slate-to-html.js

import escapeHtml from "escape-html";
import { Text } from "slate";

export const serialize = node => {
  let nodeText = escapeHtml(node.text);
  if (Text.isText(node)) {
    if (node["bold"]) {
      nodeText = `<strong>` + nodeText + `</strong>`;
    }

    if (node["italic"]) {
      nodeText = `<em>` + nodeText + `</em>`;
    }

    if (node["underlined"]) {
      nodeText = `<u>` + nodeText + `</u>`;
    }
    // Other marks should go here like above
    
    return nodeText;
  }

  if (Array.isArray(node)) {
    return node.map(subNode => serializeSubNode(subNode)).join("");
  }

  return serializeSubNode(node);
};

const serializeSubNode = node => {
  const children = node.children.map(n => serialize(n)).join("");
  switch (node.type) {
    case "link":
      return `<a href="${escapeHtml(node.url)}">${children}</a>`;
    default:
      return `<p>${children}</p>`;
  }
};