diff --git a/web/static/css/style.css b/web/static/css/style.css
index a65bf9e..d4181a8 100644
--- a/web/static/css/style.css
+++ b/web/static/css/style.css
@@ -108,10 +108,92 @@ main {
     border: 1px solid #e0e0e0;
     border-radius: 8px;
     padding: 2rem;
-    text-align: center;
     color: #555;
 }
 
+#api-connect-form h3 {
+    margin-bottom: 1rem;
+    color: #2c3e50;
+}
+
+.api-form-grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
+    gap: 0.75rem 1rem;
+}
+
+.api-form-field {
+    display: flex;
+    flex-direction: column;
+    gap: 0.35rem;
+    font-size: 0.875rem;
+    color: #2c3e50;
+}
+
+.api-form-field input,
+.api-form-field select {
+    border: 1px solid #d0d7de;
+    border-radius: 4px;
+    padding: 0.5rem 0.6rem;
+    font-size: 0.9rem;
+}
+
+.api-form-field.has-error input,
+.api-form-field.has-error select {
+    border-color: #dc3545;
+}
+
+.field-error {
+    min-height: 1rem;
+    color: #dc3545;
+    font-size: 0.75rem;
+}
+
+.form-errors {
+    margin-bottom: 1rem;
+    border: 1px solid #f0b9bf;
+    background: #fff4f5;
+    color: #8e1f2b;
+    border-radius: 6px;
+    padding: 0.75rem 0.9rem;
+    font-size: 0.85rem;
+}
+
+.form-errors ul {
+    margin: 0.4rem 0 0;
+    padding-left: 1.1rem;
+}
+
+.api-form-actions {
+    margin-top: 0.9rem;
+}
+
+#api-connect-btn {
+    background: #3498db;
+    color: white;
+    border: none;
+    padding: 0.6rem 1.2rem;
+    border-radius: 4px;
+    cursor: pointer;
+}
+
+#api-connect-btn:hover {
+    background: #2980b9;
+}
+
+.api-connect-status {
+    margin-top: 0.75rem;
+    font-size: 0.85rem;
+}
+
+.api-connect-status.success {
+    color: #1f8f4c;
+}
+
+.api-connect-status.error {
+    color: #dc3545;
+}
+
 #upload-status {
     margin-top: 1rem;
     text-align: center;
diff --git a/web/static/js/app.js b/web/static/js/app.js
index 23ebeec..53da0b1 100644
--- a/web/static/js/app.js
+++ b/web/static/js/app.js
@@ -2,6 +2,7 @@
 
 document.addEventListener('DOMContentLoaded', () => {
     initSourceType();
+    initApiSource();
     initUpload();
     initTabs();
     initFilters();
@@ -9,6 +10,7 @@ document.addEventListener('DOMContentLoaded', () => {
 });
 
 let sourceType = 'archive';
+let apiConnectPayload = null;
 
 function initSourceType() {
     const sourceButtons = document.querySelectorAll('.source-switch-btn');
@@ -29,9 +31,214 @@ function setSourceType(nextType) {
     });
 
     const archiveContent = document.getElementById('archive-source-content');
-    const apiPlaceholder = document.getElementById('api-source-placeholder');
+    const apiSourceContent = document.getElementById('api-source-content');
     archiveContent.classList.toggle('hidden', sourceType !== 'archive');
-    apiPlaceholder.classList.toggle('hidden', sourceType !== 'api');
+    apiSourceContent.classList.toggle('hidden', sourceType !== 'api');
+}
+
+function initApiSource() {
+    const apiForm = document.getElementById('api-connect-form');
+    if (!apiForm) {
+        return;
+    }
+
+    const authTypeField = document.getElementById('api-auth-type');
+    const fieldNames = ['host', 'protocol', 'port', 'username', 'authType', 'password', 'token'];
+
+    apiForm.addEventListener('submit', (event) => {
+        event.preventDefault();
+        const { isValid, payload, errors } = validateCollectForm();
+        renderFormErrors(errors);
+        renderApiConnectStatus(isValid, payload);
+
+        if (!isValid) {
+            apiConnectPayload = null;
+            return;
+        }
+
+        apiConnectPayload = payload;
+        console.log('API payload prepared:', apiConnectPayload);
+    });
+
+    fieldNames.forEach((fieldName) => {
+        const field = apiForm.elements.namedItem(fieldName);
+        if (!field) {
+            return;
+        }
+
+        const eventName = field.tagName.toLowerCase() === 'select' ? 'change' : 'input';
+        field.addEventListener(eventName, () => {
+            if (fieldName === 'authType') {
+                toggleApiAuthFields(authTypeField.value);
+            }
+
+            const { errors } = validateCollectForm();
+            renderFormErrors(errors);
+            clearApiConnectStatus();
+        });
+    });
+
+    toggleApiAuthFields(authTypeField.value);
+}
+
+function validateCollectForm() {
+    const host = getApiValue('host');
+    const protocol = getApiValue('protocol');
+    const portRaw = getApiValue('port');
+    const username = getApiValue('username');
+    const authType = getApiValue('authType');
+    const password = getApiValue('password');
+    const token = getApiValue('token');
+
+    const errors = {};
+
+    if (!host) {
+        errors.host = 'Укажите host.';
+    }
+
+    if (!['redfish', 'ipmi'].includes(protocol)) {
+        errors.protocol = 'Выберите протокол.';
+    }
+
+    const port = Number(portRaw);
+    const isPortInteger = Number.isInteger(port);
+    if (!portRaw) {
+        errors.port = 'Укажите порт.';
+    } else if (!isPortInteger || port < 1 || port > 65535) {
+        errors.port = 'Порт должен быть от 1 до 65535.';
+    }
+
+    if (!username) {
+        errors.username = 'Укажите username.';
+    }
+
+    if (!['password', 'token'].includes(authType)) {
+        errors.authType = 'Выберите тип авторизации.';
+    }
+
+    if (authType === 'password' && !password) {
+        errors.password = 'Введите пароль.';
+    }
+
+    if (authType === 'token' && !token) {
+        errors.token = 'Введите токен.';
+    }
+
+    if (Object.keys(errors).length > 0) {
+        return { isValid: false, errors, payload: null };
+    }
+
+    const payload = {
+        sourceType: 'api',
+        connection: {
+            host,
+            protocol,
+            port,
+            username,
+            authType
+        }
+    };
+
+    if (authType === 'password') {
+        payload.connection.password = password;
+    } else {
+        payload.connection.token = token;
+    }
+
+    return { isValid: true, errors: {}, payload };
+}
+
+function renderFormErrors(errors) {
+    const apiForm = document.getElementById('api-connect-form');
+    const summary = document.getElementById('api-form-errors');
+    if (!apiForm || !summary) {
+        return;
+    }
+
+    const errorFields = ['host', 'protocol', 'port', 'username', 'authType', 'password', 'token'];
+    errorFields.forEach((fieldName) => {
+        const errorNode = apiForm.querySelector(`[data-error-for="${fieldName}"]`);
+        if (!errorNode) {
+            return;
+        }
+
+        const fieldWrapper = errorNode.closest('.api-form-field');
+        const message = errors[fieldName] || '';
+        errorNode.textContent = message;
+        if (fieldWrapper) {
+            fieldWrapper.classList.toggle('has-error', Boolean(message));
+        }
+    });
+
+    const messages = Object.values(errors);
+    if (messages.length === 0) {
+        summary.innerHTML = '';
+        summary.classList.add('hidden');
+        return;
+    }
+
+    summary.classList.remove('hidden');
+    summary.innerHTML = `<strong>Исправьте ошибки в форме:</strong><ul>${messages.map(msg => `<li>${escapeHtml(msg)}</li>`).join('')}</ul>`;
+}
+
+function renderApiConnectStatus(isValid, payload) {
+    const status = document.getElementById('api-connect-status');
+    if (!status) {
+        return;
+    }
+
+    if (!isValid) {
+        status.textContent = 'Форма не отправлена: есть ошибки.';
+        status.className = 'api-connect-status error';
+        return;
+    }
+
+    const payloadPreview = { ...payload, connection: { ...payload.connection } };
+    if (payloadPreview.connection.password) {
+        payloadPreview.connection.password = '***';
+    }
+    if (payloadPreview.connection.token) {
+        payloadPreview.connection.token = '***';
+    }
+
+    status.textContent = `Payload сформирован: ${JSON.stringify(payloadPreview)}`;
+    status.className = 'api-connect-status success';
+}
+
+function clearApiConnectStatus() {
+    const status = document.getElementById('api-connect-status');
+    if (!status) {
+        return;
+    }
+
+    status.textContent = '';
+    status.className = 'api-connect-status';
+}
+
+function toggleApiAuthFields(authType) {
+    const passwordField = document.getElementById('api-password-field');
+    const tokenField = document.getElementById('api-token-field');
+
+    if (!passwordField || !tokenField) {
+        return;
+    }
+
+    const useToken = authType === 'token';
+    passwordField.classList.toggle('hidden', useToken);
+    tokenField.classList.toggle('hidden', !useToken);
+}
+
+function getApiValue(fieldName) {
+    const apiForm = document.getElementById('api-connect-form');
+    if (!apiForm) {
+        return '';
+    }
+
+    const field = apiForm.elements.namedItem(fieldName);
+    if (!field || typeof field.value !== 'string') {
+        return '';
+    }
+    return field.value.trim();
 }
 
 // Load and display available parsers
diff --git a/web/templates/index.html b/web/templates/index.html
index 85b439d..9ee54d4 100644
--- a/web/templates/index.html
+++ b/web/templates/index.html
@@ -30,8 +30,68 @@
                 <div id="parsers-info" class="parsers-info"></div>
             </div>
 
-            <div id="api-source-placeholder" class="api-placeholder hidden">
-                <p>Подключение по API будет реализовано на следующих шагах.</p>
+            <div id="api-source-content" class="api-placeholder hidden">
+                <form id="api-connect-form" novalidate>
+                    <h3>Подключение к BMC API</h3>
+                    <div id="api-form-errors" class="form-errors hidden"></div>
+
+                    <div class="api-form-grid">
+                        <label class="api-form-field" for="api-host">
+                            <span>Host</span>
+                            <input id="api-host" name="host" type="text" placeholder="10.0.0.10 или bmc.example.local">
+                            <span class="field-error" data-error-for="host"></span>
+                        </label>
+
+                        <label class="api-form-field" for="api-protocol">
+                            <span>Протокол</span>
+                            <select id="api-protocol" name="protocol">
+                                <option value="">Выберите протокол</option>
+                                <option value="redfish">Redfish</option>
+                                <option value="ipmi">IPMI</option>
+                            </select>
+                            <span class="field-error" data-error-for="protocol"></span>
+                        </label>
+
+                        <label class="api-form-field" for="api-port">
+                            <span>Порт</span>
+                            <input id="api-port" name="port" type="number" min="1" max="65535" placeholder="443">
+                            <span class="field-error" data-error-for="port"></span>
+                        </label>
+
+                        <label class="api-form-field" for="api-username">
+                            <span>Username</span>
+                            <input id="api-username" name="username" type="text" placeholder="admin">
+                            <span class="field-error" data-error-for="username"></span>
+                        </label>
+
+                        <label class="api-form-field" for="api-auth-type">
+                            <span>Тип авторизации</span>
+                            <select id="api-auth-type" name="authType">
+                                <option value="">Выберите тип</option>
+                                <option value="password">Пароль</option>
+                                <option value="token">Токен</option>
+                            </select>
+                            <span class="field-error" data-error-for="authType"></span>
+                        </label>
+
+                        <label class="api-form-field" id="api-password-field" for="api-password">
+                            <span>Пароль</span>
+                            <input id="api-password" name="password" type="password" autocomplete="current-password">
+                            <span class="field-error" data-error-for="password"></span>
+                        </label>
+
+                        <label class="api-form-field hidden" id="api-token-field" for="api-token">
+                            <span>Токен</span>
+                            <input id="api-token" name="token" type="text" autocomplete="off">
+                            <span class="field-error" data-error-for="token"></span>
+                        </label>
+                    </div>
+
+                    <div class="api-form-actions">
+                        <button id="api-connect-btn" type="submit">Подключиться</button>
+                    </div>
+                    <div id="api-connect-status" class="api-connect-status"></div>
+                </form>
             </div>
         </section>