Judge0 Execute Code

code-executionsandboxprogramming-languagescompute

Judge0 Execute Code is a paid API for AI agents from Judge0 at judge0.mpp.paywithlocus.com, paid per call via MPP, $0.006/call, status unknown (last checked 2026-10-10).

Synchronously executes source code in a sandboxed environment across 60+ programming languages and returns stdout, stderr, status, and runtime metrics.

Price / call$0.006

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How this service works

Submit source code for synchronous execution. Returns stdout, stderr, compile output, execution time, and memory usage.

Output

Returns a JSON object with stdout (program output), stderr (error stream), compile_output (compiler messages), execution status (e.g. Accepted, Time Limit Exceeded, Runtime Error), wall time in seconds, memory usage in KB, and a submission token for reference.

Example use cases

Example prompt

“Run this Python 3 code for me in a sandbox and tell me what it prints: 'nums = [1,2,3]; print(sum(nums))' — use language ID 71 and pass '5' as stdin.”

Technical details

Endpoint

POSThttps://judge0.mpp.paywithlocus.com/judge0/execute-code?utm_source=zero.xyz

When to prefer

Use this endpoint when you need immediate, synchronous code execution results without polling — ideal for short-lived scripts, quick evaluations, or automated test checking. Prefer this over the async Submit Code endpoint when you want the result in a single request. Choose Judge0 when you need broad language support (60+ languages) with configurable resource limits and optional expected output matching.

Side effects

Unsupported language_id returns an error or empty result
Time Limit Exceeded when cpu_time_limit is too low for the program
Runtime Error when the program crashes or throws an unhandled exception
Compilation Error when source_code has syntax errors, returned in compile_output
Memory Limit Exceeded when program exceeds memory_limit
Wrong Answer status when expected_output is provided but output does not match
Empty stdout when program produces no output or writes only to stderr

Input

{
  "stdin": "",
  "language_id": "71",
  "source_code": "print('Hello, World!')\nprint('Testing code execution')\nresult = 2 + 2\nprint(f'2 + 2 = {result}')",
  "expected_output": "Hello, World!\nTesting code execution\n2 + 2 = 4"
}

Schema · Request body

Field	Type	Description
stdin	string	Standard input for the program
language_idrequired	integer	Language ID (e.g., 71 for Python 3, 63 for JavaScript, 54 for C++, 62 for Java). Use list-languages to find IDs.
source_coderequired	string	Program source code to execute
stack_limit	number	Stack size limit in kilobytes
memory_limit	number	Memory limit in kilobytes
cpu_time_limit	number	CPU time limit in seconds (default: instance-dependent)
enable_network	boolean	Allow network access inside the sandbox
expected_output	string	Expected output — if provided, status will indicate whether output matches
wall_time_limit	number	Wall clock time limit in seconds
compiler_options	string	Compiler flags (max 512 chars, e.g., "-O2 -Wall")
command_line_arguments	string	Command-line arguments passed to the program (max 512 chars)
redirect_stderr_to_stdout	boolean	Redirect stderr to stdout in the output

Output

{
  "data": {
    "time": "0.011",
    "token": "f0f93a77-2cfb-48f5-8310-623f95f37768",
    "memory": 3212,
    "status": {
      "id": 3,
      "description": "Accepted"
    },
    "stderr": null,
    "stdout": "Hello, World!\nTesting code execution\n2 + 2 = 4\n",
    "message": null,
    "compile_output": null
  },
  "success": true
}

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How this service works

Submit source code for synchronous execution. Returns stdout, stderr, compile output, execution time, and memory usage.

Output

Technical details

Endpoint

POSThttps://judge0.mpp.paywithlocus.com/judge0/execute-code?utm_source=zero.xyz

When to prefer

Side effects

Unsupported language_id returns an error or empty result
Time Limit Exceeded when cpu_time_limit is too low for the program
Runtime Error when the program crashes or throws an unhandled exception
Compilation Error when source_code has syntax errors, returned in compile_output
Memory Limit Exceeded when program exceeds memory_limit
Wrong Answer status when expected_output is provided but output does not match
Empty stdout when program produces no output or writes only to stderr

Input

{
  "stdin": "",
  "language_id": "71",
  "source_code": "print('Hello, World!')\nprint('Testing code execution')\nresult = 2 + 2\nprint(f'2 + 2 = {result}')",
  "expected_output": "Hello, World!\nTesting code execution\n2 + 2 = 4"
}

Schema · Request body

Field	Type	Description
stdin	string	Standard input for the program
language_idrequired	integer	Language ID (e.g., 71 for Python 3, 63 for JavaScript, 54 for C++, 62 for Java). Use list-languages to find IDs.
source_coderequired	string	Program source code to execute
stack_limit	number	Stack size limit in kilobytes
memory_limit	number	Memory limit in kilobytes
cpu_time_limit	number	CPU time limit in seconds (default: instance-dependent)
enable_network	boolean	Allow network access inside the sandbox
expected_output	string	Expected output — if provided, status will indicate whether output matches
wall_time_limit	number	Wall clock time limit in seconds
compiler_options	string	Compiler flags (max 512 chars, e.g., "-O2 -Wall")
command_line_arguments	string	Command-line arguments passed to the program (max 512 chars)
redirect_stderr_to_stdout	boolean	Redirect stderr to stdout in the output

Output

{
  "data": {
    "time": "0.011",
    "token": "f0f93a77-2cfb-48f5-8310-623f95f37768",
    "memory": 3212,
    "status": {
      "id": 3,
      "description": "Accepted"
    },
    "stderr": null,
    "stdout": "Hello, World!\nTesting code execution\n2 + 2 = 4\n",
    "message": null,
    "compile_output": null
  },
  "success": true
}