> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://humanloop.com/docs/v5/api/datasets/upload-csv/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://humanloop.com/_mcp/server.

# Upload CSV

POST https://api.humanloop.com/v5/datasets/{id}/datapoints/csv
Content-Type: multipart/form-data

Add Datapoints from a CSV file to a Dataset.

This will create a new version of the Dataset with the Datapoints from the CSV file.

If either `version_id` or `environment` is provided, the new version will be based on the specified version,
with the Datapoints from the CSV file added to the existing Datapoints in the version.
If neither `version_id` nor `environment` is provided, the new version will be based on the version
of the Dataset that is deployed to the default Environment.

You can optionally provide a name and description for the new version using `version_name`
and `version_description` parameters.

Reference: https://humanloop.com/docs/api/datasets/upload-csv

## Authentication

- `X-API-KEY` header (required) — API Key authentication via header

## Request

### Path parameters

- `id` (string, required) — Unique identifier for the Dataset

### Query parameters

- `version_id` (string, optional) — ID of the specific Dataset version to base the created Version on.
- `environment` (string, optional) — Name of the Environment identifying a deployed Version to base the created Version on.

### Body (multipart/form-data)

This endpoint expects a multipart form containing a file.

- `file` (file, required) — A CSV file containing Datapoints to be added to the Dataset.
- `version_name` (string, optional) — Name for the new Dataset version.
- `version_description` (string, optional) — Description for the new Dataset version.

## Response

### 200

Successful Response

- `path` (string, required) — Path of the Dataset, including the name, which is used as a unique identifier.
- `id` (string, required) — Unique identifier for the Dataset. Starts with `ds_`.
- `name` (string, required) — Name of the Dataset, which is used as a unique identifier.
- `version_id` (string, required) — Unique identifier for the specific Dataset Version. If no query params provided, the default deployed Dataset Version is returned. Starts with `dsv_`.
- `created_at` (datetime, required)
- `updated_at` (datetime, required)
- `last_used_at` (datetime, required)
- `datapoints_count` (integer, required) — The number of Datapoints in this Dataset version.
- `directory_id` (string, optional) — ID of the directory that the file is in on Humanloop.
- `description` (string, optional) — Description of the Dataset.
- `schema` (map from string to any, optional) — The JSON schema for the File.
- `readme` (string, optional) — Long description of the file.
- `tags` (list of string, optional) — List of tags associated with the file.
- `type` ("dataset", optional)
- `environments` (list of EnvironmentResponse, optional) — The list of environments the Dataset Version is deployed to.
- `created_by` (any, optional) — The user who created the Dataset.
- `version_name` (string, optional) — Unique name for the Dataset version. Version names must be unique for a given Dataset.
- `version_description` (string, optional) — Description of the version, e.g., the changes made in this version.
- `datapoints` (list of DatapointResponse, optional) — The list of Datapoints in this Dataset version. Only provided if explicitly requested.
- `attributes` (map from string to any, optional) — Additional fields to describe the Dataset. Helpful to separate Dataset versions from each other with details on how they were created or used.

## Errors

### 422 Upload CSV Datasets ID Datapoints CSV Post Request Unprocessable Entity Error

Validation Error

- `detail` (list of ValidationError, optional)

## Types

### EnvironmentResponse

- `id` (string, required)
- `created_at` (datetime, required)
- `name` (string, required)
- `tag` (enum, required) — An enumeration.
  - Allowed values: `default`, `other`

### DatapointResponse

- `id` (string, required) — Unique identifier for the Datapoint. Starts with `dp_`.
- `inputs` (map from string to string, optional) — The inputs to the prompt template.
- `messages` (list of ChatMessage, optional) — List of chat messages to provide to the model.
- `target` (map from string to DatapointResponseTargetValue, optional) — Object with criteria necessary to evaluate generations with this Datapoint. This is passed in as an argument to Evaluators when used in an Evaluation.

### ValidationError

- `loc` (list of ValidationErrorLocItem, required)
- `msg` (string, required)
- `type` (string, required)

### ChatMessage

- `role` (enum, required) — Role of the message author.
  - Allowed values: `user`, `assistant`, `system`, `tool`, `developer`
- `content` (ChatMessageContent, optional) — The content of the message.
- `name` (string, optional) — Optional name of the message author.
- `tool_call_id` (string, optional) — Tool call that this message is responding to.
- `tool_calls` (list of ToolCall, optional) — A list of tool calls requested by the assistant.
- `thinking` (list of ChatMessageThinkingItem, optional) — Model's chain-of-thought for providing the response. Present on assistant messages if model supports it.

### DatapointResponseTargetValue

### ValidationErrorLocItem

### ChatMessageContent

The content of the message.

### ToolCall

A tool call to be made.

- `id` (string, required)
- `type` ("function", required) — The type of tool to call.
- `function` (FunctionTool, required) — A function tool to be called by the model where user owns runtime.

### ChatMessageThinkingItem

### FunctionTool

A function tool to be called by the model where user owns runtime.

- `name` (string, required)
- `arguments` (string, optional)

### AnthropicThinkingContent

- `type` ("thinking", required)
- `thinking` (string, required) — Model's chain-of-thought for providing the response.
- `signature` (string, required) — Cryptographic signature that verifies the thinking block was generated by Anthropic.

### AnthropicRedactedThinkingContent

- `type` ("redacted_thinking", required)
- `data` (string, required) — Thinking block Anthropic redacted for safety reasons. User is expected to pass the block back to Anthropic

## Examples

**Request**

```json
{
  "file": "<file: <file1>>"
}
```

**Response**

```json
{
  "path": "path",
  "id": "id",
  "name": "name",
  "version_id": "version_id",
  "created_at": "2024-01-15T09:30:00Z",
  "updated_at": "2024-01-15T09:30:00Z",
  "last_used_at": "2024-01-15T09:30:00Z",
  "datapoints_count": 1,
  "directory_id": "directory_id",
  "description": "description",
  "schema": {
    "key": "value"
  },
  "readme": "readme",
  "tags": [
    "tags"
  ],
  "type": "dataset",
  "environments": [
    {
      "id": "id",
      "created_at": "2024-01-15T09:30:00Z",
      "name": "name",
      "tag": "default"
    }
  ],
  "created_by": {
    "id": "id",
    "email_address": "email_address",
    "full_name": "full_name"
  },
  "version_name": "version_name",
  "version_description": "version_description",
  "datapoints": [
    {
      "id": "id",
      "inputs": {
        "key": "value"
      },
      "messages": [
        {
          "role": "user"
        }
      ],
      "target": {
        "key": "value"
      }
    }
  ],
  "attributes": {
    "key": "value"
  }
}
```

**SDK Code**

```python
import requests

url = "https://api.humanloop.com/v5/datasets/id/datapoints/csv"

files = { "file": "open('<file1>', 'rb')" }
payload = {
    "version_name": ,
    "version_description": 
}
headers = {"X-API-KEY": "<apiKey>"}

response = requests.post(url, data=payload, files=files, headers=headers)

print(response.json())
```

```typescript
import { HumanloopClient } from "humanloop";
import * as fs from "fs";

const client = new HumanloopClient({ apiKey: "YOUR_API_KEY" });
await client.datasets.uploadCsv(fs.createReadStream("/path/to/your/file"), "id", {});

```

```go
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.humanloop.com/v5/datasets/id/datapoints/csv"

	payload := strings.NewReader("-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"<file1>\"\r\nContent-Type: application/octet-stream\r\n\r\n\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"version_name\"\r\n\r\n\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"version_description\"\r\n\r\n\r\n-----011000010111000001101001--\r\n")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("X-API-KEY", "<apiKey>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
```

```ruby
require 'uri'
require 'net/http'

url = URI("https://api.humanloop.com/v5/datasets/id/datapoints/csv")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["X-API-KEY"] = '<apiKey>'
request.body = "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"<file1>\"\r\nContent-Type: application/octet-stream\r\n\r\n\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"version_name\"\r\n\r\n\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"version_description\"\r\n\r\n\r\n-----011000010111000001101001--\r\n"

response = http.request(request)
puts response.read_body
```

```java
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.post("https://api.humanloop.com/v5/datasets/id/datapoints/csv")
  .header("X-API-KEY", "<apiKey>")
  .body("-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"<file1>\"\r\nContent-Type: application/octet-stream\r\n\r\n\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"version_name\"\r\n\r\n\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"version_description\"\r\n\r\n\r\n-----011000010111000001101001--\r\n")
  .asString();
```

```php
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://api.humanloop.com/v5/datasets/id/datapoints/csv', [
  'multipart' => [
    [
        'name' => 'file',
        'filename' => '<file1>',
        'contents' => null
    ]
  ]
  'headers' => [
    'X-API-KEY' => '<apiKey>',
  ],
]);

echo $response->getBody();
```

```csharp
using RestSharp;

var client = new RestClient("https://api.humanloop.com/v5/datasets/id/datapoints/csv");
var request = new RestRequest(Method.POST);
request.AddHeader("X-API-KEY", "<apiKey>");
request.AddParameter("undefined", "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"<file1>\"\r\nContent-Type: application/octet-stream\r\n\r\n\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"version_name\"\r\n\r\n\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"version_description\"\r\n\r\n\r\n-----011000010111000001101001--\r\n", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = ["X-API-KEY": "<apiKey>"]
let parameters = [
  [
    "name": "file",
    "fileName": "<file1>"
  ],
  [
    "name": "version_name",
    "value": 
  ],
  [
    "name": "version_description",
    "value": 
  ]
]

let boundary = "---011000010111000001101001"

var body = ""
var error: NSError? = nil
for param in parameters {
  let paramName = param["name"]!
  body += "--\(boundary)\r\n"
  body += "Content-Disposition:form-data; name=\"\(paramName)\""
  if let filename = param["fileName"] {
    let contentType = param["content-type"]!
    let fileContent = String(contentsOfFile: filename, encoding: String.Encoding.utf8)
    if (error != nil) {
      print(error as Any)
    }
    body += "; filename=\"\(filename)\"\r\n"
    body += "Content-Type: \(contentType)\r\n\r\n"
    body += fileContent
  } else if let paramValue = param["value"] {
    body += "\r\n\r\n\(paramValue)"
  }
}

let request = NSMutableURLRequest(url: NSURL(string: "https://api.humanloop.com/v5/datasets/id/datapoints/csv")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```