fastify
Provides comprehensive guidance for Fastify framework including routing, plugins, JSON schema validation, hooks, serialization, and performance optimization. Use when the user asks about Fastify, needs to create high-performance Node.js applications, implement plugins, or optimize API performance.
Best use case
fastify is best used when you need a repeatable AI agent workflow instead of a one-off prompt. It is especially useful for teams working in multi. Provides comprehensive guidance for Fastify framework including routing, plugins, JSON schema validation, hooks, serialization, and performance optimization. Use when the user asks about Fastify, needs to create high-performance Node.js applications, implement plugins, or optimize API performance.
Provides comprehensive guidance for Fastify framework including routing, plugins, JSON schema validation, hooks, serialization, and performance optimization. Use when the user asks about Fastify, needs to create high-performance Node.js applications, implement plugins, or optimize API performance.
Users should expect a more consistent workflow output, faster repeated execution, and less time spent rewriting prompts from scratch.
Practical example
Example input
Use the "fastify" skill to help with this workflow task. Context: Provides comprehensive guidance for Fastify framework including routing, plugins, JSON schema validation, hooks, serialization, and performance optimization. Use when the user asks about Fastify, needs to create high-performance Node.js applications, implement plugins, or optimize API performance.
Example output
A structured workflow result with clearer steps, more consistent formatting, and an output that is easier to reuse in the next run.
When to use this skill
- Use this skill when you want a reusable workflow rather than writing the same prompt again and again.
When not to use this skill
- Do not use this when you only need a one-off answer and do not need a reusable workflow.
- Do not use it if you cannot install or maintain the related files, repository context, or supporting tools.
Installation
Claude Code / Cursor / Codex
Manual Installation
- Download SKILL.md from GitHub
- Place it in
.claude/skills/fastify/SKILL.mdinside your project - Restart your AI agent — it will auto-discover the skill
How fastify Compares
| Feature / Agent | fastify | Standard Approach |
|---|---|---|
| Platform Support | Not specified | Limited / Varies |
| Context Awareness | High | Baseline |
| Installation Complexity | Unknown | N/A |
Frequently Asked Questions
What does this skill do?
Provides comprehensive guidance for Fastify framework including routing, plugins, JSON schema validation, hooks, serialization, and performance optimization. Use when the user asks about Fastify, needs to create high-performance Node.js applications, implement plugins, or optimize API performance.
Where can I find the source code?
You can find the source code on GitHub using the link provided at the top of the page.
SKILL.md Source
## When to use this skill
Use this skill whenever the user wants to:
- Build high-performance Node.js HTTP services with Fastify
- Use JSON Schema for request/response validation and serialization
- Create and compose Fastify plugins with encapsulation
- Configure logging, TypeScript, and production deployments
## How to use this skill
### Workflow
1. **Create server** — instantiate Fastify with options (logging, etc.)
2. **Register plugins** — add functionality via the plugin system
3. **Define routes with schemas** — validate requests and serialize responses
4. **Test and deploy** — use `fastify.inject()` for testing, deploy with process manager
### Quick Start Example
```javascript
const fastify = require('fastify')({ logger: true });
// Register plugins
fastify.register(require('@fastify/cors'));
fastify.register(require('@fastify/helmet'));
// Route with JSON Schema validation
fastify.post('/api/items', {
schema: {
body: {
type: 'object',
required: ['name', 'price'],
properties: {
name: { type: 'string', minLength: 1 },
price: { type: 'number', minimum: 0 },
},
},
response: {
201: {
type: 'object',
properties: {
id: { type: 'integer' },
name: { type: 'string' },
price: { type: 'number' },
},
},
},
},
handler: async (request, reply) => {
const item = await createItem(request.body);
reply.code(201).send(item);
},
});
fastify.get('/api/items/:id', async (request, reply) => {
const item = await getItem(request.params.id);
if (!item) {
reply.code(404).send({ error: 'Not found' });
return;
}
return item;
});
fastify.listen({ port: 3000, host: '0.0.0.0' });
```
### Plugin Pattern
```javascript
// plugins/db.js
async function dbPlugin(fastify, options) {
const pool = createPool(options.connectionString);
fastify.decorate('db', pool);
fastify.addHook('onClose', async () => pool.end());
}
module.exports = require('fastify-plugin')(dbPlugin);
// app.js
fastify.register(require('./plugins/db'), {
connectionString: process.env.DATABASE_URL,
});
```
### Error Handling
```javascript
fastify.setErrorHandler((error, request, reply) => {
request.log.error(error);
const statusCode = error.statusCode || 500;
reply.code(statusCode).send({
error: error.message,
statusCode,
});
});
```
## Best Practices
- Define JSON Schema for all request bodies and responses — enables fast serialization
- Use `fastify-plugin` to break encapsulation when sharing decorators across scopes
- Leverage built-in Pino logger; avoid `console.log` in production
- Use hooks (`onRequest`, `preHandler`) for cross-cutting concerns
- Test routes with `fastify.inject()` without starting a server
## Reference
- Official documentation: https://fastify.dev/docs/latest/
## Keywords
fastify, Node.js, high performance, JSON schema, plugins, serialization, hooks, Pino loggerRelated Skills
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