How to Convert URL Parameters to a JavaScript Object?

How to Convert URL Parameters to a JavaScript Object?

When working with web applications, it's common to encounter URLs that contain parameters. These parameters can carry additional information that you want to access within your JavaScript code. To do so, you'll need to convert the URL parameters into a JavaScript object.

One-Liner Solution

The following one-liner provides a quick and straightforward way to convert URL parameters to an object:

<code class="javascript">JSON.parse('{&quot;' + decodeURI("abc=foo&amp;def=%5Basf%5D&amp;xyz=5".replace(/&amp;/g, "&quot;,&quot;").replace(/=/g, "&quot;:&quot;")) + '&quot;}')</code>

Step-by-Step Breakdown

Let's break down this solution step by step:

1. Decode URI: This step ensures proper decoding of any escaped characters in the URL parameters. For example, "&" would be decoded to "&".
2. Escape Quotes: Any double quotes in the URL parameters need to be escaped using """. This prevents syntax errors when parsing the JSON object.
3. Replace "&" with "","": The "&" symbols in the URL parameters represent key-value pairs. However, JSON requires these to be separated by ""," (comma inside double quotes).
4. Replace "=" with "":"": The "=" symbols in the URL parameters separate keys and values. To create a valid JSON object, they must be replaced by "":"".
5. Wrap with Curly Braces and Quotes: Finally, the entire string is surrounded by curly braces and double quotes, making it a valid JSON object.

Reviver Function

While the one-liner solution handles most scenarios, it may encounter issues with certain characters like "%" in the URL parameters. To address this, you can use a reviver function when parsing the JSON object:

<code class="javascript">JSON.parse('{&quot;' + search.replace(/&amp;/g, '&quot;,&quot;').replace(/=/g,'&quot;:&quot;') + '&quot;}', function(key, value) { return key===&quot;&quot;?value:decodeURIComponent(value) })</code>

This reviver function performs URI decoding before returning the value for each key, ensuring that all characters are properly handled.

Example Usage

To use either of these solutions, simply replace "abc=foo&def=[asf]&xyz=5" with the actual URL parameters you want to convert. The output will be a JavaScript object that you can access and manipulate as needed.

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