Claude Platform Docs

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FileMetadata files().upload(params, requestOptions = RequestOptions.none())
POST/v1/files

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Parameters
FileUploadParams params
Optional<String> workspaceId⁠Header parameter

Optional header to select the Workspace for this request. The value is a Workspace ID (for example, wrkspc_011CZkZaBF1tNoB5wlCeusgy).

Only needed for credentials that can act on more than one Workspace. A credential that belongs to a specific Workspace may omit it; if sent, it must match that Workspace.

String file

The file to upload. Only the final path component of the part's filename is kept; an absent or empty filename is replaced with unnamed plus the extension for the file's stored mime_type, when known.

formatbinary
Optional<Long> expiresInSeconds

Seconds from upload until the file expires and its bytes become permanently unavailable. Must be between 3600 (one hour) and 7776000 (ninety days).

minimum3600
maximum7776000
Returns
class FileMetadata { type = "file"; id; createdAt; /* 5 more */ }
JsonValue type = "file"

Object type.

For files, this is always "file".

String id

Unique object identifier.

The format and length of IDs may change over time.

LocalDateTime createdAt

RFC 3339 datetime string representing when the file was created.

formatdate-time
String filename

Original filename of the uploaded file.

minLength1
maxLength500
String mimeType

MIME type of the file.

minLength1
maxLength255
long sizeBytes

Size of the file in bytes.

minimum0
Optional<Boolean> downloadable

Whether the file can be downloaded.

Optional<LocalDateTime> expiresAt

RFC 3339 datetime string representing when the file will expire and become unavailable for download. Null if the file does not expire. For files uploaded with expires_in_seconds, this is the upload time plus that value.

formatdate-time
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package com.anthropic.example;

import com.anthropic.client.AnthropicClient;
import com.anthropic.client.okhttp.AnthropicOkHttpClient;
import com.anthropic.models.files.FileMetadata;
import com.anthropic.models.files.FileUploadParams;
import java.io.ByteArrayInputStream;

public final class Main {
    private Main() {}

    public static void main(String[] args) {
        AnthropicClient client = AnthropicOkHttpClient.fromEnv();

        FileUploadParams params = FileUploadParams.builder()
            .file(new ByteArrayInputStream("Example data".getBytes()))
            .build();
        FileMetadata fileMetadata = client.files().upload(params);
    }
}
Returns Examples
Response 200
{
  "id": "file_011CNha8iCJcU1wXNR6q4V8w",
  "created_at": "2025-04-15T18:37:24.100435Z",
  "filename": "document.pdf",
  "mime_type": "application/pdf",
  "size_bytes": 102400,
  "type": "file",
  "downloadable": false,
  "expires_at": "2025-05-15T18:37:24.100435Z"
}