n8n-io/n8n · error

SET_INVALID_ASSIGNMENT

SET_INVALID_ASSIGNMENT

Error message

${nodeRef} has invalid assignments. Expected parameters.assignments to be an object containing assignments: [].

What it means

Fires in validateNode when parameters.assignments exists but is not a plain object. In manual mode the Set node expects assignments to be an object wrapping an array ({ assignments: [...] }); a string, array, or other non-object value at parameters.assignments is the input at fault. This is a generic validation guard, not a runtime failure. Skipped entirely when assignments is undefined or the node version is below MIN_ASSIGNMENT_VERSION.

Solutions

1. Structure the config as parameters.assignments = { assignments: [ { name, value, type } ] }
2. Remove parameters.assignments entirely if the node is not in manual mode and you do not intend to map fields
3. Verify the node version supports assignments (version >= MIN_ASSIGNMENT_VERSION)

When it happens

Trigger: Thrown at packages/@n8n/workflow-sdk/src/workflow-builder/plugins/validators/set-node-validator.ts:111 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of n8n-io/n8n@5ac6606e81 (2026-08-12). Data as JSON: /api/errors/cf3236601ac5365f. Report an issue: GitHub.

Appendix: source

Thrown at packages/@n8n/workflow-sdk/src/workflow-builder/plugins/validators/set-node-validator.ts:111

				violationLevel: 'major',
				nodeName: displayName,
				parameterPath: 'parameters.mode',
				originalName: origForWarning,
			});
		}

		if (nodeVersion < MIN_ASSIGNMENT_VERSION) {
			return issues;
		}

		const assignments = params.assignments;
		if (assignments === undefined) {
			return issues;
		}

		if (!isRecord(assignments)) {
			issues.push({
				code: 'SET_INVALID_ASSIGNMENT',
				message: `${nodeRef} has invalid assignments. Expected parameters.assignments to be an object containing assignments: [].`,
				severity: 'error',
				violationLevel: 'major',
				nodeName: displayName,
				parameterPath: 'parameters.assignments',
				originalName: origForWarning,
			});
			return issues;
		}

		const assignmentItems = assignments.assignments;

		if (assignmentItems === undefined) {
			return issues;
		}

		if (!Array.isArray(assignmentItems)) {
			issues.push({

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