Edit File Content

Change part of a text file in place, leaving the rest untouched. PUT on this path replaces the whole file; this is the partial counterpart. search_replace matches exact text and requires one match unless replaceAll is true. replace_between, insert_after, and delete_between match complete lines after trimming surrounding whitespace, so edits remain stable when unrelated changes move the target to another line. Anchored replacement preserves both boundary lines; insertion preserves its anchor; deletion removes the start anchor and preserves the end anchor. Use occurrence when an anchor line repeats. Only files whose stored bytes are UTF-8 text can be edited: a PDF or DOCX answers 400. A concurrent write answers 409, and retrying means re-reading first.

PATCH/api/v2/files/{fileId}/content

Authorization

apiKey
X-API-Key<token>

Your Sim API key, personal or workspace-scoped. Generate one under Settings, then API Keys. Operations that reject workspace keys say so in their own description.

In: header

Path Parameters

fileId*string

File identifier.

Match^[A-Za-z0-9_-]+$
Length1 <= length <= 128

Request Body

application/json

Workspace scope and the change to apply.

TypeScript Definitions

Use the request body type in TypeScript.

Response Body

application/json

application/json

application/json

application/json

application/json

application/json

application/json

application/json

application/json

application/json

application/json

application/json

curl -X PATCH "https://www.sim.ai/api/v2/files/string/content" \  -H "X-API-Key: YOUR_API_KEY" \  -H "Content-Type: application/json" \  -d '{    "workspaceId": "a91c4b2e-6d3f-4e8a-b5c7-0d9e2f1a8c64",    "edit": {      "mode": "search_replace",      "search": "- based in NYC",      "content": "- based in SF"    }  }'
{
  "data": {
    "file": {
      "id": "wf_V1StGXR8z5jdHi6BmyT91",
      "webUrl": "https://www.sim.ai/workspace/a91c4b2e-6d3f-4e8a-b5c7-0d9e2f1a8c64/files/wf_V1StGXR8z5jdHi6BmyT91",
      "name": "data.csv",
      "size": 1024,
      "type": "text/csv",
      "key": "workspace/example/data.csv",
      "folderPath": "/Engineering",
      "uploadedByEmail": "jane@example.com",
      "uploadedAt": "2026-01-15T10:30:00Z",
      "updatedAt": "2026-01-15T10:30:00Z",
      "deletedAt": null
    },
    "lineCount": 5
  }
}
{
  "error": {
    "code": "BAD_REQUEST",
    "message": "Invalid request"
  }
}
{
  "error": {
    "code": "UNAUTHORIZED",
    "message": "API key required"
  }
}
{
  "error": {
    "code": "FORBIDDEN",
    "message": "Insufficient workspace permissions",
    "details": {
      "code": "INSUFFICIENT_WORKSPACE_ROLE"
    }
  }
}
{
  "error": {
    "code": "NOT_FOUND",
    "message": "Not found"
  }
}
{
  "error": {
    "code": "CONFLICT",
    "message": "The request conflicts with the current resource state"
  }
}
{
  "error": {
    "code": "PAYLOAD_TOO_LARGE",
    "message": "Request body is too large"
  }
}
{
  "error": {
    "code": "UNSUPPORTED_MEDIA_TYPE",
    "message": "Request body must be sent as application/json"
  }
}
{
  "error": {
    "code": "LOCKED",
    "message": "The file or its search index is temporarily locked; retry the request"
  }
}
{
  "error": {
    "code": "RATE_LIMITED",
    "message": "API rate limit exceeded",
    "details": {
      "retryAfter": "2026-01-01T00:00:30.000Z"
    }
  }
}
{
  "error": {
    "code": "INTERNAL_ERROR",
    "message": "Internal server error"
  }
}
{
  "error": {
    "code": "SERVICE_UNAVAILABLE",
    "message": "Service temporarily unavailable"
  }
}
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