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Write content to a file in the sandbox. Creates the file if it doesn’t exist, or overwrites if it does. Only allowed paths can be written.

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Endpoint

POST /files/write

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Request

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Headers

Authorization: Bearer YOUR_JWT_TOKEN
Content-Type: application/json

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Body Parameters

ParameterTypeRequiredDescription
pathstringYesDestination file path
contentstringYesFile content to write

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Example Request

curl -X POST https://sandbox_abc123xyz.hopx.dev/files/write \
  -H "Authorization: Bearer YOUR_JWT_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "path": "/workspace/data.txt",
    "content": "Hello World\nLine 2\nLine 3"
  }'
Write JSON file: 
curl -X POST https://sandbox_abc123xyz.hopx.dev/files/write \
  -H "Authorization: Bearer YOUR_JWT_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "path": "/workspace/config.json",
    "content": "{\"api_key\": \"test\", \"timeout\": 30}"
  }'

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Response

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Success (200 OK)

{
  "path": "/workspace/data.txt",
  "size": 30,
  "message": "File written successfully"
}

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Response Fields

FieldTypeDescription
pathstringFile path
sizeintegerFile size in bytes
messagestringConfirmation message

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Status Codes

CodeDescription
200File written successfully
400Invalid request (missing path or content)
401Unauthorized
403Path not allowed
500Write failed

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Errors

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Path Not Allowed (403)

{
  "error": "Path not allowed: /etc/config",
  "code": "FORBIDDEN"
}
Cause: The path is outside allowed directories. Fix: Only write files to /workspace, /tmp, or other explicitly allowed paths.

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Use Cases

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Write Configuration

curl -X POST https://sandbox_abc123xyz.hopx.dev/files/write \
  -H "Authorization: Bearer YOUR_JWT_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "path": "/workspace/app_config.json",
    "content": "{\"database\": \"postgres://localhost/mydb\", \"port\": 5000}"
  }'

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Write Python Script

curl -X POST https://sandbox_abc123xyz.hopx.dev/files/write \
  -H "Authorization: Bearer YOUR_JWT_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "path": "/workspace/script.py",
    "content": "import pandas as pd\n\ndf = pd.DataFrame({\"a\": [1,2,3]})\nprint(df)\n"
  }'

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Write CSV Data

curl -X POST https://sandbox_abc123xyz.hopx.dev/files/write \
  -H "Authorization: Bearer YOUR_JWT_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "path": "/workspace/data.csv",
    "content": "Name,Age,City\nAlice,25,NYC\nBob,30,LA\nCharlie,35,SF\n"
  }'

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Write and Execute

#!/bin/bash
# Write script
curl -X POST https://sandbox_abc123xyz.hopx.dev/files/write \
  -H "Authorization: Bearer YOUR_JWT_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "path": "/workspace/hello.py",
    "content": "print(\"Hello from HopX!\")"
  }'

# Execute it
curl -X POST https://sandbox_abc123xyz.hopx.dev/execute \
  -H "Authorization: Bearer YOUR_JWT_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "code": "exec(open(\"/workspace/hello.py\").read())",
    "language": "python"
  }'

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Write from Python

import requests
import json

url = "https://sandbox_abc123xyz.hopx.dev/files/write"
headers = {"Authorization": "Bearer YOUR_JWT_TOKEN"}

# Prepare data
data = {
    "users": [
        {"name": "Alice", "age": 25},
        {"name": "Bob", "age": 30}
    ]
}

payload = {
    "path": "/workspace/users.json",
    "content": json.dumps(data, indent=2)
}

response = requests.post(url, headers=headers, json=payload)
print(f"Wrote {response.json()['size']} bytes")

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Next Steps