n8n-expression-syntax SKILL.md skillA
n8n-expression-syntax from hybridlabor-api/bdb-dev-optimized-agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add hybridlabor-api/bdb-dev-optimized-agent-skills/n8n-expression-syntax@git:20260827.e9312a3Pins git:20260827.e9312a3 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- hybridlabor-api/bdb-dev-optimized-agent-skills
- Path
skills/global_config/n8n-expression-syntax/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260827.e9312a3, committed Aug 27, 2026
- First version recorded
- Jul 27, 2026
- Size
- 10,151 bytes
- Repository stars
- 7
- License
- Apache-2.0
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 data in workflows.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# 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**:
```
{{expression}}
```
**Examples**:
```
✅ {{$json.email}}
✅ {{$json.body.name}}
✅ {{$node["HTTP Request"].json.data}}
❌ $json.email (no braces - treated as literal text)
❌ {$json.email} (single braces - invalid)
```
---
## Core Variables
### $json - Current Node Output
Access data from the current node:
```javascript
{{$json.fieldName}}
{{$json['field with spaces']}}
{{$json.nested.property}}
{{$json.items[0].name}}
```
### $node - Reference Other Nodes
Access data from any previous node:
```javascript
{{$node["Node Name"].json.fieldName}}
{{$node["HTTP Request"].json.data}}
{{$node["Webhook"].json.body.email}}
```
**Important**:
- Node names **must** be in quotes
- Node names are **case-sensitive**
- Must match exact node name from workflow
…Read the whole file at its exact version.
How to install
mdr add hybridlabor-api/bdb-dev-optimized-agent-skills/n8n-expression-syntax@sha256:d6d1dcc7ce828a07The line at the top of this page pins the label git:20260827.e9312a3, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_jdrdd2rfrzxmf5vu)
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Versions
The registry has recorded 2 versions of this file, between Jul 27, 2026 and Aug 27, 2026, about one every 31 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260827.e9312a3 latest | 2026-08-27 | e9312a3 | 10,151 B | A | view · diff |
| git:20260727.48beb34 | 2026-07-27 | 48beb34 | 10,133 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (10151 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
hybridlabor-api/bdb-dev-optimized-agent-skills · 7 stars · license Apache-2.0 · pushed 2026-11-05 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_jdrdd2rfrzxmf5vu GET https://markdownregistry.com/api/v1/resolve?ref=hybridlabor-api/bdb-dev-optimized-agent-skills/n8n-expression-syntax GET https://markdownregistry.com/api/v1/blob/d6d1dcc7ce828a0715a9b0de3c5ac27021a3dd2602faeffc67b972d8180d0e43
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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