Multiple collections in Angular-in-memory-web-api

Just return it an object with both arrays. In the example from Angular, you see something like

createDb() {
  let heroes = [ .. ]
  return { heroes }
}

If you don’t already know this, { heroes } is just shorthand for writing { heroes: heroes }. So if you have two collections, then just add it as a another property

createDb() {
  let heroes = [ .. ];
  let crises = [ .. ];
  return { heroes, crises };
  // or { heroes: heroes, crises: crises }
}

The name of the property returned will be used for the path in the URL. So you can use

/api/heroes/1
/api/crises/1