Javascript get all request parameters

How to get «get» request parameters in javascript?

When working with JavaScript and making HTTP requests, it’s often necessary to retrieve «GET» request parameters, which are key-value pairs appended to the end of a URL. For example, in the URL «www.example.com?key1=value1&key2=value2\», the two parameters are «key1=value1» and «key2=value2».

Method 1: Using the URL API

To get «GET» request parameters in JavaScript using the URL API, you can follow these steps:

1. Get the current URL using window.location.href .
2. Create a new URL object using the current URL: const url = new URL(window.location.href);
3. Get the search parameters from the URL using url.searchParams .
4. Use the get() method of searchParams to get the value of a specific parameter.

Here’s an example code snippet that demonstrates how to get the value of a «name» parameter from the URL:

const url = new URL(window.location.href); const name = url.searchParams.get("name"); console.log(name); // Output: the value of the "name" parameter

You can also use the getAll() method of searchParams to get all values of a parameter:

const url = new URL(window.location.href); const values = url.searchParams.getAll("name"); console.log(values); // Output: an array of all values of the "name" parameter

If you want to check if a parameter exists in the URL, you can use the has() method of searchParams :

const url = new URL(window.location.href); if (url.searchParams.has("name"))  // Do something if the "name" parameter exists >

You can also add new parameters to the URL using the append() method of searchParams :

const url = new URL(window.location.href); url.searchParams.append("newParam", "value"); console.log(url.href); // Output: the URL with the new "newParam" parameter added

And finally, you can remove parameters from the URL using the delete() method of searchParams :

const url = new URL(window.location.href); url.searchParams.delete("name"); console.log(url.href); // Output: the URL with the "name" parameter removed

That’s it! Using the URL API is a simple and efficient way to get «GET» request parameters in JavaScript.

Method 2: Using the Location object

To get «GET» request parameters in JavaScript using the Location object, you can use the following steps:

1. Get the current URL using window.location.href .
2. Parse the URL using the URLSearchParams() constructor.
3. Use the get() method to get the value of a specific parameter.

Here is an example code snippet:

const params = new URLSearchParams(window.location.search); const paramValue = params.get('paramName'); console.log(paramValue);

In the above code, params is an instance of URLSearchParams that contains all the query parameters in the URL. paramValue is the value of the paramName parameter.

You can also get all the parameters in the URL by using the entries() method:

for (const [key, value] of params.entries())  console.log(`$key>: $value>`); >

This will log all the parameters and their values in the console.

Another way to get the parameters is by accessing the search property of the Location object:

const paramsString = window.location.search; const searchParams = new URLSearchParams(paramsString); const paramValue = searchParams.get('paramName'); console.log(paramValue);

This code does the same thing as the previous example, but it uses the search property instead of window.location.href .

In summary, to get «GET» request parameters in JavaScript using the Location object, you can use the URLSearchParams() constructor to parse the URL and get the parameters. You can then use the get() method to get the value of a specific parameter or the entries() method to get all the parameters and their values.

Method 3: Using Regular Expressions

To extract GET request parameters in JavaScript using regular expressions, you can use the window.location.search property to get the query string from the current URL. Then, you can use regular expressions to extract the parameters from the query string.

Here is an example code snippet:

const queryString = window.location.search; const urlParams = new URLSearchParams(queryString); const regex = /[?&]([^=#]+)=([^&#]*)/g; let match; while ((match = regex.exec(queryString)))  const key = decodeURIComponent(match[1].replace(/\+/g, " ")); const value = decodeURIComponent(match[2].replace(/\+/g, " ")); urlParams.append(key, value); > console.log(urlParams.get("param1")); // Output: "value1" console.log(urlParams.get("param2")); // Output: "value2"

In this code, we first get the query string from the current URL using the window.location.search property. Then, we create a new URLSearchParams object to parse the query string.

Next, we define a regular expression to match the parameter key-value pairs in the query string. The regular expression matches any characters after a ? or & until it reaches an = or # , and then matches any characters after the = until it reaches an & or # .

We then loop through all the matches using the exec method and extract the key and value from each match. We use decodeURIComponent to decode any URL-encoded characters in the key and value, and replace any + characters with spaces.

Finally, we append each key-value pair to the URLSearchParams object. We can then use the get method to retrieve the value of a specific parameter.

Note that this method only works for GET requests and may not be suitable for all use cases.

Источник

How to get URL parameters in javascript

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A URL consists of a root and some parameters that carry some data. These parameters are in the key-value pairs and separated by ‘&’ character. Also, the list of parameters and the actual URL are separated by a ‘?’ character.
This list of parameters is called URL parameters or query parameters while the complete string after the ‘?’ character is called query string.

actual or root URL: https://www.google.com
query parameters: enc=en, auth_user=u and lan=fr
query string: ?enc=en&auth_user=u&lan=fr

1. Create an empty object that will hold the query parameters.
2. Retrieve the query string using window.location.search.
3. Remove the starting ‘?’ by using substr function.
4. Split the remaining string over ‘&’ character.
5. Loop over the resulting array. Each array item will be a query parameter in key-value pair separated by ‘=’.
6. Split the query parameter over ‘=’ and add first item as a key and second item as a value to the object initialized in Step 1.

// initialize an empty object let result = {}; // get URL query string let params = window.location.search; // remove the '?' character params = params.substr(1); // split the query parameters let queryParamArray = params.split('&'); // iterate over parameter array queryParamArray.forEach(function(queryParam) { // split the query parameter over '=' let item = queryParam.split('='); result[item[0]] = decodeURIComponent(item[1]); }); // print result object console.log(result);

// initialize an empty object let result = <>; // get URL query string let params = window.location.search; // remove the ‘?’ character params = params.substr(1); // split the query parameters let queryParamArray = params.split(‘&’); // iterate over parameter array queryParamArray.forEach(function(queryParam) < // split the query parameter over '=' let item = queryParam.split('='); result[item[0]] = decodeURIComponent(item[1]); >); // print result object console.log(result);

Above code when executed with a URL https://www.google.com?enc=en&auth_user=u&lan=fr prints the following output

You can use the above code as a function as given below

function getQueryParams() { // initialize an empty object let result = {}; // get URL query string let params = window.location.search; // remove the '?' character params = params.substr(1); let queryParamArray = params.split('&'); // iterate over parameter array queryParamArray.forEach(function(queryParam) { // split the query parameter over '=' let item = queryParam.split("="); result[item[0]] = decodeURIComponent(item[1]); }); // return result object return result; }

function getQueryParams() < // initialize an empty object let result = <>; // get URL query string let params = window.location.search; // remove the ‘?’ character params = params.substr(1); let queryParamArray = params.split(‘&’); // iterate over parameter array queryParamArray.forEach(function(queryParam) < // split the query parameter over '=' let item = queryParam.split("="); result[item[0]] = decodeURIComponent(item[1]); >); // return result object return result; >

Now you can easily call this function and get url parameter value by name as shown below

let parms = getQueryParams(); params('auth_user');

let parms = getQueryParams(); params(‘auth_user’);

Note that decodeURIComponent function is only required when the value of a query parameter is a URL or has characters such as : , / , [ etc.

Method 2
This method uses regular expression to create an object of key-value pairs of query parameters.

var result = {}; window.location.search .replace(/[?&]+([^=&]+)=([^&]*)/gi, function(str, key, value) { result[key] = value; } ); console.log(result);

var result = <>; window.location.search .replace(/[?&]+([^=&]+)=([^&]*)/gi, function(str, key, value) < resultJavascript get all request parameters = value; >); console.log(result);

where replace method is invoked on the query string.
It takes 2 arguments. First argument is the regular expression which matches ? and & characters in the query string.
Second argument is the callback function which is invoked every time the pattern given in the regular expression is matched in the source string.
Thus, the callback function receives a query parameter every time it is invoked and it adds the key-value pair to an object.
Method 3
Use the URLSearchParams constructor and supply the query string as an argument to it. It will return an object of key-value pairs corresponding to the URL query parameters. Example,

const queryString = window.location.search; const urlParams = new URLSearchParams(queryString); // get the required parameter const param = urlParams.get('lan'); // returns the value of parameter 'lan'

const queryString = window.location.search; const urlParams = new URLSearchParams(queryString); // get the required parameter const param = urlParams.get(‘lan’); // returns the value of parameter ‘lan’

URLSearchParams is not supported by InternetExplorer and supported by the following browser versions

Firefox: 29 and above
Chrome: 49 and above
Edge: 17 and above
Opera: 36 and above
Safari: 10.3 and above

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