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Deno is a runtime environment for JavaScript and TypeScript. Since it’s built to improve upon the earlier version of Node.js, Deno offers significant upgrades to improve security and real-world performance while offering developers modern instrumentation.

In this course, you’ll discover Deno’s main features and explore its similarities and differences in relation with Node.js. You’ll then be led through a series of detailed project examples and practical code exercises to master its runtime.

By the end of the course, you’ll be ready to create professional, highly performant JavaScript or TypeScript applications with Deno.

Master the Deno JavaScript Runtime

# Postman
Postman is an API platform for building and testing APIs. 

IIt’s available for free, and we can find the download link in the  [Appendix: Further Resources](https://www.educative.io/courses/master-deno-javascript-runtime/appendix-further-resources) lesson. After we install Postman on our machine, we can start using the tool directly. As we can see below, the interface is pretty straightforward to use.


We can define which type of request we want to create (GET, PUT, POST, DELETE), provide a target URL, and then use the different tabs to enter specific information, like a custom header or the body payload.

For example, when testing our PUT endpoint, we can define a JSON payload in the body section, and Postman will automatically adapt the content type in the header. We need to be sure to provide the correct URL, as given by the Educative widget with our unique ID.

If the PUT request is successful, we’ll receive a 201 response code, as shown below:

Here we’ll analyze two tools to test the Deno REST APIs we created before.


Appendix: Test your Deno API

Here we’ll analyze two tools to test the Deno REST APIs we created before.