How to read data from a text file into a collection? (JSON preferred)

I need to read several lists of 2D coordinates into a data collection, like a Dictionary for example, from a text file.
I can make the file into any format (it´s originally an SVG but I made an ETL that cleans it and can spit JSON or whatever other format) but JSON is preferred.
Thanks!

Well, I do it using FileStream. I first save the length of the array and then do a for loop to save the data.

Here is an example of saving an array on integers in C#

`

using System.IO;

public class SomeClass
{
	FileStream file;
	
	public void SaveArray(int[] arr)
	{
		file = File.open("myfile.format", FileMode.OpenOrCreate);
		
		byte[] arraySize = System.BitConverter.GetBytes(arr.Length);
		file.Write(arraySize, 0, sizeof(int));
		
		for(int i = 0; i < arr.Length; i++)
		{
			byte[] arrayElement = System.BitConverter.GetBytes(arr*);*
  •   		file.Write(arrayElement, 0, sizeof(int));*
    
  •   	}*
    
  •   	file.Close();*
    
  •   }*
    
  •   public void LoadArray(int[] arr)*
    
  •   {*
    
  •   	if (file = File.Open("myfile.format", FileMode.Open))*
    
  •   	{*
    
  •   		byte[] arraySize = new byte[sizeof(int)];*
    
  •   		file.Read(arraySize, 0, sizeof(int));*
    
  •   		arr = new int[arraySize];*
    
  •   		for (int i = 0; i < arraySize; i++)*
    
  •   		{*
    
  •   			byte[] arrayElement = new byte[sizeof(int)];*
    
  •   			file.Read(arrayElement, 0, sizeof(int));*
    

_ arr = System.BitConverter.ToInt32(arrayElement);_
* }*

* file.Close();*
* }*
* }*
* }*
*_ _*You need to remember, when saving, things come out in the exact same way they go in.*_ _*So since you are doing an array of 2D coordinates. That means in the loop, you would do 2 writes and 2 reads instead of one. One for each float in the coordinate.*_ _*
for(int i = 0; i < arr.Length; i++)
{
byte[] arrayElement = System.BitConverter.GetBytes(arr*.x);*
file.Write(arrayElement, 0, sizeof(int));
arrayElement = System.BitConverter.GetBytes(arr*.y);*
file.Write(arrayElement, 0, sizeof(int));
}
`
The same principles should apply with whatever format you choose to use. You just need to find out how the co-ordinates are stored in the file so you know what datatypes to pull out the data as.