URL-Decoder

// urldecode() - decodes form encoding (+ becomes space)
$decoded = urldecode($encoded);

// rawurldecode() - RFC 3986 compliant (+ stays as +)
$decoded = rawurldecode($encoded);

// Parsing query strings (automatic decoding)
$url = 'https://example.com/search?q=coffee+%26+tea';
$parts = parse_url($url);
parse_str($parts['query'], $params);
// $params['q'] is automatically decoded: "coffee & tea"

// decodeURIComponent() - standard decoding (recommended)
const decoded = decodeURIComponent('hello%20world%20%26%20stuff');
// Result: "hello world & stuff"

// Handle plus signs manually if needed
function decodeFormData(str) {
    return decodeURIComponent(str.replace(/\+/g, ' '));
}

// Parsing URL parameters
const url = new URL('https://example.com/search?q=coffee+%26+tea');
const query = url.searchParams.get('q');
// Automatically decoded: "coffee & tea"

from urllib.parse import unquote, unquote_plus, parse_qs

# unquote() - standard decoding (+ stays as +)
decoded = unquote('hello%20world%20%26%20stuff')
# Result: "hello world & stuff"

# unquote_plus() - form decoding (+ becomes space)
decoded = unquote_plus('hello+world+%26+stuff')
# Result: "hello world & stuff"

# Parsing query strings (automatic decoding)
params = parse_qs('q=coffee+%26+tea&page=1')
# params['q'] = ['coffee & tea']

import (
    "net/url"
    "fmt"
)

// QueryUnescape() - decodes query strings (+ becomes space)
decoded, err := url.QueryUnescape("hello+world+%26+stuff")
if err != nil {
    fmt.Println("Decoding error:", err)
}
// Result: "hello world & stuff"

// PathUnescape() - decodes paths (+ stays as +)
decoded, err := url.PathUnescape("hello%2Fworld")
// Result: "hello/world"

// Parsing URL parameters (automatic)
u, _ := url.Parse("https://example.com/search?q=coffee+%26+tea")
query := u.Query().Get("q")
// Automatically decoded: "coffee & tea"

import java.net.URLDecoder;
import java.nio.charset.StandardCharsets;

// URL decoding (always specify UTF-8)
try {
    String decoded = URLDecoder.decode("hello+world+%26+stuff",
                                      StandardCharsets.UTF_8);
    // Result: "hello world & stuff"
} catch (Exception e) {
    System.err.println("Decoding error: " + e.getMessage());
}

require 'uri'
require 'cgi'

# URI.decode_www_form_component() - form decoding
decoded = URI.decode_www_form_component('hello+world+%26+stuff')
# Result: "hello world & stuff"

# CGI.unescape() - alternative
decoded = CGI.unescape('hello+world')
# Result: "hello world"

# Parsing query strings (automatic)
params = URI.decode_www_form('q=coffee+%26+tea&page=1')
# params = [['q', 'coffee & tea'], ['page', '1']]

using System;
using System.Web;
using System.Net;

// HttpUtility.UrlDecode() - form decoding (+ becomes space)
string decoded = HttpUtility.UrlDecode("hello+world+%26+stuff");
// Result: "hello world & stuff"

// Uri.UnescapeDataString() - standard decoding (no System.Web)
string decoded = Uri.UnescapeDataString("hello%20world%20%26%20stuff");
// Result: "hello world & stuff"