n8n Expressions Tutorial

What are n8n expressions?

n8n expressions are JavaScript code snippets within {{ }} brackets

Syntax: {{ JavaScript expression }}

Importance of n8n expressions.

n8n expressions give you data access from anywhere in your workflow and allow real-time data manipulation.

You can’t use n8n if you don’t understand the n8n expressions. They are that important.

Examples of n8n expressions.

{{“Hello World”}}

{{ 2+3 }}

{{ true }}

{{ false }}

{{ [1,2,3] }}

{{ [“name”,”age”,22] }}

{{ [{“firstName”:”Himanshu”,”lastName”:”Sharma”}] }}

{{ $input.item.json.headers.host }}

{{ $json.headers.host }}

{{$node[“Webhook”].json}}

{{$now}}

We often use the n8n expression to traverse through a JSON object.

To traverse through a n8n JSON object use the . dot notation.

Access Top-Level Fields:

{{ $json.headers }}

Access Nested Fields:

{{ $json.body.call }}

Access Deeply Nested Field:

{{ $json.body.call.call_id }}

Use the . dot notation to access the n8n functions.

n8n provides one or more functions for each field.

For example:

You can access these functions by using the . dot notation directly in n8n expressions.

For example: {{ $json.body.call.call_id.base64Decode() }}

Understanding top-level items in an n8n object.