Create logic with JSON and store it in your backend

Expry is a JavaScript library for creating logic using JSON syntax. It enables you to store your code in your backend, making it ideal for use cases such as forms and validation rules.

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const expression = {
  name: { $concat: ["$name", " ", "$surname"] },
  mostFavoriteSports: {
    $filter: {
      input: "$sports",
      as: "sport",
      cond: { $gt: ["$$sport.rating", 8] },
    },
  },
};

const variables = {
  name: "Martí",
  surname: "Serra",
  sports: [
    { name: "football", rating: 9 },
    { name: "basketball", rating: 10 },
    { name: "tennis", rating: 5 },
    { name: "swimming", rating: 7 },
  ],
};

{
  "name": "Martí Serra",
  "mostFavoriteSports": [
    { "name": "football", "rating": 9 },
    { "name": "basketball", "rating": 10 }
  ]
}