Parse FormData with Zod

main.ts

// Using Deno :P
import { z } from 'npm:zod'

const User = z.object({
  username: z.string(),
  email: z.string().email()
})

function getMissingFields(error: z.ZodError): string[] {
  const missingFields: string[] = []

  for (const errorIssue of error.issues) {
    if (errorIssue.code === 'invalid_type') {
      missingFields.push(errorIssue.path[0] as string)
    }
  }

  return missingFields
}

function main() {

  const f = new FormData()
  f.append('username', 'alice')
  f.append('email', '[email protected]')

  const u = User.safeParse(Object.fromEntries(f.entries()))

  // Handle error
  if (!u.success) {
    console.log(getMissingFields(u.error))
    return
  }

  console.log(u.data)
}

main()