Languages you can run in the browser, part 1: Python, JavaScript, SQLite

People often write about languages that compile to JavaScript. But what if you want to run languages in the browser? Without any API to proxy code and I/O to a standard language implementation on a server? Languages that compile to JavaScript cannot be run in the browser unless the compiler is written in JavaScript.

Recently I was trying to find such languages implemented in JavaScript as possible scripting options for the in-browser DataStation application. In this series I'll walk through a few useful and interesting languages running entirely within the browser, based on learnings building DataStation.

Brython is a Python implementation written in JavaScript. To run a Python script in the browser using Brython, just add the following JavaScript files:

The Brython docs assume you are going to script your app in Python so they only document how to use Brython as the type of a script tag. But if you're trying to run Python code given by the user you can call window.__BRYTHON__.python_to_js(program) and then eval the result. Here's some React pseudo-code:

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