Lucas Peyrin This workflow corresponds to n8n.io template #5271 — we link there as the canonical source.
The workflow JSON
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{
"meta": {
"creator": "Lucas Peyrin",
"fingerprint": "<redacted-credential>"
},
"nodes": [
{
"id": "2c20bdef-e54e-46ab-9c63-5cf521ec749e",
"cid": "Ikx1Y2FzIFBleXJpbiI",
"name": "Start Tutorial",
"type": "n8n-nodes-base.manualTrigger",
"notes": "\u00a9 2025 Lucas Peyrin",
"creator": "Lucas Peyrin",
"position": [
-7360,
992
],
"parameters": {},
"typeVersion": 1
},
{
"id": "25703548-3e48-4951-9e3b-1d7815e15af5",
"cid": "Ikx1Y2FzIFBleXJpbiI",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"notes": "\u00a9 2025 Lucas Peyrin",
"creator": "Lucas Peyrin",
"position": [
-7616,
592
],
"parameters": {
"color": 5,
"width": 640,
"height": 560,
"content": "# Tutorial - Mastering n8n Expressions\n\nWelcome! You know what JSON is. Now, let's learn how to **use it**. This workflow teaches you how to pull data from one node and use it in another using n8n's powerful expressions.\n\n**What is an Expression?**\nAn expression is a small piece of code inside double curly braces `{{ }}` that gets replaced with a dynamic value when the workflow runs. It's the \"glue\" that connects your nodes.\n\n**How to use this tutorial:**\n1. The first node, **\"Source Data\"**, contains all the data we will use. Execute it once to see what's inside.\n2. Follow the path from top to bottom. Each node is a new lesson.\n3. Read the sticky note for each lesson, then look at the node's configuration and its output to understand the concept."
},
"typeVersion": 1
},
{
"id": "b875f86c-a790-49bc-96a0-e1ccc72a5e80",
"cid": "Ikx1Y2FzIFBleXJpbiI",
"name": "Source Data",
"type": "n8n-nodes-base.set",
"notes": "\u00a9 2025 Lucas Peyrin",
"creator": "Lucas Peyrin",
"position": [
-6720,
992
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "12345",
"name": "name",
"type": "string",
"value": "Alice"
},
{
"id": "67890",
"name": "age",
"type": "number",
"value": 30
},
{
"id": "abcde",
"name": "is_active",
"type": "boolean",
"value": true
},
{
"id": "fghij",
"name": "skills",
"type": "array",
"value": "[\"JavaScript\",\"Python\",\"n8n\"]"
},
{
"id": "klmno",
"name": "projects",
"type": "array",
"value": "[{\"name\":\"Project A\",\"status\":\"Done\"},{\"name\":\"Project B\",\"status\":\"In Progress\"}]"
},
{
"id": "pqrst",
"name": "contact",
"type": "object",
"value": "{\"email\":\"user@example.com\",\"phone\":null}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "108d6d9a-6e98-491d-87c1-78d3680f0c40",
"cid": "Ikx1Y2FzIFBleXJpbiI",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"notes": "\u00a9 2025 Lucas Peyrin",
"creator": "Lucas Peyrin",
"position": [
-6944,
640
],
"parameters": {
"color": 7,
"width": 520,
"height": 520,
"content": "## Our Data Source\n\nThis node holds all the sample data for our tutorial. Think of it as a filing cabinet. All the other nodes will be reaching into this cabinet to pull out specific pieces of information.\n\nTake a look at its output to familiarize yourself with the structure.\nWe have:\n- Simple text (`name`)\n- A number (`age`)\n- A list of skills (`skills`)\n- A list of complex projects (`projects`)\n- A nested contact object (`contact`)"
},
"typeVersion": 1
},
{
"id": "54723ed3-94c5-4104-b1c5-3ac70c262b87",
"cid": "Ikx1Y2FzIFBleXJpbiI",
"name": "1. The Basics",
"type": "n8n-nodes-base.set",
"notes": "\u00a9 2025 Lucas Peyrin",
"creator": "Lucas Peyrin",
"position": [
-6192,
992
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "12345",
"name": "user_name",
"type": "string",
"value": "={{ $('Source Data').item.json.name }}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "81dc9611-b9b5-41c3-a5ab-460cb0dc1ca6",
"cid": "Ikx1Y2FzIFBleXJpbiI",
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"notes": "\u00a9 2025 Lucas Peyrin",
"creator": "Lucas Peyrin",
"position": [
-6400,
576
],
"parameters": {
"color": 2,
"width": 500,
"height": 580,
"content": "## Lesson 1: Accessing a Simple Value\n\nThis is the most common thing you'll do in n8n.\n\n**The Goal:** Get the user's name from the \"Source Data\" node.\n\n**The Expression:** `{{ $('Source Data').item.json.name }}`\n\n**Breakdown:**\n- `{{ ... }}`: Tells n8n \"this is a dynamic expression\".\n- `$('Source Data')`: Selects the node we want data from.\n- `.item.json`: Narrows it down to the JSON data of the current item.\n- `.name`: Selects the specific **key** we want the value of.\n\n**Other Possibility:**\n`{{ $json.name }}` would also work in this case, as `$json` accesses the data from the previous node."
},
"typeVersion": 1
},
{
"id": "b91f6099-5207-4000-9a0e-e6374718c123",
"cid": "Ikx1Y2FzIFBleXJpbiI",
"name": "3. Working with Arrays",
"type": "n8n-nodes-base.set",
"notes": "\u00a9 2025 Lucas Peyrin",
"creator": "Lucas Peyrin",
"position": [
-4960,
992
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "12345",
"name": "second_skill",
"type": "string",
"value": "={{ $('Source Data').last().json.skills[1] }}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "2074d65b-2d6b-41af-a4f9-fa9a195a1bf8",
"cid": "Ikx1Y2FzIFBleXJpbiI",
"name": "Sticky Note3",
"type": "n8n-nodes-base.stickyNote",
"notes": "\u00a9 2025 Lucas Peyrin",
"creator": "Lucas Peyrin",
"position": [
-5168,
624
],
"parameters": {
"color": 4,
"width": 540,
"height": 520,
"content": "## Lesson 3: Accessing an Array Element\n\nWhat if the data is in a list (an array)? You need to specify *which* item you want.\n\n**The Goal:** Get the user's *second* skill.\n\n**The Expression:** `{{ $('Source Data').last().json.skills[1] }}`\n\n**Breakdown:**\n- `...skills`: Selects the array of skills.\n- `[1]`: Selects the item at a specific position.\n- **IMPORTANT:** Arrays are \"zero-indexed\", which means the first item is `[0]`, the second is `[1]`, the third is `[2]`, and so on."
},
"typeVersion": 1
},
{
"id": "8ccc139f-0e8c-4c25-9d04-cecf2b335934",
"cid": "Ikx1Y2FzIFBleXJpbiI",
"name": "4. Going Deeper",
"type": "n8n-nodes-base.set",
"notes": "\u00a9 2025 Lucas Peyrin",
"creator": "Lucas Peyrin",
"position": [
-4400,
992
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "12345",
"name": "user_email",
"type": "string",
"value": "={{ $('Source Data').last().json.contact.email }}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "34264c0c-8282-4b57-a066-0548a31cbf1a",
"cid": "Ikx1Y2FzIFBleXJpbiI",
"name": "Sticky Note4",
"type": "n8n-nodes-base.stickyNote",
"notes": "\u00a9 2025 Lucas Peyrin",
"creator": "Lucas Peyrin",
"position": [
-4608,
672
],
"parameters": {
"color": 5,
"width": 540,
"height": 480,
"content": "## Lesson 4: Accessing Nested Data\n\nSometimes, data is organized into objects within other objects.\n\n**The Goal:** Get the user's email address.\n\n**The Expression:** `{{ $('Source Data').last().json.contact.email }}`\n\n**Breakdown:**\n- `...contact`: First, we access the `contact` object.\n- `.email`: Then, we use another dot `.` to go one level deeper and get the value of the `email` key inside it."
},
"typeVersion": 1
},
{
"id": "4c41fb6a-5f93-408f-9583-1e118d139dcf",
"cid": "Ikx1Y2FzIFBleXJpbiI",
"name": "5. The Combo Move",
"type": "n8n-nodes-base.set",
"notes": "\u00a9 2025 Lucas Peyrin",
"creator": "Lucas Peyrin",
"position": [
-3808,
992
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "12345",
"name": "first_project_status",
"type": "string",
"value": "={{ $('Source Data').last().json.projects[0].status }}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "2123cd02-5cb6-4dd7-89e5-7af1c6edf234",
"cid": "Ikx1Y2FzIFBleXJpbiI",
"name": "Sticky Note5",
"type": "n8n-nodes-base.stickyNote",
"notes": "\u00a9 2025 Lucas Peyrin",
"creator": "Lucas Peyrin",
"position": [
-4048,
672
],
"parameters": {
"color": 6,
"width": 580,
"height": 480,
"content": "## Lesson 5: Accessing Data in an Array of Objects\n\nThis is the ultimate test of the previous lessons!\n\n**The Goal:** Get the *status* of the *first* project in the list.\n\n**The Expression:** `{{ $('Source Data').last().json.projects[0].status }}`\n\n**Breakdown:**\n1. `...projects`: We select the array of projects.\n2. `[0]`: We pick the first object in that array.\n3. `.status`: From that chosen object, we grab the value of the `status` key."
},
"typeVersion": 1
},
{
"id": "f25a5a9d-518d-4a4a-b2ad-36fd0e1f5bd2",
"cid": "Ikx1Y2FzIFBleXJpbiI",
"name": "6. A Touch of Magic",
"type": "n8n-nodes-base.set",
"notes": "\u00a9 2025 Lucas Peyrin",
"creator": "Lucas Peyrin",
"position": [
-3200,
992
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "12345",
"name": "name_in_caps",
"type": "string",
"value": "={{ $('Source Data').last().json.name.toUpperCase() }}"
},
{
"id": "67890",
"name": "age_in_dog_years",
"type": "number",
"value": "={{ Math.round($('Source Data').last().json.age / 7) }}"
},
{
"id": "abcde",
"name": "age_data_type",
"type": "string",
"value": "={{ typeof $('Source Data').last().json.age }}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "0ebf5e6b-feb8-4f32-9979-9d7555b461ed",
"cid": "Ikx1Y2FzIFBleXJpbiI",
"name": "Sticky Note6",
"type": "n8n-nodes-base.stickyNote",
"notes": "\u00a9 2025 Lucas Peyrin",
"creator": "Lucas Peyrin",
"position": [
-3440,
640
],
"parameters": {
"color": 3,
"width": 580,
"height": 520,
"content": "## Lesson 6: A Touch of Magic (JS Functions)\n\nYou can do more than just retrieve data; you can **manipulate and inspect it!**\n\n**The Expressions:**\n- **Transform Text:** `{{ $('Source Data').last().json.name.toUpperCase() }}`\n- **Do Math:** `{{ Math.round($('Source Data').last().json.age / 7) }}`\n- **Check Data Type:** `{{ typeof $('Source Data').last().json.age }}`\n\n**Breakdown:**\n- **`.toUpperCase()`**: A standard JavaScript function for strings.\n- **`Math.round(...)`**: The `Math` object gives you access to powerful math functions.\n- **`typeof`**: An operator that tells you what kind of data you're looking at (\"string\", \"number\", \"object\", etc.)."
},
"typeVersion": 1
},
{
"id": "81d8c2d6-95cc-47e3-b0f0-9c698a120d1c",
"cid": "Ikx1Y2FzIFBleXJpbiI",
"name": "9. The \"All Items\" View",
"type": "n8n-nodes-base.set",
"notes": "\u00a9 2025 Lucas Peyrin",
"creator": "Lucas Peyrin",
"position": [
-1264,
992
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "12345",
"name": "all_skills_string",
"type": "string",
"value": "={{ $('Split Out Skills').all().map(item => item.json.skills).join(', ') }}"
}
]
}
},
"executeOnce": true,
"typeVersion": 3.4
},
{
"id": "609e27f8-1702-493e-bc8b-cbade4561bd2",
"cid": "Ikx1Y2FzIFBleXJpbiI",
"name": "Sticky Note7",
"type": "n8n-nodes-base.stickyNote",
"notes": "\u00a9 2025 Lucas Peyrin",
"creator": "Lucas Peyrin",
"position": [
-1696,
640
],
"parameters": {
"color": 5,
"width": 780,
"height": 520,
"content": "## Lesson 9: Working with Multiple Items (`$items` & Arrow Functions)\n\nWhat if a node outputs *multiple* items and you want to summarize them? `$items()` is your tool.\n\n**The Goal:** Get a single, comma-separated string of all the user's skills.\n\n**The Expression:** `{{ $('Split Out Skills').all().map(item `=>` item.json.skills).join(', ') }}`\n\n**What is `item => ...`?**\nThis is an **Arrow Function**, a shorthand for \"for each thing, do this\".\n- `item`: A temporary name for each item in the list as we loop over it.\n- =>: The \"arrow\" that separates the item from the action.\n- `item.json.skills`: The action to perform\u2014in this case, get the skill value from the item."
},
"typeVersion": 1
},
{
"id": "d6afc595-c6f0-47b2-894e-b03d6a0227ee",
"cid": "Ikx1Y2FzIFBleXJpbiI",
"name": "Final Exam",
"type": "n8n-nodes-base.set",
"notes": "\u00a9 2025 Lucas Peyrin",
"creator": "Lucas Peyrin",
"position": [
-688,
992
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "12345",
"name": "final_summary",
"type": "string",
"value": "=User {{ $('2. The n8n Selectors').last().json.user_name_from_first }} is {{ $('Source Data').last().json.age }}.\n\nTheir best skill is {{ $('3. Working with Arrays').last().json.second_skill }}.\n\nTheir first project was {{ $('Source Data').last().json.projects[0].name }}, which is now {{ $('5. The Combo Move').last().json.first_project_status }}.\n\nAll skills: {{ $('9. The \"All Items\" View').last().json.all_skills_string }}."
}
]
}
},
"typeVersion": 3.4
},
{
"id": "99a7fb24-491c-436e-a775-6fabdc2c4004",
"cid": "Ikx1Y2FzIFBleXJpbiI",
"name": "Sticky Note8",
"type": "n8n-nodes-base.stickyNote",
"notes": "\u00a9 2025 Lucas Peyrin",
"creator": "Lucas Peyrin",
"position": [
-896,
736
],
"parameters": {
"color": 6,
"width": 520,
"height": 420,
"content": "## \ud83c\udf93 FINAL EXAM: Putting It All Together\n\nThis node uses everything we've learned to build a final summary object.\n\nLook at the expressions for each field. They pull data from different nodes and use different techniques you've just practiced.\n\n**Congratulations! You now have the foundational knowledge to link data and build powerful, dynamic workflows in n8n.**"
},
"typeVersion": 1
},
{
"id": "c3f2fd66-784d-4675-8cb3-72dd33e6ee4e",
"cid": "Ikx1Y2FzIFBleXJpbiI",
"name": "2. The n8n Selectors",
"type": "n8n-nodes-base.set",
"notes": "\u00a9 2025 Lucas Peyrin",
"creator": "Lucas Peyrin",
"position": [
-5568,
992
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "12345",
"name": "user_name_from_first",
"type": "string",
"value": "={{ $('Source Data').last().json.name }}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "bade9e22-6e9d-4f25-a1b7-974cbf2d5c61",
"cid": "Ikx1Y2FzIFBleXJpbiI",
"name": "Sticky Note9",
"type": "n8n-nodes-base.stickyNote",
"notes": "\u00a9 2025 Lucas Peyrin",
"creator": "Lucas Peyrin",
"position": [
-5872,
528
],
"parameters": {
"width": 680,
"height": 620,
"content": "## Lesson 2: The n8n Selectors (`.first()`, `.last()`, `.all()`)\n\nIn the last lesson, we used `.item`. When there is only one output item from a node, this is equivalent to `.last()`. Using `.last()` explicitly is often safer and clearer.\n\n**The Goal:** Get the user's name using the `.last()` selector.\n\n**The Expression:** `{{ $('Source Data').last().json.name }}`\n\n**Why is this better?**\nIf a node ever returns multiple items, `.last()` guarantees you only get data from the very last one.\n\nIf you ever need to match the selected data with the input items, this is where `.item` cannot be replaced.\n\n**Other Selectors:**\n- **`.first()`**: Gets the data from the first item.\n- **`.all()`**: Gets data from ALL items, returning it as an array of objects. (This is different from `$items`!)"
},
"typeVersion": 1
},
{
"id": "7c4b718e-fca8-4dbe-8b3b-d6aeeaa78d6d",
"cid": "Ikx1Y2FzIFBleXJpbiI",
"name": "7. Inspecting Objects",
"type": "n8n-nodes-base.set",
"notes": "\u00a9 2025 Lucas Peyrin",
"creator": "Lucas Peyrin",
"position": [
-2640,
992
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "12345",
"name": "contact_keys",
"type": "array",
"value": "={{ Object.keys($('Source Data').last().json.contact) }}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "089b02d1-e43b-4baf-8bcf-b2dd7a95df92",
"cid": "Ikx1Y2FzIFBleXJpbiI",
"name": "Sticky Note10",
"type": "n8n-nodes-base.stickyNote",
"notes": "\u00a9 2025 Lucas Peyrin",
"creator": "Lucas Peyrin",
"position": [
-2832,
640
],
"parameters": {
"color": 2,
"width": 500,
"height": 520,
"content": "## Lesson 7: Inspecting Objects (`Object.keys()`)\n\nWhat if you have an object but you don't know what keys are inside it? `Object.keys()` comes to the rescue.\n\n**The Goal:** Get a list of all the keys inside the `contact` object.\n\n**The Expression:** `{{ Object.keys($('Source Data').last().json.contact) }}`\n\nThis is incredibly useful for dynamically processing data. It returns an **array** containing the names of the keys (e.g., `[\"email\", \"phone\"]`)."
},
"typeVersion": 1
},
{
"id": "81a16f66-4fca-47af-841c-91e16ff9587e",
"cid": "Ikx1Y2FzIFBleXJpbiI",
"name": "8. Utility Functions",
"type": "n8n-nodes-base.set",
"notes": "\u00a9 2025 Lucas Peyrin",
"creator": "Lucas Peyrin",
"position": [
-2064,
992
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "12345",
"name": "contact_as_string",
"type": "string",
"value": "={{ JSON.stringify($('Source Data').last().json.contact, null, 2) }}"
},
{
"id": "06003b65-7482-4d5a-b2c0-1794859ab461",
"name": "skills",
"type": "array",
"value": "={{ $('Source Data').last().json.skills }}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "b7aea910-5fd6-420f-9814-77afb8ab9517",
"cid": "Ikx1Y2FzIFBleXJpbiI",
"name": "Sticky Note11",
"type": "n8n-nodes-base.stickyNote",
"notes": "\u00a9 2025 Lucas Peyrin",
"creator": "Lucas Peyrin",
"position": [
-2304,
640
],
"parameters": {
"width": 580,
"height": 520,
"content": "## Lesson 8: Utility Functions (`JSON.stringify()`)\n\nSometimes you need to convert a structured JSON object back into a clean, single string. This is common when sending data to another service, like in an AI prompt.\n\n**The Goal:** Turn the entire `contact` object into a formatted string.\n\n**The Expression:** `{{ JSON.stringify($('Source Data').last().json.contact, null, 2) }}`\n\n**Breakdown:**\n- **`JSON.stringify(...)`**: The function that does the conversion.\n- **`null, 2`**: These optional parameters tell it to \"pretty-print\" the string with an indentation of 2 spaces, making it readable."
},
"typeVersion": 1
},
{
"id": "2b83f9a2-7c71-43bb-b940-d0c3204cf6a2",
"cid": "Ikx1Y2FzIFBleXJpbiI",
"name": "Split Out Skills",
"type": "n8n-nodes-base.splitOut",
"notes": "\u00a9 2025 Lucas Peyrin",
"creator": "Lucas Peyrin",
"position": [
-1488,
992
],
"parameters": {
"include": "allOtherFields",
"options": {},
"fieldToSplitOut": "skills"
},
"typeVersion": 1
},
{
"id": "933a0592-2deb-4db7-b801-d52dbbed1252",
"cid": "Ikx1Y2FzIFBleXJpbiI",
"name": "Sticky Note12",
"type": "n8n-nodes-base.stickyNote",
"notes": "\u00a9 2025 Lucas Peyrin",
"creator": "Lucas Peyrin",
"position": [
-352,
-128
],
"parameters": {
"color": 3,
"width": 540,
"height": 1280,
"content": "## Was this helpful? Let me know!\n[](https://n8n.ac)\n\nI really hope this tutorial helped you understand n8n Expressions better. Your feedback is incredibly valuable and helps me create better resources for the n8n community.\n\n### **Share Your Thoughts & Ideas**\n\nWhether you have a suggestion, found a typo, or just want to say thanks, I'd love to hear from you!\nHere's a simple n8n form built for this purpose:\n\n#### \u27a1\ufe0f **[Click here to give feedback](https://api.ia2s.app/form/templates/feedback?template=Expressions%20Tutorial)**\n\n### **Ready to Build Something Great?**\n\nIf you're looking to take your n8n skills or business automation to the next level, I can help.\n\n**\ud83c\udf93 n8n Coaching:** Want to become an n8n pro? I offer one-on-one coaching sessions to help you master workflows, tackle specific problems, and build with confidence.\n#### \u27a1\ufe0f **[Book a Coaching Session](https://api.ia2s.app/form/templates/coaching?template=Expressions%20Tutorial)**\n\n**\ud83d\udcbc n8n Consulting:** Have a complex project, an integration challenge, or need a custom workflow built for your business? Let's work together to create a powerful automation solution.\n#### \u27a1\ufe0f **[Inquire About Consulting Services](https://api.ia2s.app/form/templates/consulting?template=Expressions%20Tutorial)**\n\n---\n\nHappy Automating!\nLucas Peyrin | [n8n Academy](https://n8n.ac)"
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"cid": "Ikx1Y2FzIFBleXJpbiI",
"name": "Sticky Note15",
"type": "n8n-nodes-base.stickyNote",
"notes": "\u00a9 2025 Lucas Peyrin",
"creator": "Lucas Peyrin",
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"parameters": {
"color": 6,
"width": 512,
"height": 408,
"content": "## [>> Go to Eval Workflow <<](https://n8n.io/workflows/6236)\n\nVerify your skills with a complete eval workflow to put your Expression Skills to the test.\n[](https://n8n.io/workflows/6236)"
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About this workflow
This template is an interactive, step-by-step tutorial designed to teach you the most important skill in n8n: using expressions to access and manipulate data.
Source: https://n8n.io/workflows/5271/ — original creator credit. Request a take-down →
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