N8n Expression Syntax
by czlonkowski19cd793f4789No license6.3K starsListed Oct 8, 2026Updated Oct 8, 2026Repository updated 3 weeks ago
Validate n8n expression syntax and fix common errors. Use when writing n8n expressions, using {{}} syntax, accessing $json/$node variables, troubleshooting expression errors, mapping data between nodes, or referencing webhook data in workflows. Use this skill whenever configuring node fields that reference data from previous nodes — expressions are how n8n passes data between nodes, and getting the syntax wrong is the most common source of workflow errors. Also use when asked whether a complex expression hurts performance.
Add to a SourceWeft workspace
- Open the skill in your dashboard and add it to a workspace.
- Enable it for the chats that should use it.
This skill is instructions only: it ships no scripts to execute.
Add to SourceWeftYou will be asked to sign in first, then taken straight to this skill.
Ask your agent to install it
Paste this prompt into Claude Code, Codex, Cursor or another agent that can run commands — or into SourceWeft chat. The agent reads this skill's install guide, shows you its source, license and scripts, and installs it with the SourceWeft CLI once you agree.
Read https://sourceweft.com/skills/gh-czlonkowski-n8n-skills-n8n-expression-syntax/install.md and install the skill it describes. Before installing, show me its source, license and whether it ships scripts, and wait for my OK. Ask me before changing anything else on my machine.Install it yourself from a terminal
For Claude Code, Codex, Cursor and other local agents. The SourceWeft CLI fetches the skill from its source repository at the commit scanned here, and verifies every file against the hashes recorded when the skill was scanned. If anything differs, nothing is written.
npx @sourceweft/cli skills install gh-czlonkowski-n8n-skills-n8n-expression-syntaxAdd --agent claude-code, codex, cursor or universal to choose which agent gets it (Claude Code by default).
Upstream installer — not verified by SourceWeft
The open-source skills installer fetches the same pinned commit, but does not check the files against the hashes SourceWeft recorded.
npx skills add https://github.com/czlonkowski/n8n-skills/tree/19cd793f4789e3ef9c657ccf26e097f641a77df0/skills/n8n-expression-syntaxSource and attribution
Source:czlonkowski/n8n-skillsinskills/n8n-expression-syntaxat commit19cd793
License: No license
Content belongs to its original authors. SourceWeft indexes it from a public repository.
More from czlonkowski/n8n-skills
Using N8n Mcp Skills
czlonkowski
Routes n8n workflow tasks to specialist skills and documents the n8n-mcp tool surface.
N8n Validation Expert
czlonkowski
Guides interpretation and fixing of n8n workflow validation errors, warnings and false positives.
N8n Subworkflows
czlonkowski
Guides building reusable, composable n8n sub-workflows with typed inputs, clear contracts and correct call modes.
N8n Multi Instance
czlonkowski
Use when an n8n-mcp account targets more than one n8n instance — i.e. the `n8n_instances` tool is available, the user mentions multiple n8n instances or environments (prod vs staging, several teams or clients), a workflow / datatable / credential / execution call returns an unexpected NOT_FOUND or reads data you don't recognize, or a credential create/update/delete is refused with an `INSTANCE_AMBIGUOUS` error. Covers choosing and switching which instance this MCP session targets, verifying the target before high-stakes work — credential writes above all — and recovering from misroutes and ambiguous-write fail-closes. Always consult this skill before operating on a specific instance, before any credential create/update/delete on a multi-instance account, or when a call hits the wrong/empty data or an `INSTANCE_AMBIGUOUS` error.
N8n Mcp Tools Expert
czlonkowski
Guides an agent in correctly using n8n-mcp MCP tools to search nodes, validate configs, and manage n8n workflows.
N8n Error Handling
czlonkowski
Guides wiring n8n error handling so failures are loud, structured, and recoverable in webhook, API, and unattended workflows.
More in Software Development
Playground
anthropics
Builds self-contained interactive HTML playgrounds with controls, live preview, and copyable prompt output.
M5 Onboard
anthropics
Provisions M5Stack ESP32 boards by detecting them on USB, flashing UIFlow 2.0 firmware, and installing a MicroPython app bundle.
Cardputer Buddy
anthropics
Guides iterating on a Cardputer-Adv MicroPython app bundle: adding apps, pushing files over USB-serial, tailing logs, and running REPL commands.
Web Design Guidelines
vercel-labs
Reviews UI code against Web Interface Guidelines fetched from a remote source and reports findings as file:line entries.
Vercel React Native Skills
vercel-labs
React Native and Expo best-practice rules covering list performance, animation, navigation, UI patterns, state, and monorepo setup.
Vercel React Best Practices
vercel-labs
Vercel's React and Next.js performance guidelines, organized as 70 rules for writing, reviewing, and refactoring code.