A step-by-step guide on reading/loading a JSON file using Typescript

Question

A step-by-step guide on reading/loading a JSON file using Typescript

I'm fairly new to Typescript and I'm attempting to parse a simple JSON file using Typescript. After searching online and testing different solutions, I still haven't been able to find a straightforward code snippet that reads a local JSON file into a numeric array variable. The content of the JSON file is as follows: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 16.4, 194.1, 95.6, 54.4].

If anyone could provide me with some guidance on this issue, I would greatly appreciate it.

Best regards, GF

json typescript

Answer 1

Answer №1

Start by creating a JSON file in a designated folder, such as properties.json.

{ 
"url" : "https://github.com/microsoft/TypeScript/blob/main/package.json?msclkid=3b7f06f5d0e111eca3cc1f08a914ff77",
person: {
   "firstname":"yuvraj",
   "lastname" : "thorat"
}
}

Next, to read the JSON file, you need to create a file within your project folder called readjson.ds.ts

declare module "*.json" {
   const value : any;
   export default value
}

Now you can access this JSON data within your project from a different file.

To do so, add an import statement like the one below and reference the desired JSON properties.

---------------------------------------------------
import * as prop from "../testdata/properties.json"

siteUrl =  (<any>prop).url;
----------------------------------------------------

That's it! You should now be able to access all remaining properties in a similar manner.

Answer 2

Start by creating a JSON file in a designated folder, such as properties.json.

{ 
"url" : "https://github.com/microsoft/TypeScript/blob/main/package.json?msclkid=3b7f06f5d0e111eca3cc1f08a914ff77",
person: {
   "firstname":"yuvraj",
   "lastname" : "thorat"
}
}

Next, to read the JSON file, you need to create a file within your project folder called readjson.ds.ts

declare module "*.json" {
   const value : any;
   export default value
}

Now you can access this JSON data within your project from a different file.

To do so, add an import statement like the one below and reference the desired JSON properties.

---------------------------------------------------
import * as prop from "../testdata/properties.json"

siteUrl =  (<any>prop).url;
----------------------------------------------------

That's it! You should now be able to access all remaining properties in a similar manner.

Answer 3

Answer №2

Using Standard JavaScript -

let jsonData = "[29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 16.4, 194.1, 95.6, 54.4]";
let arrayData = JSON.parse(jsonData);

(edit)

I recently came across the requirement for a "local file" incorporation. If you need to do this at compile time, simply prefix the JSON data in the file with the variable name and nothing else is required - just a basic window.json = ... will suffice - no quotes needed. For runtime inclusion, the file needs to be loaded either through AJAX or by adding the variable-prefixed file within a

<script type="text/javascript" src="file.json"></script>

tag.

Answer 4

Using Standard JavaScript -

let jsonData = "[29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 16.4, 194.1, 95.6, 54.4]";
let arrayData = JSON.parse(jsonData);

(edit)

I recently came across the requirement for a "local file" incorporation. If you need to do this at compile time, simply prefix the JSON data in the file with the variable name and nothing else is required - just a basic window.json = ... will suffice - no quotes needed. For runtime inclusion, the file needs to be loaded either through AJAX or by adding the variable-prefixed file within a

<script type="text/javascript" src="file.json"></script>

tag.

A step-by-step guide on reading/loading a JSON file using Typescript

Answer №1

Start by creating a JSON file in a designated folder, such as properties.json.

Next, to read the JSON file, you need to create a file within your project folder called readjson.ds.ts

Answer №2

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