And unescape in javascript

What is difference between unescape() and escape() functions in JavaScript?

JavaScript provides two functions for dealing with encoded strings: escape() and unescape(). The escape() function is used to encode a string, making it safe for use in a URL. The unescape() function is used to decode an encoded string.

The differences

The main difference between the two functions is that escape() encodes characters that are not ASCII, while unescape() only decodes those characters. This means that if you use escape() on a string that only contains ASCII characters, the result will be the same as the input string. However, if you use unescape() on a string that contains non-ASCII characters, the result may be different from the input string.

Use cases

The escape() function is typically used when encoding a URL parameter or path segment. For example, if you wanted to encode the string «Hello world!» for use in a URL, you would use the escape() function, like this −

var encodedString = escape("Hello world!");

The unescape() function is typically used when decoding a URL parameter or path segment. For example, if you wanted to decode the string «Hello%20world!» (which is the encoded version of «Hello world!»), you would use the unescape() function, like this −

var decodedString = unescape("Hello%20world!");

Example

Below is the full working code example −

   var encodedString = escape("Hello world!"); var decodedString = unescape(encodedString); document.getElementById("result1").innerHTML = "Encoded String: " + encodedString document.getElementById("result2").innerHTML = "Decoded String: " + decodedString  

Benefits

Below are the benefits of using the escape() and unescape() functions −

• The escape() function can be used to encode a string for use in a URL.
• The unescape() function can be used to decode an encoded string.
• These functions can be used to ensure that a string is safe for use in a URL.
• These functions can be used to decode a string that has been encoded for use in a URL.

Disadvantages

Below are some of the disadvantages of using the escape() and unescape() functions −

• The escape() function is not supported in all browsers (including Internet Explorer 7 and earlier).
• The unescape() function can be used to decode malicious strings, which can lead to security vulnerabilities.
• The escape() and unescape() functions only work with ASCII characters. If you need to encode/decode a string that contains non-ASCII characters, you should use a different encoding/decoding scheme, such as UTF-8.

Conclusion

In conclusion, the escape() and unescape() functions are used to encode and decode strings, respectively. The main difference between the two functions is that escape() encodes characters that are not ASCII, while unescape() only decodes those characters. These functions can be used to ensure that a string is safe for use in a URL. However, these functions should not be used to decode strings that have been encoded with a different encoding scheme, such as UTF-8.

Note − The escape() and unescape() functions are deprecated. Use encodeURI or encodeURIComponent() and Use decodeURI() or decodeURIComponent() instead.

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unescape()

Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

Note: unescape() is a non-standard function implemented by browsers and was only standardized for cross-engine compatibility. It is not required to be implemented by all JavaScript engines and may not work everywhere. Use decodeURIComponent() or decodeURI() if possible.

The unescape() function computes a new string in which hexadecimal escape sequences are replaced with the characters that they represent. The escape sequences might be introduced by a function like escape() .

Syntax

Parameters

Return value

A new string in which certain characters have been unescaped.

Description

unescape() is a function property of the global object.

The unescape() function replaces any escape sequence with the character that it represents. Specifically, it replaces any escape sequence of the form %XX or %uXXXX (where X represents one hexadecimal digit) with the character that has the hexadecimal value XX / XXXX . If the escape sequence is not a valid escape sequence (for example, if % is followed by one or no hex digit), it is left as-is.

Note: This function was used mostly for URL encoding and is partly based on the escape format in RFC 1738. The unescape() function does not evaluate escape sequences in string literals. You can replace \xXX with %XX and \uXXXX with %uXXXX to get a string that can be handled by unescape() .

Examples

Using unescape()

unescape("abc123"); // "abc123" unescape("%E4%F6%FC"); // "äöü" unescape("%u0107"); // "ć" 

Specifications

Browser compatibility

BCD tables only load in the browser

See also

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What are escape and unescape String Functions in JavaScript

In JavaScript, escape() and unescape() methods are used to encode and decode strings. The JavaScript method unescape() can be used to restore the original string after using the escape() function to make a string accessible for transmission over a network.

This article will describe the escape and unescape functions in JavaScript.

What are escape String Functions in JavaScript?

The “escape()” function encodes the string to make it accessible for network transmission. It encodes all the non-ASCII characters to their two or four-digit hexadecimal numbers. Moreover, a blank space is converted to “%20” by the escape function.

Follow the given syntax to use the escape() method:

Here, “string” is the parameter passed in a method for encoding.

Example

First, create a string named “str”:

Print the string on the page using the “document.write()” method:

Call the escape() method by passing a string as an argument and store the resultant encoded string in a variable “encodeStr”:

Finally, print the encoded string on the page:

The output shows the original and encoded strings. Here, you can see that the “spaces” converted to “%20”, “(“ to “%28”, “!” to “%21” and “)” to “%29”:

What are unescape String Functions in JavaScript?

The unescape() method decodes the string in its original state. It converts all the hexadecimal values to the relevant character that they represent. Some browsers do not support this method, so for that, you can utilize the “ decodeURIComponent()” or “decodeURI()” as a replacement.

Use the below-mentioned syntax for decoding the encoded string using unescape() method:

It takes an encoded string as a parameter.

Here, call the unescape() method by passing an encoded string “encodeStr” as an argument:

Print the decoded string on the page:

The output displays original, encoded, and decoded strings:

That’s all about escape and unescape functions in JavaScript.

Conclusion

The escape and unescape functions are used for encoding and decoding the strings to make a string accessible for transmission over a network. The escape() method converts all the non-ASCII values to their hexadecimal numbers, and the unescape() method will convert the encoded string into its original string by converting hexadecimal values to their non-ASCII characters. In this article, we described the escape and unescape functions in JavaScript.

About the author

Farah Batool

I completed my master’s degree in computer science. I am an academic researcher and love to learn and write about new technologies. I am passionate about writing and sharing my experience with the world.

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What does Unescape do in JavaScript?

The unescape() function computes a new string in which hexadecimal escape sequences are replaced with the character that it represents. The escape sequences might be introduced by a function like escape . Usually, decodeURI or decodeURIComponent are preferred over unescape .

How do you unescape in JavaScript?

JavaScript unescape() The unescape() function is deprecated. Use decodeURI() or decodeURIComponent() instead.

How do you unescape in HTML?

We can escape the HTML of the string using the replace method of the string.

How can I use Htmldecode in JavaScript?

If you need to decode all HTML entities then you can do it without jQuery: var elem = document. createElement(‘textarea’); elem. innerHTML = encoded; var decoded = elem.

What is unescape () and escape () functions?

The unescape() function is used to decode that string encoded by the escape() function. The escape() function in JavaScript is used for encoding a string.

How do you unescape a string?

You can use String unescapeJava(String) method of StringEscapeUtils from Apache Commons Lang. The utility class has methods to escapes and unescape strings for Java, Java Script, HTML, XML, and SQL. It also has overloads that writes directly to a java.

What is HTML Unescape?

The html. html. unescape() replaces the entity names or entity numbers of the reserved HTML characters with its original character representation. For example, the string will be decoded to .

What is escape and unescape in JavaScript?

The escape() and unescape() functions is to Encode and decode a string in JavaScript. The escape() function in JavaScript to make a string portable to transmit it over a network and we can use unscape() function to get back the original string.

What is unescape function?

The unescape function is used in JavaScript to decode a string encoded using the encode function, or to decode other types of encoded strings, such as URLs. Instead, we recommend using the encodeURI or decodeURI functions.

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