Interactive Tutorial for JSON Data Handling and Expressions - n8n Workflow

New n8n users who need to understand how data is handled and processed within an n8n workflow.
Automation developers who frequently encounter JSON data errors.
Anyone looking for practical n8n templates focusing on core data manipulation skills.
Users aiming to master the critical n8n expression language for cross-node data referencing.

JSON (JavaScript Object Notation) is the universal data format for modern applications, and understanding its structure is foundational to mastering any automation platform. This essential n8n templates workflow functions as a hands-on guide, walking you through every core JSON data type: strings, numbers, booleans, nulls, arrays, and complex objects. The primary value of this instructional n8n workflow is demonstrating how to access and reuse data from one n8n node in another using the powerful n8n expression syntax. By executing this n8n workflow step-by-step and reading the embedded notes, you will gain the foundational knowledge required to build robust and reliable automations using any n8n node.

This n8n workflow is structured as a sequential lesson plan, driven by manual execution:

1. Execution Start: The n8n workflow begins with the Execute to Start manual n8n trigger, initiating the interactive tutorial.


2. Data Type Lessons: A sequence of Set n8n node components (Key & Value, String, Number, Boolean, Null, Array, Object) are executed. Each n8n node explicitly defines and outputs a specific JSON data type, allowing the user to examine the output pane and understand the correct syntax (e.g., numbers without quotes, strings with quotes).


3. Expression Magic: The crucial Using JSON (Expressions) n8n node demonstrates cross-node communication. It uses the n8n expression editor ({{ }}) to dynamically pull specific data points (like the number value or a nested key) from the preceding n8n nodes.


4. Final Summary: The Final Exam n8n node consolidates the learning. It uses complex expressions to gather data from nearly every previous n8n node component, assembling a single, complete JSON object, thus verifying the user's ability to access diverse data types throughout the n8n workflow.

To start learning with this instructional n8n template, follow these steps:

1. Import: Copy the full n8n workflow JSON code provided above.


2. Access n8n: Navigate to your n8n instance and click the 'New' button or the 'Import Workflow' option.


3. Paste: Paste the copied JSON into the import field.


4. Execution: Since this n8n template uses a manual n8n trigger (Execute to Start), no credentials are required. Simply click 'Execute Workflow' in the top right corner.


5. Interactive Learning: After execution, click on each subsequent n8n node in order (from Key & Value to Final Exam). Read the associated Sticky Notes and observe the node output to understand how JSON data is created and transformed within the n8n workflow.

Execute to Start (Manual n8n Trigger): Initiates the n8n workflow on command. It's the starting n8n node for the manual tutorial.
Key & Value (Set n8n Node): The first lesson, establishing the fundamental key: value pair structure used in JSON.
String, Number, Boolean, Null, Array, Object (Set n8n Nodes): A series of n8n node lessons demonstrating the syntax for each standard JSON data type. Key Configuration: Uses the 'Assignments' feature to explicitly define the respective data type for the output field.
Using JSON (Expressions) (Set n8n Node): Crucial n8n node for demonstrating data linkage. Function: Uses expressions (e.g., $()) to reference data stored in previous n8n nodes like 'Number' or 'Object'.

• Final Exam (Set n8n Node): The concluding n8n node. Function: Consolidates data from all prior steps into a single output object using multiple expressions, serving as a final demonstration of data traversal within the n8n workflow structure.