hono-core

Q: How do I install hono-core?

Run npx skills add https://github.com/bobmatnyc/claude-mpm-skills --skill hono-core 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/hono-core/ (personal) or .claude/skills/hono-core/ (project).

by bobmatnycDevOps & Cloud

Hono ultrafast web framework fundamentals - routing, context, handlers, and response patterns for multi-runtime deployment

Installs: 484
Last 24h: —
Trending rank: —
Security: Not audited

Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/bobmatnyc/claude-mpm-skills --skill hono-core

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 hono-core 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.

Hono - Ultrafast Web Framework

Overview

Hono is a small, simple, and ultrafast web framework built on Web Standards. It runs on Cloudflare Workers, Deno, Bun, Node.js, and more with the same codebase. The name means "flame" in Japanese.

Key Features:

Built on Web Standards (Request/Response/fetch)
Multi-runtime: Cloudflare Workers, Deno, Bun, Node.js, Vercel, AWS Lambda
Ultrafast routing with RegExpRouter
First-class TypeScript support
Lightweight (~14KB minified)
Rich middleware ecosystem

Installation:

# Create new project (recommended)
npm create hono@latest my-app

# Or install in existing project
npm install hono

# Runtime-specific adapters
npm install @hono/node-server  # Node.js

When to Use This Skill

Use Hono when:

Building APIs for edge/serverless environments (Cloudflare Workers, Vercel Edge)
Need multi-runtime portability (same code on Bun, Deno, Node.js)
Want TypeScript-first development with excellent type inference
Building lightweight, high-performance APIs
Need built-in middleware for common patterns (CORS, auth, compression)

Hono vs Other Frameworks:

Hono: Multi-runtime, Web Standards, ultrafast, edge-optimized
Express: Node.js only, larger ecosystem, slower
Fastify: Node.js only, schema-based, good performance
Elysia: Bun only, excellent performance, different API style

Core Concepts

Creating an Application

import { Hono } from 'hono'

const app = new Hono()

app.get('/', (c) => c.text('Hello Hono!'))

export default app

With TypeScript Generics (for bindings/variables):

type Bindings = {
  DATABASE_URL: string
  API_KEY: string
}

type Variables = {
  user: { id: string; name: string }
}

const app = new Hono<{ Bindings: Bindings; Variables: Variables }>()

The Context Object (c)

The context c provides access to request data and response methods:

app.get('/users/:id', async (c) => {
  // Request data
  const id = c.req.param('id')           // Path parameter
  const query = c.req.query('sort')       // Query parameter ?sort=asc
  const queries = c.req.queries('tags')   // Multiple: ?tags=a&tags=b
  const header = c.req.header('Authorization')
  const body = await c.req.json()         // JSON body
  const form = await c.req.formData()     // Form data

  // Environment (Cloudflare Workers bindings)
  const db = c.env.DATABASE_URL

  // Custom variables (set by middleware)
  const user = c.get('user')

  // Response methods
  return c.text('Plain text')
  return c.json({ id, name: 'User' })
  return c.html('<h1>Hello</h1>')
  return c.redirect('/login')
  return c.notFound()
})

Response Methods

// Text response
c.text('Hello', 200)

// JSON response
c.json({ message: 'Success' }, 201)
c.json({ error: 'Not found' }, 404)

// HTML response
c.html('<h1>Hello</h1>')

// Redirect
c.redirect('/login')           // 302 default
c.redirect('/login', 301)      // Permanent redirect

// Headers
c.header('X-Custom', 'value')
c.header('Cache-Control', 'max-age=3600')

// Streaming
c.streamText(async (stream) => {
  await stream.write('Hello ')
  await stream.write('World!')
})

// Raw Response
return new Response('Raw', { status: 200 })

Routing Patterns

Basic Routing

const app = new Hono()

// HTTP methods
app.get('/users', getUsers)
app.post('/users', createUser)
app.put('/users/:id', updateUser)
app.delete('/users/:id', deleteUser)
app.patch('/users/:id', patchUser)

// All methods
app.all('/webhook', handleWebhook)

// Custom methods
app.on('PURGE', '/cache', purgeCache)
app.on(['GET', 'POST'], '/form', handleForm)

Path Parameters

// Single parameter
app.get('/users/:id', (c) => {
  const id = c.req.param('id')
  return c.json({ id })
})

// Multiple parameters
app.get('/posts/:postId/comments/:commentId', (c) => {
  const { postId, commentId } = c.req.param()
  return c.json({ postId, commentId })
})

// Optional parameter
app.get('/api/animal/:type?', (c) => {
  const type = c.req.param('type') || 'all'
  return c.json({ type })
})

// Regex validation
app.get('/posts/:id{[0-9]+}', (c) => {
  const id = c.req.param('id')  // Only numeric IDs
  return c.json({ id })
})

// Wildcards
app.get('/files/*', (c) => {
  const path = c.req.param('*')  // Everything after /files/
  return c.text(`File: ${path}`)
})

Route Grouping

// Using app.route()
const api = new Hono()
api.get('/users', getUsers)
api.get('/posts', getPosts)

const app = new Hono()
app.route('/api/v1', api)  // /api/v1/users, /api/v1/posts

// Using basePath()
const v2 = new Hono().basePath('/api/v2')
v2.get('/users', getUsers)  // /api/v2/users

// Chaining
app
  .get('/a', handlerA)
  .post('/b', handlerB)
  .delete('/c', handlerC)

Route Organization (Multi-File)

// routes/users.ts
import { Hono } from 'hono'

const users = new Hono()

users.get('/', async (c) => {
  return c.json({ users: [] })
})

users.post('/', async (c) => {
  const body = await c.req.json()
  return c.json({ created: body }, 201)
})

users.get('/:id', async (c) => {
  const id = c.req.param('id')
  return c.json({ id })
})

export default users

// app.ts
import { Hono } from 'hono'
import users from './routes/users'
import posts from './routes/posts'

const app = new Hono()

app.route('/users', users)
app.route('/posts', posts)

export default app

Handler Patterns

Inline Handlers

// Simple handler
app.get('/hello', (c) => c.text('Hello!'))

// Async handler
app.get('/users', async (c) => {
  const users = await fetchUsers()
  return c.json({ users })
})

// Multiple handlers (middleware chain)
app.get('/admin', authenticate, authorize, (c) => {
  return c.json({ admin: true })
})

Using Factory for Type-Safe Handlers

import { createFactory } from 'hono/factory'

const factory = createFactory<{ Bindings: Bindings }>()

// Create typed handler
const getUser = factory.createHandlers(async (c) => {
  const id = c.req.param('id')
  const db = c.env.DATABASE_URL  // Typed!
  return c.json({ id })
})

app.get('/users/:id', ...getUser)

Error Handling

Built-in Error Handling

import { HTTPException } from 'hono/http-exception'

app.get('/users/:id', async (c) => {
  const user = await findUser(c.req.param('id'))

  if (!user) {
    throw new HTTPException(404, { message: 'User not found' })
  }

  return c.json(user)
})

// Global error handler
app.onError((err, c) => {
  console.error(`${err}`)

  if (err instanceof HTTPException) {
    return err.getResponse()
  }

  return c.json({ error: 'Internal Server Error' }, 500)
})

// Not found handler
app.notFound((c) => {
  return c.json({ error: 'Route not found' }, 404)
})

Custom Error Classes

class ValidationError extends HTTPException {
  constructor(errors: string[]) {
    super(400, {
      message: 'Validation failed',
      cause: errors
    })
  }
}

class AuthenticationError extends HTTPException {
  constructor() {
    super(401, { message: 'Authentication required' })
  }
}

Runtime-Specific Exports

Cloudflare Workers

// src/index.ts
import { Hono } from 'hono'

const app = new Hono()
app.get('/', (c) => c.text('Hello Cloudflare!'))

export default app

Node.js

// src/index.ts
import { serve } from '@hono/node-server'
import { Hono } from 'hono'

const app = new Hono()
app.get('/', (c) => c.text('Hello Node!'))

serve({
  fetch: app.fetch,
  port: 3000
})

Bun

// src/index.ts
import { Hono } from 'hono'

const app = new Hono()
app.get('/', (c) => c.text('Hello Bun!'))

export default {
  port: 3000,
  fetch: app.fetch
}

Deno

// main.ts
import { Hono } from 'npm:hono'

const app = new Hono()
app.get('/', (c) => c.text('Hello Deno!'))

Deno.serve(app.fetch)

Best Practices

Write Handlers Inline (Not Controllers)

// CORRECT: Inline handlers with proper type inference
app.get('/users/:id', async (c) => {
  const id = c.req.param('id')  // Type: string
  return c.json({ id })
})

// AVOID: Controller-style (loses type inference)
class UserController {
  getUser(c: Context) {
    const id = c.req.param('id')  // Type: string | undefined
    return c.json({ id })
  }
}

Use Modular Routes

// CORRECT: Split routes by domain
// routes/users.ts
export const users = new Hono()
  .get('/', listUsers)
  .post('/', createUser)
  .get('/:id', getUser)

// app.ts
app.route('/users', users)

Type Everything

// Define your environment bindings
type Bindings = {
  DATABASE_URL: string
  JWT_SECRET: string
  MY_KV: KVNamespace
}

// Pass to Hono
const app = new Hono<{ Bindings: Bindings }>()

// Now c.env is fully typed
app.get('/', (c) => {
  const url = c.env.DATABASE_URL  // string
  const kv = c.env.MY_KV          // KVNamespace
})

Quick Reference

Common Context Methods

Method	Description	Example
`c.req.param(name)`	Get path parameter	`c.req.param('id')`
`c.req.query(name)`	Get query parameter	`c.req.query('page')`
`c.req.header(name)`	Get request header	`c.req.header('Authorization')`
`c.req.json()`	Parse JSON body	`await c.req.json()`
`c.req.formData()`	Parse form data	`await c.req.formData()`
`c.text(str, status)`	Text response	`c.text('OK', 200)`
`c.json(obj, status)`	JSON response	`c.json({}, 201)`
`c.html(str)`	HTML response	`c.html('<h1>Hi</h1>')`
`c.redirect(url)`	Redirect	`c.redirect('/login')`
`c.header(k, v)`	Set response header	`c.header('X-Custom', 'val')`
`c.set(key, val)`	Set context variable	`c.set('user', user)`
`c.get(key)`	Get context variable	`c.get('user')`
`c.env`	Environment bindings	`c.env.API_KEY`

HTTP Methods

app.get(path, ...handlers)
app.post(path, ...handlers)
app.put(path, ...handlers)
app.delete(path, ...handlers)
app.patch(path, ...handlers)
app.options(path, ...handlers)
app.head(path, ...handlers)
app.all(path, ...handlers)
app.on(method, path, ...handlers)

Related Skills

hono-middleware - Middleware patterns and composition
hono-validation - Request validation with Zod
hono-rpc - Type-safe RPC client
hono-testing - Testing patterns
hono-jsx - Server-side JSX rendering
hono-cloudflare - Cloudflare Workers deployment

Version: Hono 4.x Last Updated: January 2025 License: MIT

FAQ

What does the hono-core skill do?

Hono ultrafast web framework fundamentals - routing, context, handlers, and response patterns for multi-runtime deployment

How do I install hono-core?

Run npx skills add https://github.com/bobmatnyc/claude-mpm-skills --skill hono-core 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/hono-core/ (personal) or .claude/skills/hono-core/ (project).

Which AI agents can use hono-core?

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 hono-core 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 hono-core?

It is published by bobmatnyc in bobmatnyc/claude-mpm-skills. It has 484 recorded installs.

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hono-core

Install

Install

Describe the task

Review the result

SKILL.md

Hono - Ultrafast Web Framework

Overview

When to Use This Skill

Core Concepts

Creating an Application

The Context Object (c)

Response Methods

Routing Patterns

Basic Routing

Path Parameters

Route Grouping

Route Organization (Multi-File)

Handler Patterns

Inline Handlers

Using Factory for Type-Safe Handlers

Error Handling

Built-in Error Handling

Custom Error Classes

Runtime-Specific Exports

Cloudflare Workers

Node.js

Bun

Deno

Best Practices

Write Handlers Inline (Not Controllers)

Use Modular Routes

Type Everything

Quick Reference

Common Context Methods

HTTP Methods

Related Skills

FAQ

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