“Java”

Generates Java classes from a JSON sample.

Compiles and runs Java snippets online.

Generates Java classes from a GraphQL schema.

Translates Kotlin source into Java.

Turns Java package names into a visual folder tree.

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

Tests one regular expression against many engines such as Java, Go, .NET and PCRE.

Formats Java, Python, JavaScript and Go stack traces with automatic language detection.

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

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

Turns a curl command into equivalent request code in many programming languages.

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

Strips types from TypeScript to give plain JavaScript.

Runs code step by step and draws the variables and memory at each line, for several languages.

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

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

Beautifies JavaScript code with consistent indentation.

Turns a JavaScript object literal into strict JSON.

Live-coding environment for networked video synth visuals written in JavaScript.

Infers TypeScript types from a JavaScript object literal.

Compiles TypeScript to JavaScript in the browser.

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.