Extracting form data

index.js

/*
  name: 123
  name: 456
  name2: 'abc'
*/

const formData = await request.formData();

// Basic, does not allow multiples, in case of multiples takes last
// { name: 456, name2: 'abc' }
const data = Object.fromEntries(formData);

// Creates an array for each key
// { name: [123,456], name2: ['abc'] }
const data = [...formData.entries()].reduce((acc, [key, value]) => (acc[key] = [...acc[key] ?? [], value] , acc), {})

// Flattens to a regular prop if the array has length 1
// { name: [123,456], name2: 'abc' }
const data = [...formData.entries()].reduce((acc, [key, value]) => (acc.hasOwnProperty(key) ?  acc[key] = Array.isArray(acc[key]) ? [...acc[key], value] : [acc[key], value] : acc[key] = value, acc), {})

Counter intuitive, but the thirds approach works faster than the second one.
But this has the side effect that some props are arrays and some are not.

Most use cases will be covered by the first one though (simple basic one) which is a lot faster.