var company = "YOUR_TEAMWORK_SITE_NAME"; var key = "YOUR_API_KEY"; var task_id = "TASK_ID"; var action = "todo_items/" + task_id + ".json"; var new_name = "This task was edited via a PUT AJAX request sent in JSON format."; var json = {"todo-item": { "content": new_name } }; $.ajax({ type: "PUT", url: 'https://' + company + '.teamwork.com/' + action, headers: {"Authorization": "BASIC " + window.btoa(key + ":xxx")}, contentType: "application/json; charset=UTF-8", data: JSON.stringify(json) });