json-unflattening

A Rust library for flattening and unflattening JSON structures. Uses serde_json for JSON serialization and deserialization.

Features

• Flatten JSON: Convert nested JSON structures into a flattened form.
• Unflatten JSON: Convert flattened JSON structures back to nested form.

Installation

Add this library to your Cargo.toml:

[dependencies]
json-unflattening = "0.1.4"

Usage

use json_unflattening::{flatten, unflatten};

fn main() {
    let input_json = json!({
        "name": {
            "first": "John",
            "last": "Doe"
        },
        "age": 30,
        "city": "New York",
        "hobbies": ["Reading", "Hiking", "Gaming"]
    });

    let flattened_json = flatten(&input_json).unwrap();
    println!("Flattened JSON: {:#}", serde_json::to_string_pretty(&flattened_json).unwrap());

    let unflattened_json = unflatten(&flattened_json).unwrap();
    println!("Unflattened JSON: {:#}", unflattened_json);
}

Example

Original JSON

{
  "name": {
      "first": "John",
      "last": "Doe"
  },
  "age": 30,
  "city": "New York",
  "hobbies": ["Reading", "Hiking", "Gaming"]
}

Flattened JSON

{
  "name.first": "John",
  "name.last": "Doe",
  "age": 30,
  "city": "New York",
  "hobbies[0]": "Reading",
  "hobbies[1]": "Hiking",
  "hobbies[2]": "Gaming"
}

Flattening process:

1. Flatten Object Properties:

   • Flatten the "name" object properties using dot notation: "name.first" and "name.last".
   • Flatten the scalar properties "age" and "city" directly without modification.

   Result:

   {
     "name.first": "John",
     "name.last": "Doe",
     "age": 30,
     "city": "New York"
   }

2. Flatten Array Elements:

   • Flatten the array "hobbies" by appending indices to each element: "hobbies[0]", "hobbies[1]", and "hobbies[2]".

   Result:

   {
     "name.first": "John",
     "name.last": "Doe",
     "age": 30,
     "city": "New York",
     "hobbies[0]": "Reading",
     "hobbies[1]": "Hiking",
     "hobbies[2]": "Gaming"
   }