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Lasso accepts a variety of file formats as source data for extraction. Upload files first, then reference them by ID when creating a table.

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Supported formats

FormatExtensionsNotes
PDF.pdfScanned and text-based PDFs are both supported.
Spreadsheets.xlsx, .xls, .csvEach sheet or file is parsed for product data.
Images.jpg, .png, .webpOCR extracts text from images.
Documents.docx, .docWord documents are parsed for content.

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Upload flow

1

Upload the file

Send the file as multipart/form-data to POST /v1/files. Maximum size is 1 GB.
2

Get the file ID

The response includes an id field. Store this for the next step.
3

Create a table

Pass the file ID in the file_ids array when creating a table.

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Example

const file = new File([buffer], "catalog.pdf", { type: "application/pdf" });
const uploaded = await client.files.upload(file, "catalog.pdf");

const table = await client.tables.create({
  schema_id: "schema_abc",
  name: "My Catalog",
  file_ids: [uploaded.id],
});

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Alternative sources

If you do not want to upload files, you can also provide:
  • URLs — Pass file_urls with publicly accessible URLs. Lasso downloads and processes them server-side.
  • Text — Pass source_text with raw text content for extraction.

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Managing files

Files can be listed and deleted through the Files API. Deleting a file does not affect tables that were already created from it.