RunKit + 
Try any Node.js package right in your browser
This is a playground to test code. It runs a full Node.js environment and already has all of npm’s 1,000,000+ packages pre-installed, including echo-proxy. Try it out:
require('echo-proxy');
require('@runkit/mrjacobbloom/echo-output-value-viewer/latest')();
// Edit the following code and click Run.
// If everything works correctly, it should print the code you entered!
Echo[234].foo(null, new Echo, [true]).bar[''][Symbol('qux')]
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require()any package directly from npm- use arrow functions, classes, template strings, and most of ES6
awaitany promise instead of using callbacks (example)- create your own embedded node.js snippets
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