> ## Documentation Index
> Fetch the complete documentation index at: https://docs.autosend.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Create Event

> Creates a new event definition under the project.

<Note>
  Defines a new event for the project. Event names and property names accept ASCII letters, digits, and underscores only, and must be 64 characters or fewer.
</Note>

<RequestExample>
  ```bash cURL theme={null}
  curl --request POST \
    --url https://api.autosend.com/v1/events \
    --header 'Authorization: Bearer AS_your-project-api-key' \
    --header 'Content-Type: application/json' \
    --data '{
    "eventName": "order_completed",
    "description": "Fired when a customer completes a checkout",
    "properties": [
      { "propertyName": "order_total", "type": "number", "description": "Total order value in USD" },
      { "propertyName": "currency", "type": "string", "suggestedValues": ["USD", "EUR", "GBP"] },
      { "propertyName": "is_first_purchase", "type": "boolean" }
    ]
  }'
  ```

  ```python Python theme={null}
  import requests

  url = "https://api.autosend.com/v1/events"

  headers = {
      "Authorization": "Bearer AS_your-project-api-key",
      "Content-Type": "application/json"
  }

  payload = {
      "eventName": "order_completed",
      "description": "Fired when a customer completes a checkout",
      "properties": [
          {"propertyName": "order_total", "type": "number", "description": "Total order value in USD"},
          {"propertyName": "currency", "type": "string", "suggestedValues": ["USD", "EUR", "GBP"]},
          {"propertyName": "is_first_purchase", "type": "boolean"}
      ]
  }

  response = requests.post(url, json=payload, headers=headers)
  print(response.json())
  ```

  ```javascript JavaScript theme={null}
  fetch('https://api.autosend.com/v1/events', {
    method: 'POST',
    headers: {
      'Authorization': 'Bearer AS_your-project-api-key',
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({
      eventName: 'order_completed',
      description: 'Fired when a customer completes a checkout',
      properties: [
        { propertyName: 'order_total', type: 'number', description: 'Total order value in USD' },
        { propertyName: 'currency', type: 'string', suggestedValues: ['USD', 'EUR', 'GBP'] },
        { propertyName: 'is_first_purchase', type: 'boolean' }
      ]
    })
  })
    .then(response => response.json())
    .then(data => console.log(data))
    .catch(error => console.error('Error:', error));
  ```

  ```php PHP theme={null}
  <?php

  $url = 'https://api.autosend.com/v1/events';

  $data = [
      'eventName' => 'order_completed',
      'description' => 'Fired when a customer completes a checkout',
      'properties' => [
          ['propertyName' => 'order_total', 'type' => 'number', 'description' => 'Total order value in USD'],
          ['propertyName' => 'currency', 'type' => 'string', 'suggestedValues' => ['USD', 'EUR', 'GBP']],
          ['propertyName' => 'is_first_purchase', 'type' => 'boolean']
      ]
  ];

  $ch = curl_init($url);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($ch, CURLOPT_POST, true);
  curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($data));
  curl_setopt($ch, CURLOPT_HTTPHEADER, [
      'Authorization: Bearer AS_your-project-api-key',
      'Content-Type: application/json'
  ]);

  $response = curl_exec($ch);
  curl_close($ch);

  echo $response;
  ?>
  ```

  ```go Go theme={null}
  package main

  import (
      "bytes"
      "encoding/json"
      "fmt"
      "io"
      "net/http"
  )

  func main() {
      url := "https://api.autosend.com/v1/events"

      payload := map[string]interface{}{
          "eventName":   "order_completed",
          "description": "Fired when a customer completes a checkout",
          "properties": []map[string]interface{}{
              {"propertyName": "order_total", "type": "number", "description": "Total order value in USD"},
              {"propertyName": "currency", "type": "string", "suggestedValues": []string{"USD", "EUR", "GBP"}},
              {"propertyName": "is_first_purchase", "type": "boolean"},
          },
      }

      jsonData, _ := json.Marshal(payload)

      req, _ := http.NewRequest("POST", url, bytes.NewBuffer(jsonData))
      req.Header.Set("Authorization", "Bearer AS_your-project-api-key")
      req.Header.Set("Content-Type", "application/json")

      client := &http.Client{}
      resp, err := client.Do(req)
      if err != nil {
          fmt.Println("Error:", err)
          return
      }
      defer resp.Body.Close()

      body, _ := io.ReadAll(resp.Body)
      fmt.Println(string(body))
  }
  ```

  ```java Java theme={null}
  import java.io.OutputStream;
  import java.net.HttpURLConnection;
  import java.net.URL;
  import java.nio.charset.StandardCharsets;

  public class CreateEvent {
      public static void main(String[] args) {
          try {
              URL url = new URL("https://api.autosend.com/v1/events");
              HttpURLConnection con = (HttpURLConnection) url.openConnection();

              con.setRequestMethod("POST");
              con.setRequestProperty("Authorization", "Bearer AS_your-project-api-key");
              con.setRequestProperty("Content-Type", "application/json");
              con.setDoOutput(true);

              String jsonInputString = "{\n" +
                  "  \"eventName\": \"order_completed\",\n" +
                  "  \"description\": \"Fired when a customer completes a checkout\",\n" +
                  "  \"properties\": [\n" +
                  "    { \"propertyName\": \"order_total\", \"type\": \"number\" },\n" +
                  "    { \"propertyName\": \"currency\", \"type\": \"string\" }\n" +
                  "  ]\n" +
                  "}";

              try (OutputStream os = con.getOutputStream()) {
                  byte[] input = jsonInputString.getBytes(StandardCharsets.UTF_8);
                  os.write(input, 0, input.length);
              }

              int status = con.getResponseCode();
              System.out.println("Response Status: " + status);

          } catch (Exception e) {
              e.printStackTrace();
          }
      }
  }
  ```

  ```ruby Ruby theme={null}
  require 'net/http'
  require 'json'
  require 'uri'

  uri = URI('https://api.autosend.com/v1/events')

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

  request = Net::HTTP::Post.new(uri.path)
  request['Authorization'] = 'Bearer AS_your-project-api-key'
  request['Content-Type'] = 'application/json'

  request.body = {
    eventName: 'order_completed',
    description: 'Fired when a customer completes a checkout',
    properties: [
      { propertyName: 'order_total', type: 'number' },
      { propertyName: 'currency', type: 'string', suggestedValues: ['USD', 'EUR', 'GBP'] },
      { propertyName: 'is_first_purchase', type: 'boolean' }
    ]
  }.to_json

  response = http.request(request)
  puts response.body
  ```
</RequestExample>

<ResponseExample>
  ```json 201 Response theme={null}
  {
    "success": true,
    "data": {
      "id": "60d5ec49f1b2c72d9c8b1234",
      "eventName": "order_completed",
      "description": "Fired when a customer completes a checkout",
      "properties": [
        {
          "propertyName": "order_total",
          "type": "number",
          "description": "Total order value in USD",
          "suggestedValues": []
        },
        {
          "propertyName": "currency",
          "type": "string",
          "suggestedValues": ["USD", "EUR", "GBP"]
        },
        {
          "propertyName": "is_first_purchase",
          "type": "boolean",
          "suggestedValues": []
        }
      ],
      "projectId": "229f1f77bcf86cd9273048038",
      "createdAt": "2026-05-08T10:00:00.000Z",
      "updatedAt": "2026-05-08T10:00:00.000Z"
    }
  }
  ```
</ResponseExample>

***

#### Authorizations

<ParamField path="Authorizations" type="string | header" required>
  Project API key header of the form Bearer `AS_<key>`.
</ParamField>

### Body

<ParamField path="eventName" type="string" required>
  Unique name of the event within the project. ASCII letters, digits, and underscores only.

  Maximum length: `64`

  Example: `"order_completed"`
</ParamField>

<ParamField path="description" type="string">
  Optional human-readable description.

  Example: `"Fired when a customer completes a checkout"`
</ParamField>

<ParamField path="properties" type="object[]">
  Schema for the event's custom properties. Up to 50 properties per event.

  <Expandable title="property attributes">
    <ParamField path="propertyName" type="string" required>
      Property identifier. ASCII letters, digits, and underscores only. Must be unique within the event.

      Maximum length: `64`

      Example: `"order_total"`
    </ParamField>

    <ParamField path="type" type="string" required>
      Declared type for the property value. One of `string`, `number`, `date`, or `boolean`.

      Example: `"number"`
    </ParamField>

    <ParamField path="description" type="string">
      Optional human-readable description of the property.
    </ParamField>

    <ParamField path="suggestedValues" type="array | string">
      Optional list of suggested values shown in the UI. Accepts an array, or a comma-separated string. Each value is coerced to the declared `type`.

      Example: `["USD", "EUR", "GBP"]`
    </ParamField>
  </Expandable>
</ParamField>

#### Response

<span className="text-sm">Event created successfully (201)</span>

<ResponseField name="success" type="boolean">
  Indicates if the request was successful

  Example: `true`
</ResponseField>

<ResponseField name="data" type="object">
  The created event definition

  <Expandable title="child attributes">
    <ResponseField name="data.id" type="string">
      Unique event definition identifier
    </ResponseField>

    <ResponseField name="data.eventName" type="string">
      Event name as supplied at creation
    </ResponseField>

    <ResponseField name="data.description" type="string | null">
      Human-readable description, or `null`
    </ResponseField>

    <ResponseField name="data.properties" type="object[]">
      Declared property schema for the event.

      <Expandable title="property attributes">
        <ResponseField name="propertyName" type="string">
          Property identifier.
        </ResponseField>

        <ResponseField name="type" type="string">
          Declared type: `string`, `number`, `date`, or `boolean`.
        </ResponseField>

        <ResponseField name="description" type="string | null">
          Optional human-readable description.
        </ResponseField>

        <ResponseField name="suggestedValues" type="array">
          Suggested values for the property (may be empty).
        </ResponseField>
      </Expandable>
    </ResponseField>

    <ResponseField name="data.projectId" type="string">
      The project this event definition belongs to.
    </ResponseField>

    <ResponseField name="data.createdAt" type="string">
      ISO 8601 timestamp of creation
    </ResponseField>

    <ResponseField name="data.updatedAt" type="string">
      ISO 8601 timestamp of last update
    </ResponseField>
  </Expandable>
</ResponseField>

#### Error Responses

<ResponseField name="400 - Invalid event name" type="object">
  ```json theme={null}
  {
    "success": false,
    "error": {
      "message": "Event name can only contain ASCII letters (a-z, A-Z), numbers (0-9), and underscores (_).",
      "code": "INVALID_EVENT_NAME_CHARACTERS"
    }
  }
  ```
</ResponseField>

<ResponseField name="409 - Event already exists" type="object">
  Returned when an event with the same `eventName` already exists in the project.

  ```json theme={null}
  {
    "success": false,
    "error": {
      "message": "Event with this name already exists in the project",
      "code": "EVENT_ALREADY_EXISTS"
    }
  }
  ```
</ResponseField>

<ResponseField name="400 - Max events reached" type="object">
  Returned when the project has 100 active event definitions.

  ```json theme={null}
  {
    "success": false,
    "error": {
      "message": "Maximum number of events (100) reached for this project.",
      "code": "MAX_EVENTS_REACHED"
    }
  }
  ```
</ResponseField>


## OpenAPI

````yaml POST /events
openapi: 3.1.0
info:
  title: AutoSend API
  description: >-
    AutoSend REST API for managing event definitions and recording event logs
    for a project. These endpoints accept a standard project API key (AS_
    prefix).
  version: 1.0.0
servers:
  - url: https://api.autosend.com/v1
security:
  - bearerAuth: []
paths:
  /events:
    post:
      summary: Create Event
      description: Creates a new event definition under the project.
components: {}

````

## Related topics

- [Events](/automations/events.md)
- [Update Event](/api-reference/events/update-event.md)
- [Event Types](/others/webhooks/event-type.md)
- [Create Webhook](/api-reference/webhooks/create-webhook.md)
- [How to Create an Email Automation](/automations/create.md)