const params = {
  TableName: process.env.DYNAMODB_TABLE,
  Key: {
    id: event.pathParameters.id,
  },
  ExpressionAttributeNames: {
    '#todo_text': 'text',
  },
  ExpressionAttributeValues: {
    ':text': data.text,
    ':checked': data.checked,
    ':updatedAt': timestamp,
  },
  UpdateExpression: 'SET #todo_text = :text, checked = :checked, updatedAt = :updatedAt',
  ReturnValues: 'ALL_NEW',
};

const params = {
    TableName: process.env.DYNAMODB_TABLE,
    Key: {
      id: event.pathParameters.id,
    },
    ExpressionAttributeNames: {
      '#user_name': 'name',
    },
    ExpressionAttributeValues: {
      ':name': data.name,
      ':email': data.email,
      ':username': data.username,
      ':password': data.password,
      ':checked': data.checked,
      ':updatedAt': timestamp,
    },
    UpdateExpression: 'SET #user_name = :name, email = :email, username = :username, password = :password, checked = :checked, updatedAt = :updatedAt',
    ReturnValues: 'ALL_NEW',
  };

$ cat test/user-1.json
{
  "name": "Bob",
  "email": "bob@example.com",
  "username": "bob",
  "password": "adfdsfdsf",
  "checked": false
}

$ cat test/user-1.json
{
  "name": "Bob",
  "username": "bob-1",
  "checked": false
}

$ curl -X PUT ${url}/${id} --data '@test/user-1.json'
Couldn't fetch the user item.