自分のサイトで NPS アンケートを実施する：メールのリンクからスコアまで

function npsRow(respondent, wave) {
  const cells = Array.from({ length: 11 }, (_, score) => {
    const link = new URL("https://example.com/nps");
    link.searchParams.set("score", String(score));
    link.searchParams.set("r", respondent);
    link.searchParams.set("wave", wave);
    return `<td><a href="${link}" style="display:block;padding:8px 10px">${score}</a></td>`;
  });
  return `<table role="presentation"><tr>${cells.join("")}</tr></table>
<p>0 is not at all likely, 10 is extremely likely.</p>`;
}

<form id="nps" action="https://ikiform.com/f/frm_xxxxxxxxxxxxxxxx" method="post">
  <fieldset>
    <legend>How likely are you to recommend us to a friend or colleague?</legend>
    <div id="nps-scale"></div>
  </fieldset>
  <label for="reason" id="reason-label">What's the main reason for your score?</label>
  <textarea id="reason" name="reason" rows="4" maxlength="4000"></textarea>
  <input type="hidden" name="respondent" />
  <input type="hidden" name="wave" />
  <input name="_gotcha" type="text" tabindex="-1" autocomplete="off" hidden />
  <button>Send</button>
  <p id="nps-status" role="status"></p>
</form>

<script>
  const QUESTIONS = [
    [6, "What disappointed you most?"],
    [8, "What would make it a 10 for you?"],
    [10, "What do you value most about it?"],
  ];
  const params = new URLSearchParams(location.search);
  const form = document.getElementById("nps");
  const label = document.getElementById("reason-label");
  const scale = document.getElementById("nps-scale");

  for (let score = 0; score <= 10; score += 1) {
    scale.insertAdjacentHTML(
      "beforeend",
      `<label><input type="radio" name="score" value="${score}" required /> ${score}</label>`,
    );
  }

  function askFor(score) {
    label.textContent = QUESTIONS.find(([top]) => score <= top)[1];
  }

  const preset = Number(params.get("score"));
  if (params.has("score") && Number.isInteger(preset) && preset >= 0 && preset <= 10) {
    form.elements.score.value = String(preset);
    askFor(preset);
  }
  form.elements.respondent.value = params.get("r") ?? "";
  form.elements.wave.value = params.get("wave") ?? "";
  scale.addEventListener("change", (event) => askFor(Number(event.target.value)));

  form.addEventListener("submit", async (event) => {
    event.preventDefault();
    const status = document.getElementById("nps-status");
    status.textContent = "Sending";
    const response = await fetch(form.action, {
      method: "POST",
      headers: { Accept: "application/json" },
      body: new FormData(form),
    }).catch(() => null);
    const result = await response?.json().catch(() => null);
    if (result?.ok) {
      form.replaceChildren(Object.assign(document.createElement("p"), { textContent: "Thanks for answering." }));
      return;
    }
    status.textContent = result?.error?.fields?.score?.[0] ?? result?.error?.message ?? "Couldn't send it. Try again.";
  });
</script>

import { createClient } from "@ikiform/sdk";

const WAVE = process.argv[2] ?? "2026-q4";
const ikiform = createClient({ apiKey: process.env.IKIFORM_SECRET_KEY });
const latest = new Map();

for await (const submission of ikiform.submissions.iterate({ formId: "frm_xxxxxxxxxxxxxxxx", status: "received" })) {
  const { score, respondent, wave } = submission.fields;
  if (wave !== WAVE) continue;
  const key = respondent || submission.id;
  const seen = latest.get(key);
  if (!seen || seen.at < submission.created_at) latest.set(key, { score, at: submission.created_at });
}

const scores = [...latest.values()].map((answer) => answer.score);
const promoters = scores.filter((value) => value >= 9).length;
const detractors = scores.filter((value) => value <= 6).length;
const nps = Math.round(((promoters - detractors) / scores.length) * 100);

console.log(`${WAVE}: ${scores.length} people, ${promoters} promoters, ${detractors} detractors, NPS ${nps}`);