Example request

curl --location --request PUT 'https://app.eraser.io/api/files/abc123/diagrams/diag1' \
--header 'Content-Type: application/json' \
--header 'Authorization: Bearer $YOUR-TOKEN-HERE' \
--data '{
    "code": "A > C: Updated"
}'

Example response

{
  "id": "diag1",
  "diagramUrl": "https://app.eraser.io/workspace/abc123?diagram=diag1&layout=canvas",
  "diagramType": "sequence-diagram",
  "code": "A > C: Updated",
  "updatedAt": "2025-07-15T10:00:00.000Z"
}