Deno Online Compiler / Playground

Write, test, and execute JavaScript and TypeScript with the Deno runtime online using our free Online Deno Compiler / Playground. Run Deno scripts directly in your browser-based environment without installing Deno locally, configuring CLI tools, or setting up a separate TypeScript toolchain.

How to Use This Deno Compiler

  1. Write or paste your Deno code
    Enter JavaScript or TypeScript in the Code Editor. You can test variables, functions, async code, TypeScript types, arrays, objects, and supported Deno runtime APIs.
  2. Click the Run button
    Select Run to execute your script in the pre-configured Deno environment. Edit your code and run it again whenever you want to test another example.
  3. Check the Output terminal
    View program output, errors, and execution results in the Output terminal. Use the available copy, download, and delete controls to manage your results.

Key Features

  • JavaScript & TypeScript Support: Execute supported .js and TypeScript-style code without a separate transpilation setup.
  • Pre-Configured Deno Runtime: Start coding without installing or configuring Deno locally.
  • Zero Installation: No Deno CLI, Node.js, npm, or local IDE setup required for supported examples.
  • Instant Script Execution: Click Run and quickly view the result.
  • Modern JavaScript Support: Practice async/await, promises, modules, objects, arrays, classes, and modern syntax.
  • TypeScript Testing: Experiment with interfaces, type annotations, functions, and other TypeScript features.
  • Deno Runtime APIs: Test supported Deno-specific APIs available in the playground environment.
  • Dark & Light Mode: Switch the Code Editor theme for comfortable programming.
  • Error Feedback: Inspect syntax or runtime errors directly in the Output terminal.
  • Output Controls: Copy, download, or clear results directly from the Output panel.
1. How do I run JavaScript or TypeScript code in this online Deno compiler?

You can enter standard JavaScript directly in the Code Editor:

You can also test modern JavaScript functions:

For TypeScript, add type annotations:

Or use an interface:

Click Run and view the result in the Output terminal.

No. The Online Deno Compiler provides a pre-configured execution environment for supported Deno, JavaScript, and TypeScript examples.

You can immediately run code such as:

You do not need to install the Deno CLI, configure TypeScript, or create a local project for basic testing.

A local Deno installation may still be required for larger applications, filesystem-dependent projects, custom permission settings, production servers, or complex external dependencies.

Yes, it is useful for experimenting with Deno syntax, TypeScript, async logic, and supported runtime APIs.

For example, you can test async code:

You can also inspect basic Deno runtime information when the corresponding API is available:

Another useful example is environment-independent timing:

Some Deno APIs involving filesystem access, environment variables, subprocesses, or external network requests may be limited by the playground’s security sandbox.

Yes. After running your script, use the controls in the Output panel to copy or download the generated result.

For example:

You can also test JSON output:

After execution, use the copy option to copy the terminal result or the download option to save it for later use.

The Online Deno Compiler / Playground is useful for JavaScript and TypeScript developers, backend engineers, and students who want to practice Deno syntax, TypeScript features, async programming, and supported runtime APIs without configuring a local development environment.