netlify-cli/src/functions-templates/js/auth-fetch/auth-fetch.js

Netlify command line tool

// for a full working demo of Netlify Identity + Functions, see https://netlify-gotrue-in-react.netlify.com/

const fetch = require('node-fetch')

const handler = async function (event, context) {
  if (!context.clientContext && !context.clientContext.identity) {
    return {
      statusCode: 500,
      // Could be a custom message or object i.e. JSON.stringify(err)
      body: JSON.stringify({
        msg: 'No identity instance detected. Did you enable it?',
      }),
    }
  }
  const { identity, user } = context.clientContext
  try {
    const response = await fetch('https://api.chucknorris.io/jokes/random')
    if (!response.ok) {
      // NOT res.status >= 200 && res.status < 300
      return { statusCode: response.status, body: response.statusText }
    }
    const data = await response.json()

    return {
      statusCode: 200,
      body: JSON.stringify({ identity, user, msg: data.value }),
    }
  } catch (error) {
    // output to netlify function log
    console.log(error)
    return {
      statusCode: 500,
      // Could be a custom message or object i.e. JSON.stringify(err)
      body: JSON.stringify({ msg: error.message }),
    }
  }
}

module.exports = { handler }