Update a diagram
PUT
https://app.eraser.io/api/files/{fileId}/diagrams/{diagramId} 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"
}Path parameters
fileId string requiredpathID of the file containing the diagram
diagramId string requiredpathID of the diagram to update
Request body
code string requiredNew Eraser DSL code for the diagram
Responses
200 – The updated diagram
id string requiredUnique identifier for the diagram
diagramUrl string requiredURL to view the diagram in the Eraser canvas
diagramType string requiredType of the diagram
sequence-diagramentity-relationship-diagramcloud-architecture-diagramflowchart-diagrambpmn-diagram
code string requiredEraser DSL code for the diagram
updatedAt string requiredISO 8601 timestamp of when the diagram was last updated
{
"id": "string",
"diagramUrl": "https://app.eraser.io/workspace/abc123?diagram=def456&layout=canvas",
"diagramType": "sequence-diagram",
"code": "string",
"updatedAt": "2026-01-01T00:00:00Z"
}