Install

Install via npm, pnpm or pnpm:

npm install zod zod-openapi fastify-zod-openapi
## or
pnpm add zod zod-openapi fastify-zod-openapi
## or
pnpm install zod-openapi fastify-zod-openapi

Usage

import fastify from 'fastify';
import {
  type FastifyZodOpenApiSchema,
  type FastifyZodOpenApiTypeProvider,
  serializerCompiler,
  validatorCompiler,
} from 'fastify-zod-openapi';
import { z } from 'zod';
import { extendZodWithOpenApi } from 'zod-openapi';

extendZodWithOpenApi(z);

const app = fastify();

app.setValidatorCompiler(validatorCompiler);
app.setSerializerCompiler(serializerCompiler);

app.withTypeProvider<FastifyZodOpenApiTypeProvider>().route({
  method: 'POST',
  url: '/:jobId',
  schema: {
    body: z.object({
      jobId: z.string().openapi({
        description: 'Job ID',
        example: '60002023',
      }),
    }),
    response: {
      201: z.object({
        jobId: z.string().openapi({
          description: 'Job ID',
          example: '60002023',
        }),
      }),
    },
  } satisfies FastifyZodOpenApiSchema,
  handler: async (req, res) => {
    await res.send({ jobId: req.body.jobId });
  },
});

await app.ready();
await app.listen({ port: 5000 });

Usage with plugins

import { z } from 'zod';
import { FastifyPluginAsyncZodOpenApi } from 'fastify-zod-openapi';

extendZodWithOpenApi(z);

const plugin: FastifyPluginAsyncZodOpenApi = async (fastify, _opts) => {
  fastify.route({
    method: 'POST',
    url: '/',
    // Define your schema
    schema: {
      body: z.object({
        jobId: z.string().openapi({
          description: 'Job ID',
          example: '60002023',
        }),
      }),
      response: {
        201: z.object({
          jobId: z.string().openapi({
            description: 'Job ID',
            example: '60002023',
          }),
        }),
      },
    } satisfies FastifyZodOpenApiSchema,
    handler: async (req, res) => {
      await res.send({ jobId: req.body.jobId });
    },
  });
};

Usage with @fastify/swagger

import fastifySwagger from '@fastify/swagger';
import fastifySwaggerUI from '@fastify/swagger-ui';
import fastify from 'fastify';
import {
  type FastifyZodOpenApiSchema,
  type FastifyZodOpenApiTypeProvider,
  fastifyZodOpenApiPlugin,
  fastifyZodOpenApiTransform,
  fastifyZodOpenApiTransformObject,
  serializerCompiler,
  validatorCompiler,
} from 'fastify-zod-openapi';
import { z } from 'zod';
import { type ZodOpenApiVersion, extendZodWithOpenApi } from 'zod-openapi';

extendZodWithOpenApi(z);

const app = fastify();

app.setValidatorCompiler(validatorCompiler);
app.setSerializerCompiler(serializerCompiler);

const openapi: ZodOpenApiVersion = '3.0.3'; // If this is not specified, it will default to 3.1.0

await app.register(fastifyZodOpenApiPlugin, { openapi });
await app.register(fastifySwagger, {
  openapi: {
    info: {
      title: 'hello world',
      version: '1.0.0',
    },
    openapi,
  },
  transform: fastifyZodOpenApiTransform,
  transformObject: fastifyZodOpenApiTransformObject,
});
await app.register(fastifySwaggerUI, {
  routePrefix: '/documentation',
});

app.withTypeProvider<FastifyZodOpenApiTypeProvider>().route({
  method: 'POST',
  url: '/',
  schema: {
    body: z.string().openapi({
      description: 'Job ID',
      example: '60002023',
    }),
    response: {
      201: {
        content: {
          'application/json': {
            schema: z.object({
              jobId: z.string().openapi({
                description: 'Job ID',
                example: '60002023',
              }),
            }),
          },
        },
      },
    },
  } satisfies FastifyZodOpenApiSchema,
  handler: async (_req, res) =>
    res.send({
      jobId: '60002023',
    }),
});
await app.ready();
await app.listen({ port: 5000 });

Declaring Components

To declare components follow the documentation as declared here.

If you wish to declare the components manually you will need to do so via the plugin's options.

await app.register(fastifyZodOpenApiPlugin, {
  openapi,
  components: { schema: mySchema },
});

Please note: the responses, parameters components do not appear to be supported by the @fastify/swagger library.

Credits

fastify-type-provider-zod: Big kudos to this library for lighting the way with how to create type providers, validators and serializers. fastify-zod-openapi is just an extension to this library whilst adding support for the functionality of zod-openapi.

Development

Prerequisites

• Node.js LTS
• pnpm

pnpm install
pnpm build

Test

pnpm test

Lint

# Fix issues
pnpm format

# Check for issues
pnpm lint

Release

To release a new version

1. Create a new GitHub Release
2. Select 🏷️ Choose a tag, enter a version number. eg. v1.2.0 and click + Create new tag: vX.X.X on publish.
3. Click the Generate release notes button and adjust the description.
4. Tick the Set as the latest release box and click Publish release. This will trigger the Release workflow.
5. Check the Pull Requests tab for a PR labelled Release vX.X.X.
6. Click Merge Pull Request on that Pull Request to update main with the new package version.

To release a new beta version

1. Create a new GitHub Release
2. Select 🏷️ Choose a tag, enter a version number with a -beta.X suffix eg. v1.2.0-beta.1 and click + Create new tag: vX.X.X-beta.X on publish.
3. Click the Generate release notes button and adjust the description.
4. Tick the Set as a pre-release box and click Publish release. This will trigger the Prerelease workflow.