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PATCH
/
knowledge
/
{folderId}
Update a file in a knowledge folder
curl --request PATCH \
  --url https://api.langdock.com/knowledge/{folderId} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form file='@example-file' \
  --form 'url=<string>' \
  --form 'attachmentId=<string>'
Using our API via a dedicated deployment? Just replace api.langdock.com with your deployment’s base URL: <deployment-url>/api/public
Updates an existing file (attachment) in a knowledge folder by replacing it with a new version. The old file is removed and the new file is processed and embedded.
Requires an API key with the KNOWLEDGE_FOLDER_API scope. The knowledge folder must be shared with the API key. See Share Knowledge Folders with the API for setup instructions.

​
Request Format

This endpoint accepts multipart/form-data requests with the file attached.

​
Path Parameters

ParameterTypeRequiredDescription
folderIdstringYesThe ID of the knowledge folder

​
Form Fields

FieldTypeRequiredDescription
attachmentIdstringYesThe ID of the attachment to update
filefileYesThe new file to upload (max 256MB)
urlstringNoURL shown to users when this file is used in an answer

​
Examples

​
Update with cURL

curl -X PATCH "https://api.langdock.com/knowledge/{folderId}" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -F "attachmentId=att_abc123def456" \
  -F "file=@/path/to/new-document.pdf"

​
Update with JavaScript

const FormData = require("form-data");
const fs = require("fs");
const axios = require("axios");

async function updateAttachment(folderId, attachmentId, filePath) {
  const form = new FormData();
  form.append("attachmentId", attachmentId);
  form.append("file", fs.createReadStream(filePath));

  const response = await axios.patch(
    `https://api.langdock.com/knowledge/${folderId}`,
    form,
    {
      headers: {
        Authorization: "Bearer YOUR_API_KEY",
        ...form.getHeaders(),
      },
    }
  );

  return response.data;
}

// Example usage
try {
  const result = await updateAttachment(
    "folder_abc123",
    "att_xyz789",
    "/path/to/updated-report.pdf"
  );
  console.log("Attachment updated:", result);
} catch (error) {
  console.error("Failed to update:", error.response?.data?.message);
}

​
Update with Source URL

const FormData = require("form-data");
const fs = require("fs");
const axios = require("axios");

async function updateAttachmentWithUrl(folderId, attachmentId, filePath, sourceUrl) {
  const form = new FormData();
  form.append("attachmentId", attachmentId);
  form.append("file", fs.createReadStream(filePath));
  form.append("url", sourceUrl);

  const response = await axios.patch(
    `https://api.langdock.com/knowledge/${folderId}`,
    form,
    {
      headers: {
        Authorization: "Bearer YOUR_API_KEY",
        ...form.getHeaders(),
      },
    }
  );

  return response.data;
}

​
Response Format

​
Success Response (200 OK)

{
  status: "success";
  result: {
    id: string;          // Unique attachment ID
    name: string;        // Original filename
    mimeType: string;    // MIME type of the file
    createdAt: string;   // ISO 8601 timestamp
    updatedAt: string;   // ISO 8601 timestamp
    url: string | null;  // Source URL if provided
  };
}

​
Example Response

{
  "status": "success",
  "result": {
    "id": "att_abc123def456",
    "name": "updated-report.pdf",
    "mimeType": "application/pdf",
    "createdAt": "2025-01-15T10:30:00.000Z",
    "updatedAt": "2025-01-20T14:45:00.000Z",
    "url": null
  }
}

​
Error Handling

try {
  const response = await updateAttachment(folderId, attachmentId, filePath);
} catch (error) {
  if (error.response) {
    switch (error.response.status) {
      case 400:
        console.error("Invalid request:", error.response.data.message);
        // Possible causes: missing attachmentId, missing file, unsupported file type
        break;
      case 401:
        console.error("Invalid or missing API key");
        break;
      case 403:
        console.error("API key does not have access to this knowledge folder");
        break;
      case 404:
        console.error("Knowledge folder or attachment not found");
        break;
      case 408:
        console.error("Upload request timed out");
        break;
      case 413:
        console.error("File size exceeds 256MB limit");
        break;
      case 429:
        console.error("Rate limit exceeded");
        break;
      case 500:
        console.error("Server error");
        break;
    }
  }
}

​
Processing Status

After updating, the new file is processed asynchronously. Use the Retrieve Files endpoint to check processing status. The syncStatus field indicates the current state:
  • UPLOADING - File is being uploaded
  • UPLOADED - File is uploaded and queued for processing
  • EXTRACTING - Text is being extracted from the file
  • EMBEDDING - Embeddings are being generated
  • SYNCED - File is ready for search
  • ACTION_FAILED, EXTRACTION_FAILED, EMBEDDING_FAILED, TIMEOUT - Processing failed
Langdock intentionally blocks browser-origin requests to protect your API key and ensure your applications remain secure. For more information, please see our guide on API Key Best Practices.

Authorizations

​
Authorization
string
header
required

API key as Bearer token. Format "Bearer YOUR_API_KEY"

Path Parameters

​
folderId
string
required

The ID of the knowledge folder

Body

multipart/form-data
​
file
file

The new file to upload

​
url
string

URL that is shown to the user if the file is used in an answer

​
attachmentId
string

The ID of the attachment to update

Response

200

Attachment updated successfully