100 DataWeave Problems: Data Types & Type Coercion | Volume 2

Data Types & Type Coercion

100 Hands-On Problems for Converting, Validating & Normalising Data Between Systems

Master one of the most important parts of DataWeave 2.0 through 100 practical problems designed around real-world MuleSoft integration scenarios.

In real integrations, data rarely arrives in exactly the format your target system expects. A value may arrive as a String but be required as a Number, a date may use a different format, a Boolean may arrive as text, or a field may be null, empty, or missing.

This ebook focuses specifically on solving these challenges with practical DataWeave problems and complete solutions.

📚 What's Inside

100 practical DataWeave problems covering:

• String & String Coercion
• Numbers & Numeric Conversion
• Boolean Conversion
• Date, Time & DateTime Conversion
• Null, Empty & Missing Values
• Array Type Conversion
• Object Type Conversion
• Type Checking & Validation
• Mixed-Type Integration Scenarios
• Advanced Type Coercion & Edge Cases

🛠️ Real-World Integration Scenarios

Practice transformations involving:

• JSON → JSON
• CSV → JSON
• XML → JSON
• JSON → XML
• Salesforce → API
• Database → REST API
• SFTP → API
• API → Database
• Message Queue integrations
• Healthcare/FHIR-style data transformations

💡 Every Problem Includes

Scenario → Input → Requirement → DataWeave Code → Output → Explanation

So you don't just learn what syntax to use—you understand why and when to use it.

🎯 What You'll Learn

By completing these 100 problems, you'll become more confident with:

• as type coercion
• is type checking
• String ↔ Number conversion
• String ↔ Boolean conversion
• Date & DateTime parsing
• Date formatting
• Null-safe transformations
• Empty vs null vs missing fields
• Arrays containing different data types
• Nested data conversion
• Conditional type conversion
• Data validation
• Handling real integration edge cases

👨‍💻 Who Is This For?

Perfect for:

• MuleSoft Developers
• DataWeave Developers
• Integration Developers
• MuleSoft Interview Candidates
• MuleSoft Beginners
• Developers preparing for DataWeave coding rounds
• Professionals working with API, database, Salesforce, CSV and XML integrations

🚀 Why This Book?

Instead of reading hundreds of pages of theory, solve 100 focused problems and build your DataWeave skills through practice.

Whether you're preparing for a MuleSoft interview or working on production integrations, this volume gives you practical exercises around one of the most frequently encountered integration challenges:

Converting and validating data correctly as it moves between systems.

Part of the “1000 DataWeave Problems with Solutions” series.

Volume 2 — Data Types & Type Coercion