---
title: "Upload a sandbox file"
method: POST
path: "/api/v2/sandboxes/{sandbox_id}/upload"
tags: ["sandboxes"]
---

# Upload a sandbox file

`POST /api/v2/sandboxes/{sandbox_id}/upload`

## Request

- Base URL: `https://api.smith.langchain.com`
- URL: `https://api.smith.langchain.com/api/v2/sandboxes/{sandbox_id}/upload`
- Auth: one of:
  - API key in header `X-API-Key`
  - API key in header `X-Tenant-Id`
  - HTTP bearer

Upload a file to a sandbox filesystem path.

## Path parameters

- `sandbox_id` string, required

## Query parameters

- `path` string, required

## Request body `multipart/form-data`

- object
  - `file` string, binary, required: File to upload

## Response `200`

OK

- SandboxesUploadResponse
  - `path` string
  - `written` integer

## Other responses

- `400`: Bad Request
- `403`: Forbidden
- `404`: Not Found
- `500`: Internal Server Error

## Changes

- **2026-10-16** `1a8ee9358d81`: 1 info
  - endpoint added

[Operation history](https://skmtc.dev/langchain-ai/apis/langsmith/changes/api/v2/sandboxes/:sandbox_id/upload/post.md)

---

[API](https://skmtc.dev/langchain-ai/apis/langsmith.md) - [All operations](https://skmtc.dev/langchain-ai/apis/langsmith/llms.txt) - [OpenAPI document](https://skmtc.dev/langchain-ai/apis/langsmith/revisions/7a01c01f75e8?raw)