Genkit Next.js Plugin

See official documentation for more.

This plugin provides utilities for conveninetly exposing Genkit flows and actions via Next.js app routs for REST APIs.

// /genkit/simpleFlow.ts
const simpleFlow = ai.defineFlow(
  'simpleFlow',
  async (input, streamingCallback) => {
    const { text } = await ai.generate({
      model: googleAI.model('gemini-2.5-flash'),
      prompt: input,
      streamingCallback: (chunk) => streamingCallback(chunk.text),
    });
    return text;
  }
);

// /app/api/simpleFlow/route.ts
import { simpleFlow } from '@/genkit/simpleFlow';
import { appRoute } from '@genkit-ai/next';

export const POST = appRoute(simpleFlow);

APIs can be called with the generic genkit/beta/client library, or @genkit-ai/next/client

import { runFlow, streamFlow } from '@genkit-ai/next/client';
import { simpleFlow } from '@/genkit/simpleFlow';

const result = await runFlow<typeof simpleFlow>({
  url: '/api/simpleFlow',
  input: 'say hello',
});

console.log(result); // hello

// set auth headers (when using auth policies)
const result = await runFlow<typeof simpleFlow>({
  url: `/api/simpleFlow`,
  headers: {
    Authorization: 'open sesame',
  },
  input: 'say hello',
});

console.log(result); // hello

// and streamed
const { stream, output } = streamFlow<typeof simpleFlow>({
  url: '/api/simpleFlow',
  input: 'say hello',
});
for await (const chunk of stream) {
  console.log(chunk.output);
}
console.log(await output); // output is a promise, must be awaited

The sources for this package are in the main Genkit repo. Please file issues and pull requests against that repo.

Usage information and reference details can be found in official Genkit documentation.

License: Apache 2.0