how to send csrf token through ajax call in laravel?

i have a form with method=post.In that form i have an image upload field which is ajax.when the ajax call process,verify csrf token mismatch error me.this is my code..,

$(document).on("click", "#upload", function() {
var file_data = $("#groupe_img").prop("files")[0]; // Getting the properties of file from file field
var form_data = new FormData(); // Creating object of FormData class
form_data.append("file", file_data) // Appending parameter named file with properties of file_field to form_data
form_data.append("csrftoken",document.mainform.csrftoken.value;) // Adding extra parameters to form_data
url: "/upload_avatar",
dataType: 'script',
cache: false,
contentType: false,
processData: false,
data: form_data, // Setting the data attribute of ajax with file_data
type: 'post'

this is my html portion

<input type="file" name="groupe_img" id="groupe_img">
<button id="upload" value="Upload">upload image</button>


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