HonoRequest

The HonoRequest is an object that can be taken from c.req which wraps a Request object.

param()

Get the values of path parameters.

// Captured params
app.get('/entry/:id', async (c) => {
  const id = c.req.param('id')
  // ...
})

// Get all params at once
app.get('/entry/:id/comment/:commentId', async (c) => {
  const { id, commentId } = c.req.param()
})

query()

Get querystring parameters.

// Query params
app.get('/search', async (c) => {
  const query = c.req.query('q')
})

// Get all params at once
app.get('/search', async (c) => {
  const { q, limit, offset } = c.req.query()
})

queries()

Get multiple querystring parameter values, e.g. /search?tags=A&tags=B

app.get('/search', async (c) => {
  // tags will be string[]
  const tags = c.req.queries('tags')
  // ...
})

header()

Get the request header value.

app.get('/', (c) => {
  const userAgent = c.req.header('User-Agent')
  return c.text(`Your user agent is ${userAgent}`)
})

WARNING

When c.req.header() is called with no arguments, all keys in the returned record are lowercase.

If you want to get the value of a header with an uppercase name, use c.req.header(“X-Foo”).

// ❌ Will not work
const headerRecord = c.req.header()
const foo = headerRecord['X-Foo']

// ✅ Will work
const foo = c.req.header('X-Foo')

parseBody()

Parse Request body of type multipart/form-data or application/x-www-form-urlencoded

app.post('/entry', async (c) => {
  const body = await c.req.parseBody()
  // ...
})

parseBody() supports the following behaviors.

Single file

const body = await c.req.parseBody()
const data = body['foo']

body['foo'] is (string | File).

If multiple files are uploaded, the last one will be used.

Multiple files

const body = await c.req.parseBody()
body['foo[]']

body['foo[]'] is always (string | File)[].

[] postfix is required.

Multiple files or fields with same name

If you have a input field that allows multiple <input type="file" multiple /> or multiple checkboxes with the same name <input type="checkbox" name="favorites" value="Hono"/>.

const body = await c.req.parseBody({ all: true })
body['foo']

all option is disabled by default.

• If body['foo'] is multiple files, it will be parsed to (string | File)[].
• If body['foo'] is single file, it will be parsed to (string | File).

Dot notation

If you set the dot option true, the return value is structured based on the dot notation.

Imagine receiving the following data:

const data = new FormData()
data.append('obj.key1', 'value1')
data.append('obj.key2', 'value2')

You can get the structured value by setting the dot option true:

const body = await c.req.parseBody({ dot: true })
// body is `{ obj: { key1: 'value1', key2: 'value2' } }`

json()

Parses the request body of type application/json

app.post('/entry', async (c) => {
  const body = await c.req.json()
  // ...
})

text()

Parses the request body of type text/plain

app.post('/entry', async (c) => {
  const body = await c.req.text()
  // ...
})

arrayBuffer()

Parses the request body as an ArrayBuffer

app.post('/entry', async (c) => {
  const body = await c.req.arrayBuffer()
  // ...
})

blob()

Parses the request body as a Blob.

app.post('/entry', async (c) => {
  const body = await c.req.blob()
  // ...
})

formData()

Parses the request body as a FormData.

app.post('/entry', async (c) => {
  const body = await c.req.formData()
  // ...
})

valid()

Get the validated data.

app.post('/posts', async (c) => {
  const { title, body } = c.req.valid('form')
  // ...
})

Available targets are below.

• form
• json
• query
• header
• cookie
• param

See the Validation section for usage examples.

routePath()

You can retrieve the registered path within the handler like this:

app.get('/posts/:id', (c) => {
  return c.json({ path: c.req.routePath })
})

If you access /posts/123, it will return /posts/:id:

{ "path": "/posts/:id" }

matchedRoutes()

It returns matched routes within the handler, which is useful for debugging.

app.use(async function logger(c, next) {
  await next()
  c.req.matchedRoutes.forEach(({ handler, method, path }, i) => {
    const name =
      handler.name ||
      (handler.length < 2 ? '[handler]' : '[middleware]')
    console.log(
      method,
      ' ',
      path,
      ' '.repeat(Math.max(10 - path.length, 0)),
      name,
      i === c.req.routeIndex ? '<- respond from here' : ''
    )
  })
})

path

The request pathname.

app.get('/about/me', async (c) => {
  const pathname = c.req.path // `/about/me`
  // ...
})

url

The request url strings.

app.get('/about/me', async (c) => {
  const url = c.req.url // `http://localhost:8787/about/me`
  // ...
})

method

The method name of the request.

app.get('/about/me', async (c) => {
  const method = c.req.method // `GET`
  // ...
})

raw

The raw Request object.

// For Cloudflare Workers
app.post('/', async (c) => {
  const metadata = c.req.raw.cf?.hostMetadata?
  // ...
})