Type declaration for an array of objects with string-based keys?

Question

My web service returns an array of objects that looks like this:

[ 
  {
   "abc": "test 1"
  },
  {
   "def": "test 2"
  },
  {
   "ghi": "test 3"
  }
]

Now I want to declare a TypeScript interface for this result. But I have no idea how to do that because the key of each object can be string whose name varies.

Specifically:

An object has exactly one property.
The key of that property can have any name.
The value of the property is a string.

It may be possible to write a more specific type for this, but we don't have enough details to say so with accuracy. Which parts of the example you gave can vary and which are fixed? Are the keys always those three? Do the objects always have exactly one key? Are the values in the objects always strings? Try to post a specification of the type in plain English as part of your question, and then maybe someone can come along and turn that into Typescript. — Silvio Mayolo
– Silvio Mayolo, Commented Jan 26, 2021 at 13:35

user13258211 · Accepted Answer · 2021-01-26 13:39:51Z

3

From the code you provided, I suggest using:

const a: { [key: string]: string }[] = [ 
  {
   "abc": "test 1"
  },
  {
   "def": "test 2"
  },
  {
   "ghi": "test 3"
  }
]

It is a string indexed object with string values.

answered Jan 26, 2021 at 13:39

user13258211

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1 Comment

Nishant Over a year ago

Could also use Record<string, string>[]

Fatih Ersoy · Accepted Answer · 2021-01-26 14:26:37Z

1

Probably not the best solution, just in case if you want interface strictly:

interface webResponse{
    [key: string]: string;
}

let myvalue= new Array<webResponse>();

myvalue[0] = {["asdas"]: 'qwerty'};
myvalue[1] = {["asdas2"]: 'qwerty2'};

you can iterate over myvalue with simple for..in.

edited Jan 26, 2021 at 14:26

answered Jan 26, 2021 at 14:18

Fatih Ersoy

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