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    Home  >   FAQs   >  How to write code for Server Scripts and Jobs?
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    How to write code for Server Scripts and Jobs?

    Table of Contents
    Check for the following while writing a script:
    • Scripts are written in JavaScript.
    • All code must be contained within a main method. Anything outside this method will not execute.
    • The main method is invoked automatically and you do not need to call it.
    • You can utilize basic JavaScript methods like Math functions and JSON methods.
    • You can also use Helper methods like HTTP request methods, Vtiger’s REST API or Webservice methods, and log methods for debugging.
    Following are a few restrictions:
    • Certain JavaScript methods like setTimeout, setInterval, exec, and eval are restricted due to potential security risks or delays in execution.
    • Importing external modules using require or import is restricted for security reasons.
    • You cannot define additional functions but can use arrow functions as sub-functions.
     

    Limitations 

    Following are the limitation for writing server scripts:
    • Code must be within the main() method; anything outside will not be executed.
    • Server script execution has a limit of 15 sec and 32 MB of memory.
    • Hourly server jobs can run for up to 90 sec with 128 MB of memory.
    • Other server jobs can run for up to 4 mins with 128 MB of memory.
    • Scheduled workflows or processes cannot use server scripts.
    • Daily execution limits apply to server scripts and jobs. If exceeded, they run the next day or are skipped.
    • Avoid using JavaScript functions like require, import, eval, setTimeout, and setInterval.
    • Use await instead of .then() to handle promises from request and webservice methods.
    • Use try-catch to handle errors from request and webservice methods.
    • HTTP requests are only allowed for secure websites (https) with valid SSL certificates.
    • Direct IPs, localhost, and Vtiger domains are not allowed for HTTP requests, except the CRM instance URL where the script is invoked.
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