Judge0-compatible API

Code written for Judge0 CE runs here with two changes: point its base URL at https://api.onlinecompiler.io/api/judge0, and send your API key in X-Auth-Token (or Authorization). Submissions, tokens, batches, base64_encoded, fields, expected_output, callbacks and status ids work as on Judge0, and wait=true works too.

curl -X POST "https://api.onlinecompiler.io/api/judge0/submissions?wait=true" \
  -H "X-Auth-Token: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "language_id": 71,
    "source_code": "print(int(input()) * 2)",
    "stdin": "21",
    "expected_output": "42"
  }'

Response (201)

{
  "token": "6f1c2b9e-0d4a-4a53-9f7e-2b8c1d3e4f50",
  "time": "0.0213",
  "memory": 9216,
  "stdout": "42\n",
  "stderr": null,
  "compile_output": null,
  "message": null,
  "status": { "id": 3, "description": "Accepted" }
}

Differences from Judge0

• Older language ids, such as 71 for Python 3.8 and 62 for Java 13, run on the current version. Ids for other languages answer 422.
• The lower of cpu_time_limit and wall_time_limit, capped at 30 seconds, stops the run and gives Time Limit Exceeded; compiling does not count, Java, Groovy and F# get a start-up allowance on top (Java (1 s), Groovy (1.5 s) and F# (2.5 s)), and 0 means no limit of your own. time is wall-clock seconds. The other limits are accepted and ignored: every run gets our memory limit.
• time is the run command's wall-clock seconds, which for Java, F#, TypeScript, Dart, Erlang, Elixir, Clojure and Groovy includes compiling as they start.
• Compilation Error (6) comes with compile_output for C, C++, C#, Go, Rust, Haskell, Fortran, Visual Basic, Kotlin, Swift, COBOL, Pascal, Assembly, OCaml, D, FreeBASIC, Scala and Objective-C. The other languages compile or check code as they run, so their compile errors are Runtime Error (NZEC) with the message in stderr.
• compiler_options, command_line_arguments, additional_files and enable_network answer 422.
• A batch is admitted whole or not at all. Account limits answer 429 and a queue failure 503, both as {"error": "..."}.
• There is no listing or deleting submissions, and compile_cmd and run_cmd are null; our commands are listed above.

Moving a Judge0 integration? See the Judge0 migration guide.