Write files | Vercel REST API

APIs & SDKs

Write files

POSThttps://api.vercel.com/v2/sandboxes/sessions/{sessionId}/fs/write

Uploads and extracts files to a session's filesystem. Files must be uploaded as a gzipped tarball (.tar.gz) with the Content-Type header set to application/gzip. The tarball contents are extracted to the session's working directory, or to a custom directory specified via the x-cwd header.

https://api.vercel.com/v2/sandboxes/sessions/{sessionId}/fs/write

const response = await fetch('https://api.vercel.com/v2/sandboxes/sessions/sessionId/fs/write?teamId=string&slug=string', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_ACCESS_TOKEN',
    'Content-Type': 'application/json',
  },
});

const data = await response.json();
console.log(data);

Response

"value"

Authentication

AuthorizationbearerToken

Default authentication mechanism

Path parameters

sessionIdstringRequired

The unique identifier of the session to write files to.

Query parameters

teamIdstringOptional

The Team identifier to perform the request on behalf of.

slugstringOptional

The Team slug to perform the request on behalf of.

Header parameters

x-cwdstringOptional

The target directory where the tarball contents will be extracted. If not specified, files are extracted to the sandbox home directory.

Response

200The files were successfully written to the session.

Errors

400One of the provided values in the request query is invalid. One of the provided values in the headers is invalid

401The request is not authorized.

403You do not have permission to access this resource.

404Error

410Error

422Error

429Error

500Error

Cross-link map: Write files (/docs/rest-api/sandboxes/write-files)

From the Vercel docs graph (built 2026-10-13T05:35:52.211Z), spanning vercel.com docs + KB, nextjs.org, ai-sdk.dev, and other Vercel documentation sites. Full graph as JSON: https://vercel.com/docs/graph.json

Semantically closest pages

Read a file — POST /v2/sandboxes/sessions/{sessionId}/fs/read — Downloads the contents of a file from a session's filesystem. The file
write_session_files — Use write_session_files with Vercel MCP.
Write to command stdin — POST /v2/sandboxes/sessions/{sessionId}/cmd/{cmdId}/stdin — Writes data to the stdin of a running command, and optionall
Create a directory — POST /v2/sandboxes/sessions/{sessionId}/fs/mkdir — Creates a new directory in a session's filesystem. By default, parent
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Vercel REST API Reference — Interact programmatically with your Vercel account using the SDK or direct HTTP requests.

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Vercel REST API Reference — Interact programmatically with your Vercel account using the SDK or direct HTTP requests.

https://api.vercel.com/v2/sandboxes/sessions/{sessionId}/fs/write

const response = await fetch('https://api.vercel.com/v2/sandboxes/sessions/sessionId/fs/write?teamId=string&slug=string', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_ACCESS_TOKEN',
    'Content-Type': 'application/json',
  },
});

const data = await response.json();
console.log(data);

Response

"value"

OpenAPI Specification