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Métiers associés SOC
Basé sur la classification professionnelle SOC
name n8n-expression-syntax description Validate n8n expression syntax and fix common errors. Use when writing n8n expressions, using {{}} syntax, accessing $json/$node variables, troubleshooting expression errors, or working with webhook d category Document Processing source antigravity tags ["javascript","node","api","mcp","ai","workflow","document"] url https://github.com/sickn33/antigravity-awesome-skills/tree/main/skills/n8n-expression-syntax
n8n Expression Syntax
Expert guide for writing correct n8n expressions in workflows.
When to Use
You need to write or debug n8n expressions using {{ ... }} syntax.
The task involves $json, $node, webhook payloads, or expression-related workflow errors.
You want syntax-correct dynamic values inside n8n nodes and parameters.
Expression Format
All dynamic content in n8n uses double curly braces :
✅ {{$json.email}}
✅ {{$json.body.name}}
✅ {{$node["HTTP Request"].json.data}}
❌ $json.email (no braces - treated as literal text)
❌ {$json.email} (single braces - invalid)
Core Variables
$json - Current Node Output Access data from the current node:
{{$json.fieldName }}
{{$json['field with spaces' ]}}
{{$json.nested .property }}
{{$json.items [0 ].name }}
$node - Reference Other Nodes Access data from any previous node:
{{$node["Node Name" ].json .fieldName }}
{{$node["HTTP Request" ].json .data }}
{{$node["Webhook" ].json .body .email }}
Node names must be in quotes
Node names are case-sensitive
Must match exact node name from workflow
$now - Current Timestamp Access current date/time:
{{$now}}
{{$now.toFormat ('yyyy-MM-dd' )}}
{{$now.toFormat ('HH:mm:ss' )}}
{{$now.plus ({days : 7 })}}
$env - Environment Variables Access environment variables:
{{$env.API_KEY }}
{{$env.DATABASE_URL }}
🚨 CRITICAL: Webhook Data Structure Most Common Mistake : Webhook data is NOT at the root!
Webhook Node Output Structure {
"headers" : {...},
"params" : {...},
"query" : {...},
"body" : {
"name" : "John" ,
"email" : "john@example.com" ,
"message" : "Hello"
}
}
Correct Webhook Data Access ❌ WRONG : {{$json.name }}
❌ WRONG : {{$json.email }}
✅ CORRECT : {{$json.body .name }}
✅ CORRECT : {{$json.body .email }}
✅ CORRECT : {{$json.body .message }}
Why : Webhook node wraps incoming data under .body property to preserve headers, params, and query parameters.
Common Patterns
Access Nested Fields
{{$json.user .email }}
{{$json.data [0 ].name }}
{{$json.items [0 ].id }}
{{$json['field name' ]}}
{{$json['user data' ]['first name' ]}}
Reference Other Nodes
{{$node["Set" ].json .value }}
{{$node["HTTP Request" ].json .data }}
{{$node["Respond to Webhook" ].json .message }}
{{$node["Webhook" ].json .body .email }}
Combine Variables
Hello {{$json.body .name }}!
https :
{
"name" : "={{$json.body.name}}" ,
"email" : "={{$json.body.email}}"
}
When NOT to Use Expressions
❌ Code Nodes Code nodes use direct JavaScript access , NOT expressions!
const email = '={{$json.email}}' ;
const name = '{{$json.body.name}}' ;
const email = $json.email ;
const name = $json.body .name ;
const email = $input.item .json .email ;
const allItems = $input.all ();
❌ Webhook Paths
path : "{{$json.user_id}}/webhook"
path : "user-webhook"
❌ Credential Fields
apiKey : "={{$env.API_KEY}}"
Use n8n credential system, not expressions
Validation Rules
1. Always Use {{}} Expressions must be wrapped in double curly braces.
❌ $json.field
✅ {{$json.field }}
2. Use Quotes for Spaces Field or node names with spaces require bracket notation :
❌ {{$json.field name}}
✅ {{$json['field name' ]}}
❌ {{$node.HTTP Request .json }}
✅ {{$node["HTTP Request" ].json }}
3. Match Exact Node Names Node references are case-sensitive :
❌ {{$node["http request" ].json }}
❌ {{$node["Http Request" ].json }}
✅ {{$node["HTTP Request" ].json }}
4. No Nested {{}} Don't double-wrap expressions:
❌ {{{$json.field }}}
✅ {{$json.field }}
Common Mistakes For complete error catalog with fixes, see COMMON_MISTAKES.md
Quick Fixes Mistake Fix $json.field{{$json.field}}{{$json.field name}}{{$json['field name']}}{{$node.HTTP Request}}{{$node["HTTP Request"]}}{{{$json.field}}}{{$json.field}}{{$json.name}} (webhook){{$json.body.name}}'={{$json.email}}' (Code node)$json.email
Working Examples For real workflow examples, see EXAMPLES.md
Example 1: Webhook to Slack {
"body" : {
"name" : "John Doe" ,
"email" :
