diff --git a/genai/package.json b/genai/package.json
index 8713d4595e..d04ae788d4 100644
--- a/genai/package.json
+++ b/genai/package.json
@@ -23,6 +23,7 @@
     "chai": "^4.5.0",
     "mocha": "^10.0.0",
     "sinon": "^18.0.0",
-    "uuid": "^10.0.0"
+    "uuid": "^10.0.0",
+    "proxyquire": "^2.1.3"
   }
 }
diff --git a/genai/test/tuning-job-create.test.js b/genai/test/tuning-job-create.test.js
new file mode 100644
index 0000000000..3785c8b977
--- /dev/null
+++ b/genai/test/tuning-job-create.test.js
@@ -0,0 +1,56 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+'use strict';
+
+const {assert} = require('chai');
+const {describe, it} = require('mocha');
+const proxyquire = require('proxyquire').noCallThru();
+
+const projectId = process.env.CAIP_PROJECT_ID;
+
+describe('tuning-job-create', () => {
+  it('should create tuning job and return job name', async function () {
+    this.timeout(1000000);
+    const mockTuningJob = {
+      name: 'test-tuning-job',
+      experiment: 'test-experiment',
+      tunedModel: {
+        model: 'test-model',
+        endpoint: 'test-endpoint',
+      },
+    };
+
+    class MockTunings {
+      async tune() {
+        return mockTuningJob;
+      }
+      async get() {}
+    }
+
+    class MockGoogleGenAI {
+      constructor() {
+        this.tunings = new MockTunings();
+      }
+    }
+
+    const sample = proxyquire('../tuning/tuning-job-create.js', {
+      '@google/genai': {GoogleGenAI: MockGoogleGenAI},
+    });
+
+    const response = await sample.createTuningJob(projectId);
+
+    assert.strictEqual(response, 'test-tuning-job');
+  });
+});
diff --git a/genai/test/tuning-job-get.test.js b/genai/test/tuning-job-get.test.js
new file mode 100644
index 0000000000..06b136f66d
--- /dev/null
+++ b/genai/test/tuning-job-get.test.js
@@ -0,0 +1,58 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+'use strict';
+
+const {assert} = require('chai');
+const {describe, it} = require('mocha');
+const proxyquire = require('proxyquire').noCallThru();
+
+const projectId = process.env.GOOGLE_CLOUD_PROJECT || 'test-project';
+
+describe('tuning-job-get', () => {
+  it('should get tuning job and return job name', async function () {
+    this.timeout(1000000);
+
+    const mockTuningJob = {
+      name: 'test-tuning-job',
+      experiment: 'test-experiment',
+      tunedModel: {
+        model: 'test-model',
+        endpoint: 'test-endpoint',
+      },
+    };
+
+    class MockTunings {
+      async get({name}) {
+        if (name !== 'TestJobName')
+          throw new Error('Unexpected tuning job name');
+        return mockTuningJob;
+      }
+    }
+
+    class MockGoogleGenAI {
+      constructor() {
+        this.tunings = new MockTunings();
+      }
+    }
+
+    const sample = proxyquire('../tuning/tuning-job-get.js', {
+      '@google/genai': {GoogleGenAI: MockGoogleGenAI},
+    });
+
+    const response = await sample.getTuningJob('TestJobName', projectId);
+
+    assert.strictEqual(response, 'test-tuning-job');
+  });
+});
diff --git a/genai/test/tuning-job-list.test.js b/genai/test/tuning-job-list.test.js
new file mode 100644
index 0000000000..500e81d7e7
--- /dev/null
+++ b/genai/test/tuning-job-list.test.js
@@ -0,0 +1,28 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+'use strict';
+
+const {assert} = require('chai');
+const {describe, it} = require('mocha');
+
+const projectId = process.env.CAIP_PROJECT_ID;
+const sample = require('../tuning/tuning-job-list.js');
+
+describe('tuning-job-list', () => {
+  it('should return tuning job list', async () => {
+    const output = await sample.listTuningJobs(projectId);
+    assert(output);
+  });
+});
diff --git a/genai/test/tuning-textgen-with-txt.test.js b/genai/test/tuning-textgen-with-txt.test.js
new file mode 100644
index 0000000000..3cd9886553
--- /dev/null
+++ b/genai/test/tuning-textgen-with-txt.test.js
@@ -0,0 +1,67 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// You may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+'use strict';
+
+const {assert} = require('chai');
+const {describe, it} = require('mocha');
+const proxyquire = require('proxyquire').noCallThru();
+
+const projectId = process.env.CAIP_PROJECT_ID;
+
+describe('tuning-textgen-with-txt', () => {
+  it('should fetch tuning job and generate content', async function () {
+    this.timeout(1000000);
+
+    const mockTuningJob = {
+      name: 'test-tuning-job',
+      experiment: 'test-experiment',
+      tunedModel: {
+        model: 'test-model',
+        endpoint: 'test-endpoint',
+      },
+    };
+
+    const mockGenerateContentResult = {
+      text: 'Because it is hot and glowing!',
+    };
+
+    class MockTunings {
+      async get() {
+        return mockTuningJob;
+      }
+    }
+
+    class MockModels {
+      async generateContent() {
+        return mockGenerateContentResult;
+      }
+    }
+
+    class MockGoogleGenAI {
+      constructor() {
+        this.tunings = new MockTunings();
+        this.models = new MockModels();
+      }
+    }
+
+    const sample = proxyquire('../tuning/tuning-textgen-with-txt.js', {
+      '@google/genai': {GoogleGenAI: MockGoogleGenAI},
+    });
+
+    const response = await sample.generateContent(projectId);
+
+    assert.strictEqual(response, 'Because it is hot and glowing!');
+  });
+});
diff --git a/genai/tuning/tuning-job-create.js b/genai/tuning/tuning-job-create.js
new file mode 100644
index 0000000000..a80eac85c7
--- /dev/null
+++ b/genai/tuning/tuning-job-create.js
@@ -0,0 +1,72 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+'use strict';
+
+// [START googlegenaisdk_tuning_job_create]
+const {GoogleGenAI} = require('@google/genai');
+
+const GOOGLE_CLOUD_PROJECT = process.env.GOOGLE_CLOUD_PROJECT;
+const GOOGLE_CLOUD_LOCATION = process.env.GOOGLE_CLOUD_LOCATION || 'global';
+
+async function createTuningJob(
+  projectId = GOOGLE_CLOUD_PROJECT,
+  location = GOOGLE_CLOUD_LOCATION
+) {
+  const client = new GoogleGenAI({
+    vertexai: true,
+    project: projectId,
+    location: location,
+  });
+
+  function sleep(ms) {
+    return new Promise(resolve => setTimeout(resolve, ms));
+  }
+
+  let tuningJob = await client.tunings.tune({
+    baseModel: 'gemini-2.5-flash',
+    trainingDataset: {
+      gcsUri:
+        'gs://cloud-samples-data/ai-platform/generative_ai/gemini/text/sft_train_data.jsonl',
+    },
+    config: {
+      tunedModelDisplayName: 'Example tuning job',
+    },
+  });
+  console.log('Created tuning job:', tuningJob);
+
+  const runningStates = new Set(['JOB_STATE_PENDING', 'JOB_STATE_RUNNING']);
+
+  while (runningStates.has(tuningJob.state)) {
+    console.log(`Job state: ${tuningJob.state}`);
+    tuningJob = await client.tunings.get({name: tuningJob.name});
+    await sleep(60000);
+  }
+
+  console.log(tuningJob.tunedModel.model);
+  console.log(tuningJob.tunedModel.endpoint);
+  console.log(tuningJob.experiment);
+
+  // Example response:
+  //  projects/123456789012/locations/us-central1/models/1234567890@1
+  //  projects/123456789012/locations/us-central1/endpoints/123456789012345
+  //  projects/123456789012/locations/us-central1/metadataStores/default/contexts/tuning-experiment-2025010112345678
+
+  return tuningJob.name;
+}
+// [END googlegenaisdk_tuning_job_create]
+
+module.exports = {
+  createTuningJob,
+};
diff --git a/genai/tuning/tuning-job-get.js b/genai/tuning/tuning-job-get.js
new file mode 100644
index 0000000000..2c49ecd381
--- /dev/null
+++ b/genai/tuning/tuning-job-get.js
@@ -0,0 +1,52 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+'use strict';
+
+// [START googlegenaisdk_tuning_job_get]
+const {GoogleGenAI} = require('@google/genai');
+const GOOGLE_CLOUD_PROJECT = process.env.GOOGLE_CLOUD_PROJECT;
+const GOOGLE_CLOUD_LOCATION = process.env.GOOGLE_CLOUD_LOCATION || 'global';
+const TUNING_JOB_NAME = 'TestJobName';
+
+async function getTuningJob(
+  tuningJobName = TUNING_JOB_NAME,
+  projectId = GOOGLE_CLOUD_PROJECT,
+  location = GOOGLE_CLOUD_LOCATION
+) {
+  const client = new GoogleGenAI({
+    vertexai: true,
+    project: projectId,
+    location: location,
+  });
+
+  // Get the tuning job and the tuned model.
+  const tuningJob = await client.tunings.get({name: tuningJobName});
+
+  console.log(tuningJob.tunedModel.model);
+  console.log(tuningJob.tunedModel.endpoint);
+  console.log(tuningJob.experiment);
+
+  // Example response:
+  //  projects/123456789012/locations/us-central1/models/1234567890@1
+  //  projects/123456789012/locations/us-central1/endpoints/123456789012345
+  //  projects/123456789012/locations/us-central1/metadataStores/default/contexts/tuning-experiment-2025010112345678
+
+  return tuningJob.name;
+}
+// [END googlegenaisdk_tuning_job_get]
+
+module.exports = {
+  getTuningJob,
+};
diff --git a/genai/tuning/tuning-job-list.js b/genai/tuning/tuning-job-list.js
new file mode 100644
index 0000000000..e7b0910aba
--- /dev/null
+++ b/genai/tuning/tuning-job-list.js
@@ -0,0 +1,48 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+'use strict';
+
+// [START googlegenaisdk_tuning_job_list]
+const {GoogleGenAI} = require('@google/genai');
+const GOOGLE_CLOUD_PROJECT = process.env.GOOGLE_CLOUD_PROJECT;
+const GOOGLE_CLOUD_LOCATION = process.env.GOOGLE_CLOUD_LOCATION || 'global';
+
+async function listTuningJobs(
+  projectId = GOOGLE_CLOUD_PROJECT,
+  location = GOOGLE_CLOUD_LOCATION
+) {
+  const client = new GoogleGenAI({
+    vertexai: true,
+    project: projectId,
+    location: location,
+  });
+
+  const responses = await client.tunings.list();
+
+  for await (const item of responses) {
+    if (item.name && item.name.includes('/tuningJobs/')) {
+      console.log(item.name);
+      // Example response:
+      //  projects/123456789012/locations/us-central1/tuningJobs/123456789012345
+    }
+  }
+
+  return responses;
+}
+// [END googlegenaisdk_tuning_job_list]
+
+module.exports = {
+  listTuningJobs,
+};
diff --git a/genai/tuning/tuning-textgen-with-txt.js b/genai/tuning/tuning-textgen-with-txt.js
new file mode 100644
index 0000000000..7bd6a8804f
--- /dev/null
+++ b/genai/tuning/tuning-textgen-with-txt.js
@@ -0,0 +1,52 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+'use strict';
+
+// [START googlegenaisdk_tuning_textgen_with_txt]
+const {GoogleGenAI} = require('@google/genai');
+const GOOGLE_CLOUD_PROJECT = process.env.GOOGLE_CLOUD_PROJECT;
+const GOOGLE_CLOUD_LOCATION = process.env.GOOGLE_CLOUD_LOCATION || 'global';
+const TUNING_JOB_NAME = 'TestJobName';
+
+async function generateContent(
+  tuningJobName = TUNING_JOB_NAME,
+  projectId = GOOGLE_CLOUD_PROJECT,
+  location = GOOGLE_CLOUD_LOCATION
+) {
+  const client = new GoogleGenAI({
+    vertexai: true,
+    project: projectId,
+    location: location,
+  });
+
+  const tuningJob = await client.tunings.get({name: tuningJobName});
+
+  const content = 'Why lava is red?';
+
+  const response = await client.models.generateContent({
+    model: tuningJob.tunedModel.endpoint,
+    content: content,
+  });
+
+  console.log(response.text);
+  // Example response:
+  //  The lava is red because ...
+  return response.text;
+}
+// [END googlegenaisdk_tuning_textgen_with_txt]
+
+module.exports = {
+  generateContent,
+};