Scalar for Hono

This middleware provides an easy way to render a beautiful API reference based on an OpenAPI/Swagger document with Hono.

hono-js

Installation

npm install @scalar/hono-api-reference

Usage

Set up Zod OpenAPI Hono or Hono OpenAPI and pass the configured URL to the Scalar middleware:

import { Hono } from 'hono'
import { Scalar } from '@scalar/hono-api-reference'

const app = new Hono()

// Use the middleware to serve the Scalar API Reference at /scalar
app.get('/scalar', Scalar({ url: '/doc' }))

export default app

The Hono middleware takes our universal configuration object, read more about configuration in the core package README.

Themes

The middleware comes with a custom theme for Hono. You can use one of the other predefined themes (alternate, default, moon, purple, solarized) or overwrite it with none. All themes come with a light and dark color scheme.

import { Scalar } from '@scalar/hono-api-reference'

// Switch the theme (or pass other options)
app.get('/scalar', Scalar({
  url: '/doc',
  theme: 'purple',
}))

Custom page title

There’s one additional option to set the page title:

import { Scalar } from '@scalar/hono-api-reference'

// Set a page title
app.get('/scalar', Scalar({
  url: '/doc',
  pageTitle: 'Awesome API',
}))

Custom CDN

You can use a custom CDN, default is https://cdn.jsdelivr.net/npm/@scalar/api-reference.

You can also pin the CDN to a specific version by specifying it in the CDN string like https://cdn.jsdelivr.net/npm/@scalar/api-reference@1.25.28

You can find all available CDN versions here

import { Scalar } from '@scalar/hono-api-reference'

app.get('/scalar', Scalar({ url: '/doc', pageTitle: 'Awesome API' }))

app.get('/scalar', Scalar({
  url: '/doc',
  cdn: 'https://cdn.jsdelivr.net/npm/@scalar/api-reference@latest',
}))

Markdown for LLMs

If you want to create a Markdown version of the API reference (for LLMs), install @scalar/openapi-to-markdown:

npm install @scalar/openapi-to-markdown

And add an additional route for it:

import { Hono } from 'hono'
import { createMarkdownFromOpenApi } from '@scalar/openapi-to-markdown'

const app = new Hono()

// Generate Markdown from your OpenAPI document
const markdown = await createMarkdownFromOpenApi(content)

/**
 * Register a route to serve the Markdown for LLMs
 *
 * Q: Why /llms.txt?
 * A: It's a proposal to standardise on using an /llms.txt file.
 *
 * @see https://llmstxt.org/
 */
app.get('/llms.txt', (c) => c.text(markdown))

export default app

Or, if you are using Zod OpenAPI Hono:

// Get the OpenAPI document
const content = app.getOpenAPI31Document({
  openapi: '3.1.0',
  info: { title: 'Example', version: 'v1' },
})

const markdown = await createMarkdownFromOpenApi(JSON.stringify(content))

app.get('/llms.txt', async (c) => {
  return c.text(markdown)
})

Community

We are API nerds. You too? Let’s chat on Discord: https://discord.gg/scalar

License

The source code in this repository is licensed under MIT.