JexLang is a lightweight expression language designed for embedding expressions and simple logic in applications.
JexLang addresses the common need for runtime-evaluated expressions and formulas in modern applications. Instead of hardcoding business logic, JexLang enables dynamic expressions that can be stored, modified, and evaluated without redeployment.
- Field Validation Rules: Define complex validation rules that can be evaluated client-side or server-side
- Conditional Field Visibility: Show or hide fields based on values of other fields
- Cross-Field Dependencies: Auto-populate or modify fields based on changes to related fields
- Custom Error Messages: Generate dynamic error messages based on field values
- Quote Calculations: Implement configurable pricing and quoting formulas that business users can update
- Eligibility Rules: Define complex criteria for product eligibility, discounts, or service tiers
- Approval Workflows: Create conditional approval paths based on dynamic business criteria
- Rating Engines: Build insurance or credit scoring systems with modifiable calculation logic
- Feature Flags with Conditions: Enable features based on complex user attributes or environmental factors
- A/B Test Rules: Define sophisticated test segmentation without code changes
- Personalization Logic: Tailor content based on user behavior using configurable rules
- Shared Validation Logic: Use the same rules across web, mobile, and backend systems
- Platform-Agnostic Rules: Write once, run in JavaScript, Java, and other supported languages
- Consistent Calculation Results: Ensure identical outputs across different environments
- Security: Safer than eval()-based solutions, with controlled execution environments
- Performance: Lightweight parser and interpreter optimized for frequent evaluations
- Type Safety: Optional type checking for expressions to catch errors early
- Readability: Syntax familiar to developers and approachable to technical business users
- Extensibility: Easy to add custom functions and operators for domain-specific needs
- Cross-Platform: Same expressions work across frontend, backend, and mobile environments
JexLang is available in multiple language implementations: