CodeCompiler APIs

Bring code execution and the CodeCompiler editor into your own product. The execution API runs on JDoodle under the hood and covers the same 53+ programming languages available on the site — no separate account needed to try it.

Start building

Code Execution APIExecute code in 53+ programming languages via a single POST request.Embed EditorDrop a full, working code editor into your site as an iframe.

Building something we don't cover yet — challenges, org accounts, SSO? These APIs are new and growing; reach out via the contact options on our pricing page and we'll see what we can add.

Code Execution API

Send code and stdin from your backend, get back stdout, stderr and timing — no browser required. This is the same endpoint the online editor calls.

POST /api/runNo API key required right now — this endpoint is free while CodeCompiler is in beta.

Request

curl --location --request POST 'https://codecompiler.forgesparse.com/api/run' \
--header 'Content-Type: application/json' \
--data-raw '{
  "language": "python",
  "version": "3.10.0",
  "files": [
    { "name": "main.py", "content": "print(\"Hello, \" + input())" }
  ],
  "stdin": "Peter"
}'

Response

{
  "stdout": "Hello, Peter\n",
  "stderr": "",
  "output": "Hello, Peter\n",
  "code": 0,
  "signal": null,
  "language": "python",
  "version": "3.10.0"
}

Field	Description
language	Language slug — see the supported languages table below.
version	Free-form version label, echoed back in the response.
files	Array of { name, content }. The first file is treated as the entry point; extra files are appended as commented sections.
stdin	Optional. Text piped to the program's standard input.
args	Optional array of CLI arguments, prepended to stdin for programs that read argv.
stdout / stderr / output	Captured program output. output mirrors JDoodle's combined stream; stdout/stderr are split heuristically.
code	0 on a clean run, 1 if a compile or runtime error was detected, null on infra errors.
error	Present only on failure — a short machine-readable label (see below).

Error responses

Failures come back as HTTP 200 with an error label so you can branch on it without checking status codes:

Unsupported language

The language slug isn't mapped to a runtime yet.

Missing JDoodle credentials

Server-side configuration issue — not something callers can fix.

Invalid credentials

JDoodle rejected the configured API keys.

Daily limit exceeded

The shared execution quota was hit — retry later.

Timeout

Execution took longer than 20 seconds and was aborted.

Network error

Could not reach the execution backend — safe to retry.

Supported languages

53 languages currently run through this API. Use the slug from the language column.

slug	name	category
javascript	JavaScript	popular
python	Python	popular
java	Java	popular
c	C	popular
cpp	C++	popular
csharp	C#	popular
go	Go	programming
rust	Rust	programming
ruby	Ruby	programming
php	PHP	popular
typescript	TypeScript	programming
nodejs	Node.js	popular
kotlin	Kotlin	programming
swift	Swift	programming
bash	Bash	programming
perl	Perl	programming
lua	Lua	popular
haskell	Haskell	programming
dart	Dart	programming
scala	Scala	programming
groovy	Groovy	popular
elixir	Elixir	programming
clojure	Clojure	programming
fsharp	F#	programming
fortran	Fortran	programming
cobol	COBOL	programming
pascal	Pascal	programming
r	R	programming
erlang	Erlang	programming
ocaml	OCaml	programming
d	D	programming
assembly	Assembly	popular
prolog	Prolog	programming
commonlisp	Common Lisp	programming
vbnet	Visual Basic	programming
deno	Deno	programming
python2	Python 2	programming
freebasic	FreeBASIC	programming
mysql	MySQL	database
sqlite	SQLite	database
postgresql	PostgreSQL	database
plsql	PL/SQL	database
mongodb	MongoDB	database
oracle	Oracle	database
redis	Redis	database
mariadb	MariaDB	database
sqlserver	SQL Server	database
cassandra	Cassandra	database
questdb	QuestDB	database
duckdb	DuckDB	database
surrealdb	SurrealDB	database
firebird	Firebird	database
clickhouse	ClickHouse	database

Embed Editor

Every language page on CodeCompiler is a clean, chrome-free editor — no site header or footer — so it drops straight into an iframe.

Embedding the default editor

<iframe
  frameBorder="0"
  height="450px"
  src="https://codecompiler.forgesparse.com/python"
  width="100%"
></iframe>

Embedding a specific language

Swap the path for any supported slug — e.g. /java, /javascript, /html.

<iframe
  frameBorder="0"
  height="450px"
  src="https://codecompiler.forgesparse.com/java"
  width="100%"
></iframe>

Query-parameter controls (hiding the language picker, dark theme, listening forpostMessageevents, etc.) aren't wired up yet — the iframe above embeds the full interactive editor as-is. Let us know what controls you need and we'll prioritize them.