How to encode and decode a URI in dart

The URI Uniform Resource Identifier can only be sent over the internet using the ASCII character set, but the URI often contains characters outside the ASCII character set. We need to encode the URI characters so that they can be transmitted over the internet. In this Answer, we'll learn to encode and decode a URI in Dart language.

We'll use the method encodeComponent to encode the URI and decodeComponent to decode the URI provided by the class Uri.

Syntax

// syntax to encode uri

Uri.encodeComponent(provide your uri here)



//syntax to decode uri

Uri.decodeComponent(provide your encoded uri here to decode)

Code example

Let's go through an example below:

void main(){
    //given uri
    var uri = 'https://testurl.com/api?message=Hello World !!!';
    //encode uri
    var encodedUri = Uri.encodeComponent(uri);
    print(" ----- URI after Encoding ----- ");
    print(encodedUri);
    //decode uri
    var decodedUri = Uri.decodeComponent(encodedUri);
    print(" ----- URI after Decoding ----- ");
    print(decodedUri);
}

Code explanation

In the code snippet above:

  • Line 4: We declare and assign a variable uri with a test URI as a value.

  • Line 7: We encode the URI using the encodeComponent() method and assign it to variable encodedUri.

  • Line 10: We display the encoded URI.

  • Line 13: We decode the encoded URI in line 7 using the decodeComponent() method and assign it to the variable decodedUri.

  • Line 16: We display the decode URI.

Free AI Mock Interviews
Coding Interview
Coding PatternsFree Interview
Gain insights and practical experience with coding patterns through targeted MCQs and coding problems, designed to match and challenge your expertise level.
System Design
You TubeFree Interview
Learn to design a video streaming platform like YouTube by tackling functional and non-functional requirements, core components, and high-level to detailed design challenges.

Free Resources

Copyright ©2025 Educative, Inc. All rights reserved