What is a Script Task in BPMN?

A Script Task executes inline code within the process engine. The script runs directly without calling external services, making it ideal for calculations, transformations, and simple logic.

When should I use a Script Task?

Use Script Tasks for quick calculations, data transformations, and setting variables. For external API calls, use Service Tasks. Keep scripts simple-complex logic should be in external services.

How is the Script Task different from related elements?

Script Tasks run inline code within the engine; Service Tasks call external services. Script Tasks are faster but engine-dependent. Service Tasks are better for complex business logic and reusability.

activitiesVariant of Task

Script Task

A Script Task executes an automated script written in a language the process engine can interpret. Unlike Service Tasks that call external services, Script Tasks run inline code within the engine.

What is a Script Task?

A Script Task executes code scripts directly within the process engine. The script is typically written in JavaScript, Groovy, Python, or another language supported by the engine, running inline without external service calls.

Visual Representation

A Script Task shows a rounded rectangle containing a document/script icon (often depicted as a page with lines). This represents the inline code or script to be executed.

Key Characteristics

Inline execution: Script runs within the process engine, not externally
Engine-dependent: Available languages depend on the process engine
Variable access: Can read and write process variables directly
Quick logic: Ideal for simple calculations, transformations, or data manipulation

See it in action

A script calculates production parameters automatically

Read: Fastfore →

Common mistake

Putting complex business logic in a Script Task. Script Tasks should be lightweight (data transforms, calculations). For complex logic, use a Service Task calling a proper service.

How it connects

Service TaskService Tasks call external services; Script Tasks run inline code within the process engine itself Business RuleBusiness Rule Tasks evaluate decision tables; Script Tasks run arbitrary code — use rules for business-manageable logic TaskAbstract Task leaves execution unspecified; Script Task explicitly marks it as inline automated code User TaskScript Tasks run without human input; consider a User Task if someone needs to review the result

Common Use Cases

Data Calculation

Calculate order totals, tax amounts, and discounts using a simple inline script.

Variable Transformation

Transform data formats or concatenate fields before passing to the next activity.

Conditional Logic

Evaluate complex conditions and set flag variables for downstream gateway decisions.

Frequently Asked Questions

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