“javascript”

Strips types from TypeScript to give plain JavaScript.

Beautifies JavaScript code with consistent indentation.

Parses DER, BER and PEM data such as certificates and keys into a readable ASN.1 tree.

Turns a JavaScript object literal into strict JSON.

Infers TypeScript types from a JavaScript object literal.

Compiles TypeScript to JavaScript in the browser.

Basic calculator for everyday arithmetic, built with JavaScript and running in the browser.

Calculator for binary arithmetic and bitwise operations that works on phones and desktops.

Translates simple Python code into JavaScript.

Shows navigator, screen, time zone and other properties scripts can read.

Interactive maps of solar eclipse paths with local circumstances for a place.

Writes JavaScript for Espruino boards and uploads it over Web Bluetooth or Web Serial.

Draws a JavaScript regular expression as a railroad-style diagram to help you read it.

Demo of JavaScript OCR that reads text from images in many languages.

Demo UI of sql.js, SQLite compiled to JavaScript, for running queries on in-memory databases.

Reformats minified or messy JavaScript, HTML and CSS with indentation settings.

Transpile or minify JavaScript and TypeScript with the SWC compiler and adjustable options.

Demos of neural networks trained directly in JavaScript for classification, regression and more.

Builds and tests JavaScript or PCRE regular expressions with live highlighting, contextual help and a searchable community library.

Compiles modern JavaScript with Babel presets and plugins in the browser and shows the output.

Edit ECharts option code and see the chart redraw, with a large gallery of starting examples.

Edit HTML, CSS and JavaScript side by side with live result and shareable links.

Turns pasted JavaScript into a draggable bookmarklet link.

Block and JavaScript editor for micro:bit programs with an on-screen simulator.