What is the process for transforming a key-value object from JavaScript to TypeScript?

Question

What is the process for transforming a key-value object from JavaScript to TypeScript?

I am currently facing a challenge in converting a JavaScript object into a TypeScript version as part of our code refactoring process :( I am struggling to figure out how to properly migrate a JS JSON object into a correct TS format. For instance, consider the following JS object:

JS Object:
{
  "filter": {
    "price": {
      "$gte": 10,
      "$lte": 100
    },
    "symbol": "appl"
  },
  "sort": {
    "createdAt": -1
  }
}

In JavaScript, we can easily declare a params = {} and populate it like params.filter[price] = .....

However, the challenge arises when trying to perform the same task in TypeScript, as the compiler requires explicit type definitions. This becomes tricky due to the dynamic nature of the values, which can be strings, integers, or even objects.

If anyone has any ideas or suggestions on how to tackle this, I would be extremely grateful! Thank you in advance!

javascript typescript

Answer 1

Answer №1

If you need to specify the type of a particular object, consider using the VSCode extension called "Paste JSON as Code" or visit a website that can generate TypeScript interfaces based on your object structure .

Answer 2

If you need to specify the type of a particular object, consider using the VSCode extension called "Paste JSON as Code" or visit a website that can generate TypeScript interfaces based on your object structure .

Answer 3

Answer №2

To parse JSON data, you don't necessarily need to create a specific type or interface. Here is an example of parsing JSON without defining an interface:

const json = `{
  "filter": {
    "price": {
      "$gte": 10,
      "$lte": 100
    },
    "symbol": "appl"
  },
  "sort": {
    "createdAt": -1
  }
}`

const data = JSON.parse(json)

console.log(data)

However, if you prefer to create an interface for better type checking, you can do so. Keep in mind that the interface only enforces type checking and doesn't validate the data structure:

interface Data {
  filter: {
    price: {
      $gte: number
      $lte: number
    }
    symbol: string
  }
  sort: {
    createdAt: number
  }
}

const json = `{
  "filter": {
    "price": {
      "$gte": 10,
      "$lte": 100
    },
    "symbol": "appl"
  },
  "sort": {
    "createdAt": -1
  }
}`

const data: Data = JSON.parse(json)

console.log(data)
console.log(data.filter.symbol)

Answer 4

To parse JSON data, you don't necessarily need to create a specific type or interface. Here is an example of parsing JSON without defining an interface:

const json = `{
  "filter": {
    "price": {
      "$gte": 10,
      "$lte": 100
    },
    "symbol": "appl"
  },
  "sort": {
    "createdAt": -1
  }
}`

const data = JSON.parse(json)

console.log(data)

However, if you prefer to create an interface for better type checking, you can do so. Keep in mind that the interface only enforces type checking and doesn't validate the data structure:

interface Data {
  filter: {
    price: {
      $gte: number
      $lte: number
    }
    symbol: string
  }
  sort: {
    createdAt: number
  }
}

const json = `{
  "filter": {
    "price": {
      "$gte": 10,
      "$lte": 100
    },
    "symbol": "appl"
  },
  "sort": {
    "createdAt": -1
  }
}`

const data: Data = JSON.parse(json)

console.log(data)
console.log(data.filter.symbol)

Answer 5

Answer №3

Using TypeScript interfaces is a great way to achieve this. Generating TS code can be easily done with tools like

TypeScript Code

export interface Pokedex {
    filters: FilterTypes;
    sorting: SortTypes;
}

export interface FilterTypes {
    priceRange: { [key: string]: number };
    symbol: string;
}

export interface SortTypes {
    createdAt: number;
}

JavaScript Code

{
  "filters": {
    "priceRange": {
      "$gte": 20,
      "$lte": 200
    },
    "symbol": "tech"
  },
  "sorting": {
    "createdAt": -1
  }
}

Answer 6

Using TypeScript interfaces is a great way to achieve this. Generating TS code can be easily done with tools like

TypeScript Code

export interface Pokedex {
    filters: FilterTypes;
    sorting: SortTypes;
}

export interface FilterTypes {
    priceRange: { [key: string]: number };
    symbol: string;
}

export interface SortTypes {
    createdAt: number;
}

JavaScript Code

{
  "filters": {
    "priceRange": {
      "$gte": 20,
      "$lte": 200
    },
    "symbol": "tech"
  },
  "sorting": {
    "createdAt": -1
  }
}

What is the process for transforming a key-value object from JavaScript to TypeScript?

Answer №1

Answer №2

Answer №3

TypeScript Code

JavaScript Code

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