A simple web tool that converts an x-www-form-urlencoded string to JSON

Note

Take a look at https://pferreirafabricio.github.io/x-www-form-urlencoded-to-json/ for a live test

The conversion is made in 6 simple steps:

x-wwww-form-urlencoded example: name=Tom&surname=Platz&age=68

1. Blank characters at the start and at the end of the string are removed
2. Split the string into an array by the & character

[
  'name=Tom',
  'surname=Platz',
  'age=68'
]

3. Each string inside the array is split again, now by the = character

[
  ['name', 'Tom'],
  ['surname', 'Platz'],
  ['age', 68]
]

4. Each array inside the array maps the values to the function decodeURIComponent

['name', 'Tom'] -> [decodeURIComponent('name'), decodeURIComponent('Tom')]
['surname', 'Platz'] -> [decodeURIComponent('surname'), decodeURIComponent('Platz')]
['age', '68'] -> [decodeURIComponent('age'), decodeURIComponent('68')]

We need to do this because some values may be encoded, for example: From=%2B12012537162 where %2B, when decoded by decodeURIComponent, will return the + character

5. We take the array of array, now adequately sanitized, and call the Object.fromEntries, to transform the array of arrays into an Object

{
  name: 'Tom',
  surname: 'Platz',
  age: 68
}

6. Finally we call JSON.stringify using the third parameter (space) as 2 to have better visualization of the JSON

{
  "name": "Tom",
  "surname": "Platz",
  "age": "68"
}

The final function will be:

function convertToJson(value) {
  return JSON.stringify(
    Object.fromEntries(
      value
        .trim()
        .split("&")
        .map((s) => s.split("="))
        .map((pair) => pair.map(decodeURIComponent))
    ),
    undefined,
    2
  );
}

• Converts an x-www-form-urlencoded string to JSON
• Provides a user-friendly interface to input the string and view the converted JSON
• Allows users to copy the converted JSON to the clipboard
• Free and online tool

1. Clone this repository git clone https://github.com/pferreirafabricio/x-www-form-urlencoded-to-json.git
2. Enter in the project's folder: cd x-www-form-urlencoded-to-json
3. Open the index.html in your browser

• HTML
• CSS
• JavaScript

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