diff --git a/webapp/templates/viewer.html b/webapp/templates/viewer.html
index ea7c765..c894a82 100644
--- a/webapp/templates/viewer.html
+++ b/webapp/templates/viewer.html
@@ -251,6 +251,43 @@
   .rescan-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 10px; }
   .rescan-box input[type=file] { font-size: 12px; }
   .rescan-status { font-family: var(--mono); font-size: 12px; color: var(--muted); min-height: 1.2em; }
+
+  .api-layout { display: grid; grid-template-columns: minmax(280px, 1fr) minmax(320px, 1.1fr); gap: 20px; }
+  @media (max-width: 900px) { .api-layout { grid-template-columns: 1fr; } }
+  .api-card {
+    background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius-lg);
+    padding: 16px 18px;
+  }
+  .api-card h3 {
+    font-family: var(--mono); font-size: 12px; color: var(--muted);
+    letter-spacing: .06em; text-transform: uppercase; margin-bottom: 12px;
+  }
+  .api-card p { font-size: 13px; color: var(--text); line-height: 1.55; margin-bottom: 10px; }
+  .api-ep {
+    border: 1px solid var(--border); border-radius: var(--radius);
+    padding: 10px 12px; margin-bottom: 8px; background: var(--bg3);
+  }
+  .api-ep .method {
+    font-family: var(--mono); font-size: 11px; font-weight: 600;
+    color: #1e4a8c; background: #d6e4f7; padding: 2px 7px; border-radius: 4px;
+    margin-right: 8px;
+  }
+  .api-ep .method.post { color: #1a6b45; background: #d8f0e4; }
+  .api-ep code { font-family: var(--mono); font-size: 12px; }
+  .api-ep .desc { font-size: 12px; color: var(--muted); margin-top: 6px; line-height: 1.45; }
+  .api-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 10px; }
+  .api-row select, .api-row input[type=text] {
+    background: var(--bg3); border: 1px solid var(--border); border-radius: var(--radius);
+    color: var(--text); font-family: var(--mono); font-size: 12px; padding: 7px 10px;
+  }
+  .api-row select { min-width: 160px; }
+  .api-row input[type=text] { flex: 1; min-width: 180px; }
+  .api-out {
+    font-family: var(--mono); font-size: 11px; line-height: 1.45;
+    background: #1a1a24; color: #d7dde8; border-radius: var(--radius);
+    padding: 12px; max-height: 420px; overflow: auto; white-space: pre-wrap; word-break: break-word;
+  }
+  .api-note { font-size: 12px; color: var(--muted); margin-top: 8px; }
 </style>
 </head>
 <body>
@@ -268,6 +305,7 @@
   <div class="tab {% if not home_url %}active{% endif %}" onclick="switchTab('editor')">Ключови думи</div>
   <div class="tab" onclick="switchTab('search')">Търсене</div>
   <div class="tab" onclick="switchTab('generator')">Документ</div>
+  <div class="tab" onclick="switchTab('api')">API</div>
 </div>
 
 {% if home_url %}
@@ -368,6 +406,57 @@
   </div>
 </div>
 
+<div id="tab-api" class="panel">
+  <div class="api-layout">
+    <div class="api-card">
+      <h3>Документация — за ERP / интеграции</h3>
+      <p>Base URL: <code id="api-base"></code></p>
+      <p>JSON API за четене на help секции, търсене и (опционално) rescan. Готово за връзка с външни системи.</p>
+
+      <div class="api-ep"><span class="method">GET</span><code>/healthz</code>
+        <div class="desc">Здраве на услугата и БД; <code>output_dir_ok</code>, <code>txt_count</code>.</div></div>
+      <div class="api-ep"><span class="method">GET</span><code>/api/sections?prefix=RIP</code>
+        <div class="desc">Списък секции (метаданни + preview текст). Филтър по <code>prefix</code>.</div></div>
+      <div class="api-ep"><span class="method">GET</span><code>/api/search?q=…&amp;prefix=RIP</code>
+        <div class="desc">Търсене по код / заглавие / keywords / html_text.</div></div>
+      <div class="api-ep"><span class="method">GET</span><code>/api/section/{code}</code>
+        <div class="desc">Една секция с <strong>пълен</strong> текст (<code>text</code>, <code>text_html</code>).</div></div>
+      <div class="api-ep"><span class="method post">POST</span><code>/api/keywords/{code}</code>
+        <div class="desc">Body JSON: <code>{"keywords":"а, б, в"}</code> — обновява ключови думи.</div></div>
+      <div class="api-ep"><span class="method post">POST</span><code>/api/rescan</code>
+        <div class="desc">multipart: <code>file</code> (zip/docx/…), <code>prefix</code>, <code>force</code>. Header опционално: <code>X-Rescan-Token</code>.</div></div>
+      <div class="api-ep"><span class="method">GET</span><code>/api/rescan/{job_id}</code>
+        <div class="desc">Статус на rescan задача (<code>queued</code> / <code>processing</code> / <code>done</code> / <code>error</code>).</div></div>
+
+      <p class="api-note">OpenAPI / Swagger: <a href="/docs" target="_blank" rel="noopener">/docs</a> · ReDoc: <a href="/redoc" target="_blank" rel="noopener">/redoc</a></p>
+      <p class="api-note">Типичен ERP поток: <code>GET /api/search</code> → избор на <code>code</code> → <code>GET /api/section/{code}</code> за съдържание.</p>
+    </div>
+
+    <div class="api-card">
+      <h3>Тестер</h3>
+      <div class="api-row">
+        <select id="api-endpoint" onchange="apiFillExample()">
+          <option value="GET /healthz">GET /healthz</option>
+          <option value="GET /api/sections">GET /api/sections</option>
+          <option value="GET /api/search" selected>GET /api/search</option>
+          <option value="GET /api/section">GET /api/section/{code}</option>
+          <option value="POST /api/keywords">POST /api/keywords/{code}</option>
+        </select>
+        <input type="text" id="api-prefix" placeholder="prefix" value="{{ prefix or 'RIP' }}">
+      </div>
+      <div class="api-row">
+        <input type="text" id="api-q" placeholder="q / code / keywords JSON" value="лимитни карти">
+      </div>
+      <div class="api-row">
+        <button type="button" class="btn-primary" onclick="runApiTest()">Изпълни</button>
+        <button type="button" class="btn-ghost" onclick="copyApiOut()">Копирай отговора</button>
+        <span class="stats" id="api-status"></span>
+      </div>
+      <pre class="api-out" id="api-out">Избери endpoint и натисни „Изпълни“.</pre>
+    </div>
+  </div>
+</div>
+
 <div id="toast"></div>
 
 <script type="application/json" id="sections-data">{{ sections_json | safe }}</script>
@@ -401,13 +490,14 @@ function toast(msg, isErr) {
 }
 
 function switchTab(name) {
-  const order = [{% if home_url %}'home',{% endif %}'editor','search','generator'];
+  const order = [{% if home_url %}'home',{% endif %}'editor','search','generator','api'];
   document.querySelectorAll('.tab').forEach((t,i) => t.classList.toggle('active', order[i] === name));
   document.querySelectorAll('.panel').forEach(p => p.classList.remove('active'));
   const panel = document.getElementById('tab-' + name);
   if (panel) panel.classList.add('active');
   if (name === 'generator') renderGenerator();
   if (name === 'search') doSearch();
+  if (name === 'api') initApiTab();
 }
 
 async function startRescan() {
@@ -870,6 +960,97 @@ function download(filename, content, mime) {
   a.click();
 }
 
+// ── API TAB ─────────────────────────────
+function initApiTab() {
+  const base = document.getElementById('api-base');
+  if (base) base.textContent = location.origin;
+}
+
+function apiFillExample() {
+  const v = document.getElementById('api-endpoint').value;
+  const q = document.getElementById('api-q');
+  if (v.includes('/search')) q.value = 'лимитни карти';
+  else if (v.includes('/section')) q.value = (ALL[0] && ALL[0].code) || 'RIP_0001_SEC_0001';
+  else if (v.includes('/keywords')) q.value = '{"keywords":"тест, erp, demo"}';
+  else if (v.includes('/sections')) q.value = '';
+  else q.value = '';
+}
+
+async function runApiTest() {
+  const ep = document.getElementById('api-endpoint').value;
+  const prefix = (document.getElementById('api-prefix').value || '').trim();
+  const q = (document.getElementById('api-q').value || '').trim();
+  const st = document.getElementById('api-status');
+  const out = document.getElementById('api-out');
+  let method = 'GET';
+  let url = '';
+  let body = null;
+  let headers = {};
+
+  if (ep === 'GET /healthz') {
+    url = '/healthz';
+  } else if (ep === 'GET /api/sections') {
+    url = '/api/sections' + (prefix ? ('?prefix=' + encodeURIComponent(prefix)) : '');
+  } else if (ep === 'GET /api/search') {
+    const qs = new URLSearchParams();
+    if (q) qs.set('q', q);
+    if (prefix) qs.set('prefix', prefix);
+    url = '/api/search?' + qs.toString();
+  } else if (ep === 'GET /api/section') {
+    if (!q) { toast('Въведи code', true); return; }
+    url = '/api/section/' + encodeURIComponent(q);
+  } else if (ep === 'POST /api/keywords') {
+    method = 'POST';
+    // q field: either code only (use sample keywords) or JSON with keywords; code from first token
+    let code = q;
+    let kwBody = { keywords: 'тест, erp' };
+    try {
+      const parsed = JSON.parse(q);
+      if (parsed && typeof parsed === 'object') {
+        if (parsed.code) code = parsed.code;
+        if (parsed.keywords != null) kwBody = { keywords: parsed.keywords };
+      }
+    } catch (_) {
+      // plain code — keep default keywords body
+    }
+    if (!code || code.startsWith('{')) {
+      code = (ALL[0] && ALL[0].code) || '';
+    }
+    if (!code) { toast('Няма code за POST keywords', true); return; }
+    url = '/api/keywords/' + encodeURIComponent(code);
+    headers['Content-Type'] = 'application/json';
+    body = JSON.stringify(kwBody);
+  } else {
+    toast('Непознат endpoint', true);
+    return;
+  }
+
+  st.textContent = method + ' ' + url + ' …';
+  out.textContent = 'Зареждане…';
+  const t0 = performance.now();
+  try {
+    const res = await fetch(url, { method, headers, body });
+    const text = await res.text();
+    let pretty = text;
+    try { pretty = JSON.stringify(JSON.parse(text), null, 2); } catch (_) {}
+    const ms = Math.round(performance.now() - t0);
+    st.textContent = res.status + ' · ' + ms + ' ms · ' + (text.length) + ' B';
+    out.textContent = pretty;
+  } catch (e) {
+    st.textContent = 'грешка';
+    out.textContent = String(e);
+    toast(e.message, true);
+  }
+}
+
+function copyApiOut() {
+  const t = document.getElementById('api-out').textContent || '';
+  navigator.clipboard.writeText(t).then(
+    () => toast('Копирано'),
+    () => toast('Неуспешно копиране', true)
+  );
+}
+
 // ── INIT ─────────────────────────────
 document.getElementById('total-count').textContent = ALL.length + ' секции';
 try {
@@ -877,6 +1058,7 @@ try {
   renderKwCloud();
   doSearch();
   renderGenerator();
+  initApiTab();
 } catch (e) {
   console.error('init failed', e);
   toast('Грешка при зареждане на UI: ' + e.message, true);