escape & unescape String functions in JavaScript

escape & unescape string function

We can use escape function in JavaScript to make a string portable to transmit it over a network. All the non ASCII characters are to be converted before sending them by using escape function. The escape function will replace these non ASCII characters to its two or four digit hex format.

The escape function converts a blank space into %20, same way it converts & to %26

After conversion we can get back the original string by using another JavaScript function unscape

Let us start with some examples

First let us create a string variable and then apply escape function and display it.


var str="this is some text &')";

document.write(str);

document.write("<br>");

document.write(escape(str));

The output of the above code will be


this is some text &')

this%20is%20some%20text%20%26%27%29

As you can see the space in between words and other special chars are replaced by their hex values and now they can be transmitted over net.
Now let us try to get back the original string by using unescape function. We will add one more line to the above code.


var str="this is some text &')";

document.write(str);

document.write("<br>");

document.write(escape(str));

document.write("<br>");

document.write(unescape(str));

The output of this is here ( only the last line ).


this is some text &')

We got our original string.

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