100 DataWeave Problems: Format Conversions | Volume 9

Format Conversions

100 Hands-On Problems for Mastering JSON, XML, CSV & DataWeave Format Transformations

In real-world MuleSoft integrations, data rarely stays in one format.

One system may send JSON, another may require XML, a database export may arrive as CSV, and a downstream API may expect a completely different structure.

This volume contains 100 practical DataWeave problems focused on converting, parsing, reading, writing, and reshaping data across the most commonly used integration formats.

📚 What's Inside

100 hands-on problems covering:

• JSON → JSON
• JSON → XML
• JSON → CSV
• XML → JSON
• XML → XML
• XML → CSV
• CSV → JSON
• CSV → XML
• CSV → CSV
• read
• write
• MIME Types
• Input & Output Formats
• CSV Headers
• CSV Separators
• XML Namespaces
• XML Attributes
• XML Elements
• Nested XML Structures
• Complex Cross-Format Transformations
• Format-Specific Data Handling
• Encoding & Parsing Scenarios

🛠️ Real-World Integration Scenarios

Practice transformations involving:

• REST API JSON responses
• SOAP/XML payloads
• CSV files from SFTP
• Database exports
• Salesforce API responses
• JSON → XML enterprise integrations
• XML → JSON API transformations
• CSV → JSON ingestion pipelines
• JSON → CSV reporting files
• XML files → downstream APIs
• Reading serialized data with read
• Generating formatted content with write
• Converting complex nested structures between formats

💡 Every Problem Includes

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

Each problem is designed to demonstrate how DataWeave handles real format-conversion requirements—not just simple syntax examples.

🎯 What You'll Learn

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

• Converting JSON, XML and CSV
• Using read() to parse data
• Using write() to generate data
• Controlling output MIME types
• Handling CSV headers and separators
• Working with XML elements and attributes
• Handling XML namespaces
• Transforming nested XML structures
• Converting arrays and objects between formats
• Preserving the required target structure
• Handling format-specific differences
• Building clean cross-format transformations
• Combining format conversion with business logic

📈 Progressive Difficulty

The problems progress from basic format conversions to complex multi-step transformations.

You'll begin with straightforward JSON, XML and CSV conversions and gradually work with nested structures, XML namespaces, CSV configuration, read/write, and realistic enterprise integration scenarios.

👨‍💻 Who Is This For?

Perfect for:

• MuleSoft Developers
• DataWeave Developers
• Integration Developers
• MuleSoft Interview Candidates
• DataWeave Beginners
• Developers preparing for DataWeave coding rounds
• Professionals working with REST, SOAP, SFTP, CSV and enterprise integrations

🚀 Why This Book?

Integration systems speak different data languages.

JSON for REST APIs.

XML for enterprise and SOAP systems.

CSV for files and data exchange.

The real DataWeave skill is being able to move between these formats cleanly, predictably, and correctly.

This volume gives you 100 focused problems to practice exactly that skill.

Learn the format. Write the transformation. Validate the output. Build real integration skills.

📖 Part of the 1000 DataWeave Problems with Solutions Series

Volume 9 — Format Conversions

100 Problems • 100 Solutions • Real Integration Scenarios

Master JSON, XML and CSV transformations one problem at a time.