# Import contacts (array)

> POST /audiences/:audience_id/contacts/batch — bulk-import contacts from a JSON array.

`POST /audiences/:audience_id/contacts/batch`

Import up to **10,000 contacts** in a single request by sending a JSON array. Invalid rows (missing or malformed `email`) are counted as skipped and never cause the whole request to fail.

**Body**

| Name | Type | Required | Description |
| --- | --- | --- | --- |
| `contacts` | array | Yes | Array of contact objects to import. You can also send a bare JSON array as the body instead of wrapping it in `{ contacts: [...] }`. |
| `contacts[].email` | string | Yes | Email address. Rows with a missing or invalid email are skipped. |
| `contacts[].first_name` | string | No | Optional first name. |
| `contacts[].last_name` | string | No | Optional last name. |
| `contacts[].unsubscribed` | boolean | No | Optional opt-out flag. Defaults to false. |
| `contacts[].properties` | object | No | Optional map of custom property key/value pairs. |
| `on_conflict` | string | No | `upsert` (default) — update the existing contact when the email already exists. `skip` — leave the existing contact untouched. |

**Node.js**

```js
import { MailBlastr } from 'mailblastr';

const mb = new MailBlastr('mb_xxxxxxxxx');

const { data, error } = await mb.contacts.batch({
  audienceId: 'AUDIENCE_ID',
  "contacts": [
    { "email": "steve@example.com", "first_name": "Steve", "last_name": "Wozniak" },
    { "email": "ada@example.com", "first_name": "Ada", "last_name": "Lovelace" }
  ]
});
console.log({ data, error });
```

**Ruby**

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

uri = URI('https://api.mailblastr.com/audiences/AUDIENCE_ID/contacts/batch')
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true
req = Net::HTTP::Post.new(uri)
req['Authorization'] = 'Bearer mb_xxxxxxxxx'
req['Content-Type'] = 'application/json'
req.body = <<~JSON
{
  "contacts": [
    { "email": "steve@example.com", "first_name": "Steve", "last_name": "Wozniak" },
    { "email": "ada@example.com", "first_name": "Ada", "last_name": "Lovelace" }
  ]
}
JSON
res = http.request(req)
puts res.body
```

**PHP**

```php
<?php
$ch = curl_init('https://api.mailblastr.com/audiences/AUDIENCE_ID/contacts/batch');
curl_setopt_array($ch, [
    CURLOPT_CUSTOMREQUEST => 'POST',
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER => [
        'Authorization: Bearer mb_xxxxxxxxx',
        'Content-Type: application/json',
    ],
    CURLOPT_POSTFIELDS => <<<'JSON'
{
  "contacts": [
    { "email": "steve@example.com", "first_name": "Steve", "last_name": "Wozniak" },
    { "email": "ada@example.com", "first_name": "Ada", "last_name": "Lovelace" }
  ]
}
JSON,
]);
$response = curl_exec($ch);
curl_close($ch);
echo $response;
```

**Python**

```python
import requests

res = requests.post(
    "https://api.mailblastr.com/audiences/AUDIENCE_ID/contacts/batch",
    headers={"Authorization": "Bearer mb_xxxxxxxxx", "Content-Type": "application/json"},
    json={
  "contacts": [
    { "email": "steve@example.com", "first_name": "Steve", "last_name": "Wozniak" },
    { "email": "ada@example.com", "first_name": "Ada", "last_name": "Lovelace" }
  ]
},
)
print(res.json())
```

**Go**

```go
package main

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

func main() {
    req, _ := http.NewRequest("POST", "https://api.mailblastr.com/audiences/AUDIENCE_ID/contacts/batch", strings.NewReader(`{
  "contacts": [
    { "email": "steve@example.com", "first_name": "Steve", "last_name": "Wozniak" },
    { "email": "ada@example.com", "first_name": "Ada", "last_name": "Lovelace" }
  ]
}`))
    req.Header.Set("Authorization", "Bearer mb_xxxxxxxxx")
    req.Header.Set("Content-Type", "application/json")
    res, _ := http.DefaultClient.Do(req)
    defer res.Body.Close()
    out, _ := io.ReadAll(res.Body)
    fmt.Println(string(out))
}
```

**Rust**

```rust
use reqwest::Client;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let res = Client::new()
        .post("https://api.mailblastr.com/audiences/AUDIENCE_ID/contacts/batch")
        .header("Authorization", "Bearer mb_xxxxxxxxx")
        .header("Content-Type", "application/json")
        .body(r#"{
  "contacts": [
    { "email": "steve@example.com", "first_name": "Steve", "last_name": "Wozniak" },
    { "email": "ada@example.com", "first_name": "Ada", "last_name": "Lovelace" }
  ]
}"#)
        .send()
        .await?;
    println!("{}", res.text().await?);
    Ok(())
}
```

**Java**

```java
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

var client = HttpClient.newHttpClient();
var request = HttpRequest.newBuilder()
    .uri(URI.create("https://api.mailblastr.com/audiences/AUDIENCE_ID/contacts/batch"))
    .header("Authorization", "Bearer mb_xxxxxxxxx")
    .header("Content-Type", "application/json")
    .method("POST", HttpRequest.BodyPublishers.ofString("""
{
  "contacts": [
    { "email": "steve@example.com", "first_name": "Steve", "last_name": "Wozniak" },
    { "email": "ada@example.com", "first_name": "Ada", "last_name": "Lovelace" }
  ]
}
"""))
    .build();
var response = client.send(request, HttpResponse.BodyHandlers.ofString());
System.out.println(response.body());
```

**.NET**

```csharp
using System.Net.Http;
using System.Text;

var client = new HttpClient();
var request = new HttpRequestMessage(HttpMethod.Post, "https://api.mailblastr.com/audiences/AUDIENCE_ID/contacts/batch");
request.Headers.Add("Authorization", "Bearer mb_xxxxxxxxx");
request.Content = new StringContent(@"{
  ""contacts"": [
    { ""email"": ""steve@example.com"", ""first_name"": ""Steve"", ""last_name"": ""Wozniak"" },
    { ""email"": ""ada@example.com"", ""first_name"": ""Ada"", ""last_name"": ""Lovelace"" }
  ]
}", Encoding.UTF8, "application/json");
var response = await client.SendAsync(request);
Console.WriteLine(await response.Content.ReadAsStringAsync());
```

**cURL**

```bash
curl -X POST 'https://api.mailblastr.com/audiences/AUDIENCE_ID/contacts/batch' \
  -H 'Authorization: Bearer mb_xxxxxxxxx' \
  -H 'Content-Type: application/json' \
  -d '{
  "contacts": [
    { "email": "steve@example.com", "first_name": "Steve", "last_name": "Wozniak" },
    { "email": "ada@example.com", "first_name": "Ada", "last_name": "Lovelace" }
  ]
}'
```

### Response

```json
{
  "object": "list",
  "imported": 1,
  "updated": 1,
  "skipped": 0,
  "total": 2
}
```

`imported` counts net-new contacts; `updated` counts existing contacts that were merged; `skipped` counts rows that were invalid or left untouched due to `on_conflict: skip`; `total` is the sum of all three.

An empty or entirely-invalid contacts array returns `422 validation_error`. More than 10,000 rows per request is rejected with `422 validation_error`. An unknown audience returns `404 not_found`. See [Errors](https://www.mailblastr.com/docs/api/errors).