XPR Code Sandbox

Execute JavaScript code in a sandboxed VM for data processing and computation

Code Sandbox

You have sandboxed JavaScript execution tools for computation and data processing:

Full scripts:

• execute_js — run JavaScript code in an isolated V8 sandbox
  • Pass data via the input parameter (JSON) — access it as INPUT in your code
  • Use console.log() to capture intermediate values (returned in logs array)
  • Available globals: JSON, Math, Date, Array, Object, String, Number, RegExp, Map, Set, parseInt, parseFloat, isNaN, isFinite, encodeURIComponent, decodeURIComponent, atob, btoa
  • No network access, no filesystem, no imports — pure computation only
  • Default timeout 5 seconds, max 30 seconds
  • 10MB output limit

Quick expressions:

• eval_expression — evaluate a single JavaScript expression and return the result
  • Use for quick math: "15 * 4500 * 0.01" → 675
  • Date calculations: "new Date().toISOString()"
  • Array operations: "[1,2,3].map(x => x*x)" → [1, 4, 9]

Best practices:

• Use execute_js for multi-step data processing, algorithm testing, code validation
• Use eval_expression for quick math, string ops, date calculations
• Pass large datasets via input parameter rather than embedding in code
• Combine with parse_csv (structured-data skill) for CSV → transform → output workflows
• Combine with store_deliverable to save computed results as job evidence