MS Azure Function to ask Wolfram Alpha a question

wolfram.js

const fetch = require('node-fetch');
const credentials = require('./credentials');

module.exports = async function(context, req) {
  if (req.query.searchTerm || (req.body && req.body.searchTerm)) {
    const searchTerm = req.query.searchTerm || 
          req.body.searchTerm;
    let url = `http://api.wolframalpha.com/v2/query?input=${searchTerm}&appid=${
      credentials.wolfram
    }`;
    await fetch(url)
      .then(res => res.text())
      .then(text => {
        context.res = {
          status: 200,
          headers: { 'Content-Type': 'text/plain' },
          body: text
        };
        context.done();
      });
  } else {
    context.res = {
      status: 400,
      body: 'Please pass a name on the query string or in the request body'
    };
  }

  context.done();
};