How to encode and decode URL parameters and query strings in Go?

In Go, you can use the url package to encode and decode URL parameters and query strings. Here's an example of how to do it:

Import the url package:

import (
    "net/url"
)

Encoding URL parameters:

func encodeURLParams() {
    params := url.Values{}
    params.Set("key1", "value1")
    params.Set("key2", "value2")

    encodedParams := params.Encode()
    fmt.Println(encodedParams) // Output: "key1=value1&key2=value2"
}

Encoding and adding to the URL:

func encodeQueryParam() {
    baseURL := "https://example.com"
    params := url.Values{}
    params.Set("key1", "value1")
    params.Set("key2", "value2")

    // Encode the parameters
    encodedParams := params.Encode()

    // Append the encoded parameters to the URL
    encodedURL := baseURL + "?" + encodedParams
    fmt.Println(encodedURL) // Output: "https://example.com?key1=value1&key2=value2"
}

Decoding URL parameters:

func decodeURLParams() {
    query := "key1=value1&key2=value2"

    // Parse the query string
    params, err := url.ParseQuery(query)
    if err != nil {
        fmt.Println("Error parsing query:", err)
        return
    }

    // Access the values by key
    value1 := params.Get("key1")
    value2 := params.Get("key2")
    fmt.Println(value1) // Output: "value1"
    fmt.Println(value2) // Output: "value2"
}

Note: Remember to handle errors appropriately while parsing or encoding the URL parameters.