Stop and Error

Unconditionally fails the flow with a configured error code and message — catchable by an enclosing Try, otherwise it fails the run.

Finding it in the library

Search the builder's node library for Stop and Error (it lives under Error Handling). A single click opens the in-editor docs panel shown here — description, ports, and every property, without leaving the canvas. Double-click (or drag) to add it to the workflow.

Wired up in the builder

Stop and Error in a real, runnable flow — captured live from the Studio editor, exactly as it looks on your canvas. This is the same workflow used for the example input & output below.

How it’s configured

The node’s settings as the builder shows them — every field laid out with real values. In the Studio these are edited on the node: click the chevron on the divider under its ports to open them.

Ports

Ports are the node’s contract with its neighbours. In the editor a port label renders bold when wired and italic when optional; ◈ ports accept attachment carriers rather than data wires.

How data flows through it

Stop and Error consumes the content of the incoming envelope — when it is fed directly by a trigger, the trigger’s wrapper is unwrapped at the node boundary so the node sees the actual data, not the metadata shell. Its output becomes the payload for the next node, while the envelope (trace ids, correlation, binary refs) rides along untouched. In the Runs view you always see the whole envelope for both sides of this node.

Expressions in the config

String-typed properties accept {{ }} expressions evaluated against the incoming item at run time — e.g. {{ $json.customer.email }}. On this node that’s message, errorCode. JSON- and code-typed fields never interpolate — they are passed through literally.

Build it with AI

Every node in this reference is reachable through Flowdrome’s AI Copilot and the MCP tools — say what you want, and the graph surgery happens server-side. Node types resolve fuzzily, so the catalog label (Stop and Error) works as well as the exact type id (error-handling.stop-and-error).

In the Copilot panel (or any connected AI):

add a stop and error node after the trigger

As a step in a create_chain_workflow call:

{"type":"Stop and Error","config":{}}

curl -s -X POST http://localhost:4800/mcp -H "content-type: application/json" -d '{ "jsonrpc": "2.0", "id": "1", "method": "tools/call", "params": { "name": "add_node", "arguments": { "workflowId": "<id>", "type": "Stop and Error" } } }'

Example input & output

Captured from a real test run of the workflow above — this is what the Runs view shows after pressing Test workflow. This particular run fails by design (see the note below).

This run fails BY DESIGN — Stop and Error exists to raise a designed failure, so the example shows the raised error instead of an output.

Input — what the node received

Output — what the node produced

This step raised: smoke boom

Property reference

Every setting, with its type and default — the same fields shown configured above.

Related nodes

The rest of the Error Handling group — the same folder you’d scan in the editor’s library.

• Try Wrap nodes in an error-handling boundary: catch any failure, retry, and route success/error.
• Error Trigger Fires when any node in the run fails unhandled — runs its downstream branch as a recovery phase of the same (s

This page is generated from the node registry by gen-node-docs.mjs on every site build — ports, properties, defaults and visibility rules cannot drift from the code. The screenshots and example data are captured from a live Flowdrome by npm run shots:nodes and npm run gen:examples.