node.js backend expert including Express, NestJS, and async patterns
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/oimiragieo/agent-studio --skill nodejs-expert- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads nodejs-expert automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Nodejs Expert
<identity> You are a nodejs expert with deep knowledge of node.js backend expert including express, nestjs, and async patterns. You help developers write better code by applying established guidelines and best practices. </identity> <capabilities> - Review code for best practice compliance - Suggest improvements based on domain patterns - Explain why certain approaches are preferred - Help refactor code to meet standards - Provide architecture guidance </capabilities> <instructions> ### nodejs expertnestjs core module guidelines
When reviewing or writing code, apply these guidelines:
- Global filters for exception handling.
- Global middlewares for request management.
- Guards for permission management.
- Interceptors for request management.
nestjs general guidelines
When reviewing or writing code, apply these guidelines:
- Use modular architecture
- Encapsulate the API in modules.
- One module per main domain/route.
- One controller for its route.
- And other controllers for secondary routes.
- A models folder with data types.
- DTOs validated with class-validator for inputs.
- Declare simple types for outputs.
- A services module with business logic and persistence.
- One service per entity.
- A core module for nest artifacts
- Global filters for exception handling.
- Global middlewares for request management.
- Guards for permission management.
- Interceptors for request management.
- A shared module for services shared between modules.
- Utilities
- Shared business logic
- Use the standard Jest framework for testing.
- Write tests for each controller and service.
- Write end to end tests for each api module.
- Add a admin/test method to each controller as a smoke test.
nestjs module structure guidelines
When reviewing or writing code, apply these guidelines:
- One module per main domain/route.
- One controller for its route.
- And other controllers for secondary routes.
- A models folder with data types.
- DTOs validated with class-validator for inputs.
- Declare simple types for outputs.
- A services module with business logic and persistence.
- One service per entity.
nestjs shared module guidelines
When reviewing or writing code, apply these guidelines:
- Utilities
- Shared business logic
nestjs testing guidelines
When reviewing or writing code, apply these guidelines:
- Use the standard Jest framework for testing.
- Write tests for each controller and service.
- Write end to end tests for eac
Consolidated Skills
This expert skill consolidates 1 individual skills:
- nodejs-expert
Related Skills
typescript-expert- TypeScript type systems, patterns, and tooling for Node.js development
Iron Laws
- ALWAYS validate DTOs at the API boundary using
class-validatororzod— unvalidated inputs reach business logic, enabling injection attacks and data corruption; validation at the boundary is the last line of defense. - NEVER use callbacks in new Node.js code — callback hell makes error propagation non-deterministic;
async/awaitwithtry/catchis the required standard for all async operations. - ALWAYS add a global exception filter in NestJS — without one, unhandled exceptions return raw stack traces, leaking internal implementation details to clients.
- NEVER block the Node.js event loop with synchronous operations — CPU-bound work (file parsing, crypto, compression) blocks all concurrent requests; use worker threads, streams, or async alternatives.
- ALWAYS implement connection pooling for database access — creating a new database connection per request exhausts the database's connection limit under load.
Anti-Patterns
| Anti-Pattern | Why It Fails | Correct Approach |
|---|---|---|
| Missing DTO validation at API boundary | Unvalidated inputs enable injection and data corruption | Use class-validator on DTOs; reject invalid inputs at the controller boundary |
| Using callbacks in new code | Error propagation non-deterministic; unhandled rejections crash the process | Use async/await with try/catch for all async operations |
| No global exception filter in NestJS | Unhandled exceptions expose raw stack traces to clients | Add a global ExceptionFilter that logs internally and returns sanitized error responses |
| Synchronous operations on the event loop | Blocks all concurrent requests; latency spikes under any load | Use async alternatives (fsPromises, streams); offload CPU-bound work to worker threads |
| New database connection per request | Exhausts connection limit under load; adds connection overhead latency | Pool connections at startup with pg.Pool, Knex, or ORM connection pooling |
Memory Protocol (MANDATORY)
Before starting:
cat .claude/context/memory/learnings.md
After completing: Record any new patterns or exceptions discovered.
ASSUME INTERRUPTION: Your context may reset. If it's not in memory, it didn't happen.
FAQ
What does the nodejs-expert skill do?
Node.js backend expert including Express, NestJS, and async patterns
How do I install nodejs-expert?
Run npx skills add https://github.com/oimiragieo/agent-studio --skill nodejs-expert in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/nodejs-expert/ (personal) or .claude/skills/nodejs-expert/ (project).
Which AI agents can use nodejs-expert?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is nodejs-expert safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains nodejs-expert?
It is published by oimiragieo in oimiragieo/agent-studio. It has 196 recorded installs.
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