Is it recommended to define the JSON format of an API request as an interface in TypeScript for accessing data within the response?

As a beginner in typescript, one area that I'm struggling to find information on is how to handle types for API call responses.

For example, when making a GET request to an API and receiving a JSON object like:

{
 name: "john",
 age: 12
}

In my code, if I want to access response.name, do I need to define an interface like the following to avoid any linter errors?

interface Response {
 name: string,
 age: number 
}

Or is there a simpler way to tackle this issue? Some API calls can return JSON objects with more than 10 lines of data, so creating interfaces for each type of response seems cumbersome. Another idea I had was to create interfaces with only the values I plan to use, but I'm unsure if this is the best approach. Any insights or guidance would be greatly appreciated!

Answer №1

When considering the definition of Response, it can be seen as a versatile type that accommodates various API json responses.

interface IResponse {
  [key: string]: any
}

With this in place, you are able to confidently access response.name without encountering any errors, and even response.not_exist_property is considered valid.

A recommended approach would be to specify specific types for different API response structures:

interface GetUserResponse {
  name: string,
  age: number,
}

This would apply to scenarios like GET /users/:id.

If needed, tools such as this tool can aid in converting json responses into Typescript types.

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