Erlang Online Compiler
Write, compile, and run Erlang code online directly from your browser with our free Online Erlang Compiler. Test Erlang modules, functions, pattern matching, and concurrency concepts without installing Erlang/OTP or configuring a local BEAM development environment.
How to Use This Erlang Compiler
- Write or paste your Erlang code
Enter your program in the Code Editor. You can test modules, functions, pattern matching, recursion, tuples, lists, and other Erlang features supported by the execution environment. - Click the Run button
Select Run to compile and execute your Erlang program. If your code contains a syntax, compilation, or runtime error, review the returned message and correct the relevant code. - Check the Output screen
Your program result appears in the Output panel. Use the available controls to copy, download, or delete the output before running another program.
Key Features
- Free Online Erlang Compiler: Write and execute Erlang programs directly from a modern web browser.
- Zero Installation: No need to install Erlang/OTP or configure a local BEAM environment for supported programs.
- Instant Execution: Click Run and quickly view program output or compiler feedback.
- Standard Erlang Syntax: Practice modules, functions, recursion, pattern matching, guards, lists, tuples, maps, and other core language features.
- Functional Programming Support: Experiment with immutable data and function-oriented programming patterns commonly used in Erlang.
- Concurrency Practice: Test lightweight-process and message-passing concepts when supported by the online execution environment.
- Dark and Light Mode: Switch the Code Editor theme for comfortable programming in different lighting conditions.
- Output Controls: Copy, download, or clear generated output directly from the Output panel.
1. How do I print output in this Erlang compiler using io:format?
Erlang commonly uses io:format/2 to display formatted output.
Enter the code in the Code Editor, click Run, and view the result in the Output screen.
You can also print variable values:
2. Do I need to install Erlang/OTP on my computer?
No. You can use this Online Erlang Compiler directly from your browser without installing Erlang/OTP locally for supported programs.
A local Erlang environment may still be preferable for larger applications, OTP projects, distributed nodes, debugging, dependency management, or programs requiring unrestricted system access.
3. Does this compiler support standard Erlang modules and functions?
The compiler is intended to support standard Erlang language features and commonly available OTP modules in the configured execution environment.
Typical examples may include modules such as lists, maps, string, math, and io. Availability of specialized OTP applications, external libraries, network services, or platform-specific functionality may vary.
4. Can I use Erlang processes and message passing in this compiler?
Erlang provides lightweight processes through spawn and message passing with the ! operator and receive.
Basic concurrency examples may work when supported by the runtime, but long-running processes, networking, distributed Erlang nodes, or system-level operations can be restricted in an online compiler environment.