CodePen Embed - xxXpKMr

<h1>Textarea auto resizing</h1>

<textarea placeholder="Type here..."></textarea>

textarea {
  resize: none;
  overflow-y: hidden;
}

let textArea = document.getElementByTagName("textarea");

textArea.addEventListener("input", () => {
  textArea.style.height = "auto"
  textArea.style.height = textArea.scrollHeight + "px"
}

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