JSON key mappings to Object in Typescript

Question

I am trying to map a large/complex/valid JSON string - I only need a set of nested keys as a string array, the rest can be ignored.

I am doing this in Typescript and would like to parse to a JSON Object such as

export interface OpenApi {
  paths:      string[];
}

Here is the [relevant part] json:

{
  "openapi": "3.0.1",
  "info": {
    "title": "title",
    "version": "2018-05-10"
  },
  "paths": {
    "/api/path1": {"ignore" ...},
    "/api/path2": {"ignore" ...},
    "/api/path3": {"ignore" ...}
  }
  ...
}

to map to the above object array of strings

OpenApi.paths = ["/api/path1", "/api/path2", "/api/path3"]

the rest of the json aside from the keys can be ignored.

Any help appreciated! Thank you

You described needing "parsing"; is the JSON a string, or did you already apply JSON.parse to it? Do you simply want to cast the result to your OpenApi interface, or do you actively want to validate the JSON to ensure it conforms to your expected interface? — Jeff Bowman
– Jeff Bowman, Commented Nov 7, 2022 at 17:57
Hi Jeff. I haven't applied JSON.parse yet. It's a large/complex/valid JSON string and I only need those /api paths as a string array. Just trying to figure out how to best resolve down to that nested 'paths' object... If there's a better way to solve it in Typescript that's cool. — Andrew Eells
– Andrew Eells, Commented Nov 7, 2022 at 19:17

Andrew Eells · Accepted Answer · 2022-11-08 06:09:10Z

0

So I ignored resolving to an object in the end, as:

Object.entries(jsonObj.paths).forEach(([key]) => {
    console.info(key);
});

Prints

'/api/path1'
'/api/path2'
'/api/path3'

answered Nov 8, 2022 at 6:09

Andrew Eells

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