ERR_413 on Airtable: Request Entity Too Large / 413 Error. Root cause: Total incoming batch JSON weight exceeding 100KB per request threshold Step 1: Enforce Batch Limits. Limit your array updates to exactly 10 records per request (Airtable's maximum batch size constraint). Step 2: Sanitize Data Blocks. Strip base64 string assets out of the payload. Upload attachments to an external CDN (like AWS S3) first, and pass only the direct public URL string to Airtable. Step 3: Implement Chunking Logic. If using JavaScript or Python via Manus, use array slicing (payload.slice(0, 10)) to cycle and chunk your requests programmatically.