Master Data Transformation with the Complete Node Set Guide

# n8n Set Node Tutorial - Complete Guide ## How It Works This tutorial workflow teaches you everything about n8n's **Set node** through hands-on examples. The Set node is one of the most powerful tools in n8n - it allows you to create, modify, and transform data as it flows through your workflow. **What makes this tutorial special:** - **Progressive Learning**: Starts simple, builds to complex concepts - **Interactive Examples**: Real working nodes you can modify and test - **Visual Guidance**: Sticky notes explain every concept - **Branching Logic**: Shows how Set nodes work in different workflow paths - **Real Data**: Uses practical examples you'll encounter in automation The workflow demonstrates 6 core concepts: 1. **Basic data types** (strings, numbers, booleans) 2. **Expression syntax** with `{{ }}` and `$json` references 3. **Complex data structures** (objects and arrays) 4. **Keep Only Set** option for clean outputs 5. **Conditional data setting** with branching logic 6. **Data transformation** and aggregation techniques ## Setup Steps ### Step 1: Import the Workflow 1. **Copy the JSON** from the code artifact above 2. **Open your n8n instance** in your browser 3. **Navigate to Workflows** section 4. **Click Import from JSON** or the import button (usually a + or import icon) 5. **Paste the JSON** into the import dialog 6. **Click Import** to load the workflow 7. **Save the workflow** (Ctrl+S or click Save button) ### Step 2: Choose Your Starting Point **Option A: Default Tutorial Mode (Recommended for beginners)** - The workflow is ready to run as-is - Uses simple Welcome message as starting data - **Click Execute Workflow** to begin **Option B: Rich Test Data Mode (Recommended for experimentation)** 1. **Locate the nodes**: Find Start (Manual Trigger) and 0. Test Data Input 2. **Disconnect default**: Click the connection line between Start (Manual Trigger) and 1. Set Basic Values and delete it 3. **Connect test data**: Drag from 0. Test Data Input output to 1. Set Basic Values input 4. **Execute**: Click Execute Workflow to run with rich test data ### Step 3: Execute and Learn 1. **Run the workflow**: Click the Execute Workflow button 2. **Check outputs**: Click on each node to see its output data 3. **Read the notes**: Each sticky note explains what's happening 4. **Follow the flow**: Data flows from left to right, top to bottom ### Step 4: Experiment and Modify **Try These Experiments:** **Change Basic Values:** - Click on 1. Set Basic Values - Modify `user_age` (try 20 vs 35) - Change `user_name` to see how it propagates - Execute and see the changes flow through **Test Conditional Logic:** - Set `user_age` to 20 triggers Student Discount path - Set `user_age` to 30 triggers Premium Access path - Watch how the workflow branches differently **Modify Expressions:** - In 2. Set with Expressions, try changing: - `={{ $json.score * 2 }}` to `={{ $json.score * 3 }}` - `={{ $json.user_name }} Smith` to `={{ $json.user_name }} Johnson` **Complex Data Structures:** - In 3. Set Complex Data, modify the JSON structure - Add new properties to the user_profile object - Try nested expressions ## Learning Path ### Beginner Level (Nodes 1-2) - **Focus**: Understanding basic Set operations - **Learn**: Data types, static values, simple expressions - **Time**: 10-15 minutes ### Intermediate Level (Nodes 3-4) - **Focus**: Complex data and output control - **Learn**: Objects, arrays, Keep Only Set option - **Time**: 15-20 minutes ### Advanced Level (Nodes 5-6) - **Focus**: Conditional logic and data aggregation - **Learn**: Branching workflows, merging data, complex expressions - **Time**: 20-25 minutes ## What Each Node Teaches | Node | Concept | Key Learning | |------|---------|--------------| | **1. Set Basic Values** | Data Types | String, number, boolean basics | | **2. Set with Expressions** | Dynamic Data | `{{ }}` syntax, `$json` references, `$now` functions | | **3. Set Complex Data** | Advanced Structures | Objects, arrays, nested properties | | **4. Set Clean Output** | Data Management | Keep Only Set for clean final outputs | | **5a/5b. Conditional Sets** | Branching Logic | Different data based on conditions | | **6. Tutorial Summary** | Data Aggregation | Combining and summarizing workflow data | ## Pro Tips **Quick Wins:** - Always check node outputs after execution - Use sticky notes as your learning guide - Experiment with small changes first - Copy nodes to try variations **Advanced Techniques:** - Use `Keep Only Set` for API responses - Combine static and dynamic data in complex objects - Leverage conditional paths for different user types - Reference nested object properties with dot notation **Troubleshooting:** - If expressions don't work, check the `{{ }}` syntax - Ensure field names match exactly (case-sensitive) - Use the expression editor for complex logic - Check data types