# JDoodle

> An online compiler, editor and IDE. Write and run code in 114 languages,
> frameworks and databases in a browser, with nothing to install. Running code
> is free and needs no account. A step debugger, live GUI windows, hosted
> databases and multi-file projects are part of the same editor.

JDoodle executes code on its own servers rather than simulating it: a Java
program is built with javac and run on a real JDK; C and C++ are compiled with
GCC. Every language page is both an editor and a compiler. An account is only
needed to save projects, use more AI credits, or get a faster workspace.

People use it to learn a language, to teach a class, to try a library without
installing a toolchain, and to put a runnable editor in their own docs or
product.

## Start here

- [Run code now](https://www.jdoodle.com/start-coding): choose a language and start writing
- [Every language and version](https://www.jdoodle.com/docs/reference/languages): what each one supports, which take libraries, which run multiple files, which debug, which show a GUI window
- [Pricing](https://www.jdoodle.com/pricing): free to run code; Pro and Teacher add AI credits, faster workspaces, and longer debug sessions and GUI windows

## Languages people ask for most

- [Java](https://www.jdoodle.com/online-java-compiler): JDK 8 through 25, Maven libraries, step debugger on the newest JDK
- [Python](https://www.jdoodle.com/python3-programming-online): Python 3.5 through 3.14, pip packages, step debugger on the newest 3.x
- [C](https://www.jdoodle.com/c-online-compiler): GCC 5.3 through 15.2, step debugger on the newest GCC
- [C++](https://www.jdoodle.com/online-compiler-c++): GCC 5.3 through 15.2, C++14 through C++23, step debugger on the newest GCC
- [C#](https://www.jdoodle.com/compile-c-sharp-online): .NET, NuGet packages
- [PHP](https://www.jdoodle.com/php-online-editor): Composer packages, step debugger
- [Go](https://www.jdoodle.com/execute-go-online): step debugger
- [Rust](https://www.jdoodle.com/execute-rust-online): step debugger
- [TypeScript](https://www.jdoodle.com/online-compiler-typescript): npm packages
- [Kotlin](https://www.jdoodle.com/compile-kotlin-online): Maven libraries, step debugger
- [Swift](https://www.jdoodle.com/execute-swift-online)
- [Ruby](https://www.jdoodle.com/execute-ruby-online): step debugger
- [Node.js](https://www.jdoodle.com/execute-nodejs-online): npm packages, step debugger

## Debugger

Twenty three language and version combinations can be stepped through in the
browser. Set a breakpoint on a line, press Debug, step over or into, and read
local variables and the call stack while the program is paused. Debugging is
free. A session starts at three minutes and extends as you step, to five
minutes on the free plan and fifteen on Pro, Teacher and Student.

This is not a JavaScript simulation of GDB. C and C++ use a native debugger;
Java, Python, Node.js and the rest use the debugger that language actually
has. Fortran and Ada step but do not list variables.

- [The debugger](https://www.jdoodle.com/docs/ide/debugger): breakpoints, stepping, variables, which languages, how long a session lasts
- [Java](https://www.jdoodle.com/online-java-compiler), [C](https://www.jdoodle.com/c-online-compiler) and [C++](https://www.jdoodle.com/online-compiler-c++): the three pages people looking for an online debugger usually want

## GUI windows

Programs that draw rather than print get a real screen, shown live in the
browser while they run - a matplotlib chart, a turtle drawing, a tkinter or
Swing window, an SDL sketch. It is the window itself, not a picture of it, so
it can be clicked and typed into.

Twenty languages can open one on their newest version: C, C++, C++ 14,
C++ 17, C++ 20, C++ 23, C99, Clojure, FreeBASIC, Groovy, Java, Kotlin, Perl,
PyPy3, Python 3, R, Rhino JS, Ruby, Scala and Tcl. Eight take their toolkit
from the Libraries box first: the C dialects use X11, the C++ dialects use
SDL2, and Ruby uses tk.

Off by default and ticked per run, since a program that only prints needs no
screen. A window opens for three minutes and extends every time it is used, to
five minutes on the free plan and fifteen on a paid one.

- [The GUI window](https://www.jdoodle.com/docs/ide/gui-window): turning it on, which languages, how long a window lasts, using it while debugging

## Databases and frameworks

Nine languages run as an environment rather than a single-file compile: a
terminal, a browser preview, and a filesystem that persists until you reset it.
Databases get a query terminal instead of a shell.

- [PostgreSQL](https://www.jdoodle.com/psql): hosted Postgres, write SQL in the browser
- [MySQL](https://www.jdoodle.com/mysql): hosted MySQL, same idea
- [MongoDB](https://www.jdoodle.com/mongodb): hosted MongoDB, query in the browser
- [React](https://www.jdoodle.com/reactjs), [Vue](https://www.jdoodle.com/vuejs), [Express](https://www.jdoodle.com/expressjs), [Flask](https://www.jdoodle.com/flask), [Spring Boot](https://www.jdoodle.com/spring), [Laravel](https://www.jdoodle.com/laravel)
- [Frameworks and databases](https://www.jdoodle.com/docs/ide/environments): what an environment is, how reset works
- [Work with a database](https://www.jdoodle.com/docs/for-coders/databases): PostgreSQL, MySQL and MongoDB in plain words

## Using JDoodle

- [The IDE](https://www.jdoodle.com/docs/ide): input, interactive runs, files, sharing. The same on every language
- [Multi-file projects](https://www.jdoodle.com/docs/ide/multi-file-projects): which languages support them and how
- [Libraries](https://www.jdoodle.com/docs/ide/libraries): Maven, pip, npm, NuGet, Composer — the identifier the ecosystem already uses
- [Live coding](https://www.jdoodle.com/docs/ide/live-coding): two people in the same project, live cursors
- [JDoodle AI](https://www.jdoodle.com/docs/ai): asking about the code on the page, generating it, explaining it
- [Account and plans](https://www.jdoodle.com/docs/account)

## Building on JDoodle

- [Compiler API](https://www.jdoodle.com/compiler-api): run code from your own product
- [API docs](https://www.jdoodle.com/docs/api): REST and WebSocket
- [Language codes and version indexes](https://www.jdoodle.com/docs/api/languages): the values the API accepts
- [Embed an IDE](https://www.jdoodle.com/integrate-online-ide-compiler-api-plugins): put a runnable editor in your own page
- [Embed docs](https://www.jdoodle.com/docs/embeds)
- [Teach and assess](https://www.jdoodle.com/online-assessment-teaching): class accounts, assignments, automated grading
- [Assessments docs](https://www.jdoodle.com/docs/assessments)

## Learning

- [Tutorials](https://www.jdoodle.com/tutorials): courses by language, from first program to advanced topics
- [Java tutorials](https://www.jdoodle.com/tutorials/java)
- [Python tutorials](https://www.jdoodle.com/tutorials/python)
- [C tutorials](https://www.jdoodle.com/tutorials/c)
- [C++ tutorials](https://www.jdoodle.com/tutorials/cpp)

## Who it is for

- [Students](https://www.jdoodle.com/docs/for-students): write, run, sit an assessment, keep the work
- [Teachers](https://www.jdoodle.com/docs/for-teachers): groups, shared projects, assessments, grading
- [Builders](https://www.jdoodle.com/docs/for-builders): API or embed, when to use which
- [Writers](https://www.jdoodle.com/docs/for-writers): a runnable sample in an article or docs page

## Common questions

- **Do I need to install anything, or create an account, to run code?** No. Open a language page and press Execute. An account is only needed to save work, use more AI credits, or unlock a faster workspace.
- **Is the code simulated in the browser?** No. It runs on JDoodle's servers. Java is compiled with javac on a real JDK.
- **Can I debug online?** Yes, on 23 language and version combinations, including Java, Python 3, C, C++, Go, Rust, Kotlin, PHP, Ruby and Node.js. Click a line number, press Debug, step, and read locals. Free to use.
- **Can I run SQL or MongoDB in the browser?** Yes. PostgreSQL, MySQL and MongoDB are hosted environments with a query terminal. No install and no account to run a query.
- **Can I add Maven, pip or npm libraries?** Yes, on the languages that support them. Use the coordinate that ecosystem already uses.
- **Can I put a compiler on my own site?** Yes. An embed for a page, and a Compiler API for a backend.

## About

JDoodle has run an online compiler since 2013. It is built by JDoodle Labs Pty
Ltd in Australia.

- [What JDoodle is](https://www.jdoodle.com/about-us)
- [Contact](https://www.jdoodle.com/contact-us)

## Optional

- [Blog](https://www.jdoodle.com/blog)
- [Mobile app](https://www.jdoodle.com/docs/mobile-app)
- [Chrome extension](https://www.jdoodle.com/docs/browser-extension): select code on any page and run it