Nodejs Backend Patterns
ever-works/ever-works
Build production-ready Node.js backend services with Express/Fastify, implementing middleware patterns, error handling, authentication, database integration, and API design best practices.
A skill your agent uses when adding or changing routes, schemas, or plugins in this Fastify API — keep endpoints validated, typed, and testable.
Install Fastify API Design
$ npx skills add johnku2011/boilerplates-with-ai-skills --skill fastify-api-design -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install johnku2011/boilerplates-with-ai-skills fastify-api-design --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/johnku2011/boilerplates-with-ai-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/boilerplates/fastify-api/skills/fastify-api-design .claude/skills/fastify-api-design && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "fastify-api-design" agent skill from https://github.com/johnku2011/boilerplates-with-ai-skills/tree/main/boilerplates/fastify-api/skills/fastify-api-design into .claude/skills/fastify-api-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fastify-api-design", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/johnku2011/boilerplates-with-ai-skills/tree/main/boilerplates/fastify-api/skills/fastify-api-designType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add johnku2011/boilerplates-with-ai-skills --skill fastify-api-design -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install johnku2011/boilerplates-with-ai-skills fastify-api-design --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/johnku2011/boilerplates-with-ai-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/boilerplates/fastify-api/skills/fastify-api-design .agents/skills/fastify-api-design && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "fastify-api-design" agent skill from https://github.com/johnku2011/boilerplates-with-ai-skills/tree/main/boilerplates/fastify-api/skills/fastify-api-design into .agents/skills/fastify-api-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fastify-api-design", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add johnku2011/boilerplates-with-ai-skills --skill fastify-api-design -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install johnku2011/boilerplates-with-ai-skills fastify-api-design --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/johnku2011/boilerplates-with-ai-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/boilerplates/fastify-api/skills/fastify-api-design .cursor/skills/fastify-api-design && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "fastify-api-design" agent skill from https://github.com/johnku2011/boilerplates-with-ai-skills/tree/main/boilerplates/fastify-api/skills/fastify-api-design into .cursor/skills/fastify-api-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fastify-api-design", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/johnku2011/boilerplates-with-ai-skills.git --path boilerplates/fastify-api/skills/fastify-api-design--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add johnku2011/boilerplates-with-ai-skills --skill fastify-api-design -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install johnku2011/boilerplates-with-ai-skills fastify-api-design --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/johnku2011/boilerplates-with-ai-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/boilerplates/fastify-api/skills/fastify-api-design .gemini/skills/fastify-api-design && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "fastify-api-design" agent skill from https://github.com/johnku2011/boilerplates-with-ai-skills/tree/main/boilerplates/fastify-api/skills/fastify-api-design into .gemini/skills/fastify-api-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fastify-api-design", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install johnku2011/boilerplates-with-ai-skills fastify-api-designInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add johnku2011/boilerplates-with-ai-skills --skill fastify-api-design -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/johnku2011/boilerplates-with-ai-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/boilerplates/fastify-api/skills/fastify-api-design .github/skills/fastify-api-design && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "fastify-api-design" agent skill from https://github.com/johnku2011/boilerplates-with-ai-skills/tree/main/boilerplates/fastify-api/skills/fastify-api-design into .github/skills/fastify-api-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fastify-api-design", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add johnku2011/boilerplates-with-ai-skills --skill fastify-api-design -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install johnku2011/boilerplates-with-ai-skills fastify-api-design --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/johnku2011/boilerplates-with-ai-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/boilerplates/fastify-api/skills/fastify-api-design .opencode/skills/fastify-api-design && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "fastify-api-design" agent skill from https://github.com/johnku2011/boilerplates-with-ai-skills/tree/main/boilerplates/fastify-api/skills/fastify-api-design into .opencode/skills/fastify-api-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fastify-api-design", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
fastify-api-design- GitHub stars
- 240
- Token cost
- ~420 tokens
- SKILL.md length
- 194 words
- Files
- 1
- Skills in repo
- 18
- Repo updated
- First seen
- Licence
- MIT
At a glance
A skill your agent uses when adding or changing routes, schemas, or plugins in this Fastify API — keep endpoints validated, typed, and testable.
- Works in 5 steps: Register routes on the app returned by… → Define JSON schemas for request/response… → Return correct status codes (200/201… → …
- Changing routes
- SKILL.md covers Overview, Process, Plugin Order and Testing, plus 2 more sections
- Calls npm
What it does
Fastify API Design is an agent skill from johnku2011/boilerplates-with-ai-skills. Use when adding or changing routes, schemas, or plugins in this Fastify API — keep endpoints validated, typed, and testable.
Its SKILL.md is about 420 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts. Compatibility notes: Fastify ESM API in this boilerplate
It sits in Backend & APIs, covering API design. It works with Fastify. The licence is MIT.
When your agent uses it
- Changing routes
- Plugins in this Fastify API — keep endpoints validated
Example prompts
- “/fastify-api-design”
Requirements
- Compatibility (from SKILL.md): Fastify ESM API in this boilerplate
- Pre-approved tools (allowed-tools): Read
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- Register routes on the app returned by createApp() in src/app.js.
- Define JSON schemas for request/response when the payload shape matters.
- Return correct status codes (200/201 success, 400 client error, 404 not found).
- Use Fastify's built-in error handler; do not leak stack traces in production.
- Add a test/ case that starts the app on port 0 and asserts responses.
What it can do on your machine
Read from SKILL.md and the folder at commit 475dc6a. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves these tools, so the agent can use them without asking each time:
Read
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
npm
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use npm, which can reach the network depending on how they are called.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Compatibility
Fastify ESM API in this boilerplate
From compatibility in the SKILL.md frontmatter.
Context cost
Fastify API Design loads about 420 tokens when it runs. Until then it costs about 36 tokens; SKILL.md has 194 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from johnku2011/boilerplates-with-ai-skills at commit 475dc6a, republished under its MIT licence (© johnku2011). 194 words, ~420 tokens.
Download SKILL.mdSave it as
.claude/skills/fastify-api-design/SKILL.md (or your agent's skills folder).- name
- fastify-api-design
- description
- Use when adding or changing routes, schemas, or plugins in this Fastify API — keep endpoints validated, typed, and testable.
- allowed-tools
- Read
- compatibility
- Fastify ESM API in this boilerplate
- license
- MIT
- metadata.stack
- fastify
Fastify API Design
Overview
Keep the Fastify app small, testable, and schema-first. Build on the exported
createApp() factory so tests can inject the server without binding a fixed port.
Process
- Register routes on the app returned by
createApp()insrc/app.js. - Define JSON schemas for request/response when the payload shape matters.
- Return correct status codes (200/201 success, 400 client error, 404 not found).
- Use Fastify's built-in error handler; do not leak stack traces in production.
- Add a
test/case that starts the app on port0and asserts responses.
Plugin Order
- Core plugins (cors, sensible) if needed
- Route registration
- Global error handler
Testing
- Integration tests:
app.listen({ port: 0 }),fetchagainst127.0.0.1. - Extract pure helpers for unit tests when logic grows beyond route handlers.
- Run
npm testbefore every commit.
Guidelines
- Prefer route-level schemas over ad-hoc validation in handlers.
- Keep handlers thin; move business logic to testable functions.
- Read secrets from environment variables at startup, not from requests.
- Prefer explicit routes over catch-all handlers.
Anti-patterns
- Bypassing Fastify validation with unvalidated
request.bodyaccess. - Starting the server inside
createApp()— keep listen inserver.jsonly. - Global mutable state shared across requests.
© johnku2011, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in boilerplates/fastify-api/skills/fastify-api-design of johnku2011/boilerplates-with-ai-skills.
Open the folder on GitHubat commit 475dc6a
Compare with similar skills
Fastify API Design next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Fastify API Design this skilljohnku2011/boilerplates-with-ai-skills | 240 | — | ~420 | Automated safety check: Pass | MIT | |
| Nodejs Backend Patternsever-works/ever-works | 158 | 18 repos | ~4k | Automated safety check: Pass | AGPL-3.0 | |
| Nestjsericrisco/rsc-harness | 167 | — | ~2.9k | Automated safety check: Pass | MIT | |
| API ExtractorEmeaAppGbb/spec2cloud | 100 | — | ~2.4k | Automated safety check: Pass | MIT | |
| API DesignerJeffallan/claude-skills | 12k | 2 repos | ~2k | Automated safety check: Pass | MIT | |
| Pangolin CRUD Endpointsfosrl/pangolin | 23k | — | ~461 | Automated safety check: Pass | Custom licence |
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Related
Works with
Categories
Questions about Fastify API Design
What does Fastify API Design do?
A skill your agent uses when adding or changing routes, schemas, or plugins in this Fastify API — keep endpoints validated, typed, and testable. Fastify API Design is an agent skill from johnku2011/boilerplates-with-ai-skills. Use when adding or changing routes, schemas, or plugins in this Fastify API — keep endpoints validated, typed, and testable.
When should I use Fastify API Design?
Fastify API Design fits situations like: changing routes; plugins in this Fastify API — keep endpoints validated.
How do I install Fastify API Design in Claude Code?
Run `npx skills add johnku2011/boilerplates-with-ai-skills --skill fastify-api-design -a claude-code`. Or copy the skill folder (boilerplates/fastify-api/skills/fastify-api-design in johnku2011/boilerplates-with-ai-skills) into .claude/skills/fastify-api-design in your project. Claude Code loads it when a task matches its description.
How do I install Fastify API Design in Codex?
Run `npx skills add johnku2011/boilerplates-with-ai-skills --skill fastify-api-design -a codex`. Or copy the skill folder (boilerplates/fastify-api/skills/fastify-api-design in johnku2011/boilerplates-with-ai-skills) into .agents/skills/fastify-api-design in your project. Codex loads it when a task matches its description.
Can I use Fastify API Design in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add johnku2011/boilerplates-with-ai-skills --skill fastify-api-design -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/fastify-api-design, .gemini/skills/fastify-api-design, .github/skills/fastify-api-design and .opencode/skills/fastify-api-design in your project.
What does Fastify API Design need to run?
Going by SKILL.md and its folder, Fastify API Design needs the command-line tools its instructions call (npm). Its frontmatter pre-approves these tools: Read. Compatibility (from SKILL.md): Fastify ESM API in this boilerplate.
Does Fastify API Design access the network?
SKILL.md contains no URLs. Its commands use npm, which can reach the network depending on how they are called. This is read from the text; nothing was executed.
Is Fastify API Design safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Fastify API Design use?
Fastify API Design is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Fastify API Design use?
About 420 tokens (SKILL.md is roughly 1.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Fastify API Design?
Skills that share tags, products or a category with Fastify API Design: Nodejs Backend Patterns (ever-works/ever-works, 158 stars), Nestjs (ericrisco/rsc-harness, 167 stars), API Extractor (EmeaAppGbb/spec2cloud, 100 stars) and API Designer (Jeffallan/claude-skills, 12k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Fastify API Design?
johnku2011 (a GitHub user) maintains it in johnku2011/boilerplates-with-ai-skills, which has 240 GitHub stars. The repository holds 18 skills in this directory. The repository was last updated on August 24, 2026.
Source: johnku2011/boilerplates-with-ai-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.