Unsupported format for "${attachment.fileName}" (${attachmen

Error message

Unsupported format for "${attachment.fileName}" (${attachment.mimeType}). Supported: csv, tsv, json, xlsx, text, markdown, html, pdf, docx

What it means

Error "Unsupported format for "${attachment.fileName}" (${attachment.mimeType}). Supported: csv, tsv, json, xlsx, text, markdown, html, pdf, docx" thrown in n8n-io/n8n.

Source

Thrown at packages/@n8n/instance-ai/src/tools/attachments/parse-file.tool.ts:266

							format,
							...emptyTabularFields(),
							content: extracted.text,
							pages: extracted.pages,
							truncated: extracted.truncated,
						};
					}
					case 'docx': {
						const extracted = await extractDocxText(attachment);
						return {
							...commonOutput,
							format,
							...emptyTabularFields(),
							content: extracted.text,
							truncated: extracted.truncated,
						};
					}
					default:
						throw new Error(
							`Unsupported format for "${attachment.fileName}" (${attachment.mimeType}). Supported: csv, tsv, json, xlsx, text, markdown, html, pdf, docx`,
						);
				}
			} catch (parseError) {
				return {
					attachmentIndex: input.attachmentIndex,
					fileName: attachment.fileName,
					mimeType: attachment.mimeType,
					format: errorFormatFor(input.format, attachment),
					...emptyTabularFields(),
					truncated: false,
					error: parseError instanceof Error ? parseError.message : 'Unknown parsing error',
				};
			}
		})
		.build();
}

View on GitHub (pinned to 5ac6606e81)

When it happens

Trigger: Thrown at packages/@n8n/instance-ai/src/tools/attachments/parse-file.tool.ts:266 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/25a81f2c553d5a6e. Report an issue: GitHub.