Configuration

@hey-api/openapi-ts supports loading configuration from any file inside your project root folder supported by jiti loader. Below are the most common file formats.

openapi-ts.config.ts

import { defineConfig } from '@hey-api/openapi-ts';

export default defineConfig({
  client: '@hey-api/client-fetch',
  input: 'path/to/openapi.json',
  output: 'src/client',
});

openapi-ts.config.cjs

/** @type {import('@hey-api/openapi-ts').UserConfig} */
module.exports = {
  client: '@hey-api/client-fetch',
  input: 'path/to/openapi.json',
  output: 'src/client',
};

openapi-ts.config.mjs

/** @type {import('@hey-api/openapi-ts').UserConfig} */
export default {
  client: '@hey-api/client-fetch',
  input: 'path/to/openapi.json',
  output: 'src/client',
};

Alternatively, you can use openapi-ts.config.js and configure the export statement depending on your project setup.

Input

Input is the first thing you must define. It can be a path, URL, or a string content resolving to an OpenAPI specification. Hey API supports all valid OpenAPI versions and file formats.

INFO

If you use an HTTPS URL with a self-signed certificate in development, you will need to set NODE_TLS_REJECT_UNAUTHORIZED=0 in your environment.

Output

Output is the next thing to define. It can be either a string pointing to the destination folder or a configuration object containing the destination folder path and optional settings (these are described below).

TIP

You should treat the output folder as a dependency. Do not directly modify its contents as your changes might be erased when you run @hey-api/openapi-ts again.

Clients

Clients are responsible for sending the actual HTTP requests. The client value is not required, but you must define it if you're generating SDKs (enabled by default).

You can learn more on the Clients page.

Plugins

Plugins are responsible for generating artifacts from your input. By default, Hey API will generate TypeScript interfaces and SDK from your OpenAPI specification. You can add, remove, or customize any of the plugins. In fact, we highly encourage you to do so!

You can learn more on the Output page.

Parser

If you're NOT using a legacy client, we encourage you to try out the experimental parser. Soon, it will become the default parser, but until it's been tested it's an opt-in feature. To try it out, set the experimentalParser flag in your configuration to true.

config

export default {
  client: '@hey-api/client-fetch',
  experimentalParser: true, 
  input: 'path/to/openapi.json',
  output: 'src/client',
};

cli

npx @hey-api/openapi-ts \
  -c @hey-api/client-fetch \
  -e \ 
  -i path/to/openapi.json \
  -o src/client

The experimental parser produces a cleaner output while being faster than the legacy parser. It also supports features such as Filters and more are being added.

The legacy parser will be used with the legacy clients regardless of the experimentalParser flag value. However, it's unlikely to receive any further updates.

Formatting

To format your output folder contents, set output.format to a valid formatter.

disabled

export default {
  client: '@hey-api/client-fetch',
  input: 'path/to/openapi.json',
  output: {
    format: false, 
    path: 'src/client',
  },
};

prettier

export default {
  client: '@hey-api/client-fetch',
  input: 'path/to/openapi.json',
  output: {
    format: 'prettier', 
    path: 'src/client',
  },
};

biome

export default {
  client: '@hey-api/client-fetch',
  input: 'path/to/openapi.json',
  output: {
    format: 'biome', 
    path: 'src/client',
  },
};

You can also prevent your output from being formatted by adding your output path to the formatter's ignore file.

Linting

To lint your output folder contents, set output.lint to a valid linter.

disabled

export default {
  client: '@hey-api/client-fetch',
  input: 'path/to/openapi.json',
  output: {
    lint: false, 
    path: 'src/client',
  },
};

eslint

export default {
  client: '@hey-api/client-fetch',
  input: 'path/to/openapi.json',
  output: {
    lint: 'eslint', 
    path: 'src/client',
  },
};

biome

export default {
  client: '@hey-api/client-fetch',
  input: 'path/to/openapi.json',
  output: {
    lint: 'biome', 
    path: 'src/client',
  },
};

oxlint

export default {
  client: '@hey-api/client-fetch',
  input: 'path/to/openapi.json',
  output: {
    lint: 'oxlint', 
    path: 'src/client',
  },
};

You can also prevent your output from being linted by adding your output path to the linter's ignore file.

Filters

WARNING

To use this feature, you must opt in to the experimental parser.

If you work with large specifications and want to generate output from their subset, you can use regular expressions to select the relevant definitions. Set input.include to match resource references to be included or input.exclude to match resource references to be excluded. When both regular expressions match the same definition, input.exclude takes precedence over input.include.

include

export default {
  client: '@hey-api/client-fetch',
  experimentalParser: true, 
  input: {
    // match only the schema named `foo` and `GET` operation for the `/api/v1/foo` path
    include: '^(#/components/schemas/foo|#/paths/api/v1/foo/get)$', 
    path: 'path/to/openapi.json',
  },
  output: 'src/client',
};

exclude

export default {
  client: '@hey-api/client-fetch',
  experimentalParser: true, 
  input: {
    // match everything except for the schema named `foo` and `GET` operation for the `/api/v1/foo` path
    exclude: '^(#/components/schemas/foo|#/paths/api/v1/foo/get)$', 
    path: 'path/to/openapi.json',
  },
  output: 'src/client',
};

Watch Mode

WARNING

Watch mode currently supports only remote files via URL.

If your schema changes frequently, you may want to automatically regenerate the output during development. To watch your input file for changes, enable watch mode in your configuration or pass the --watch flag to the CLI.

config

export default {
  client: '@hey-api/client-fetch',
  input: 'path/to/openapi.json',
  output: 'src/client',
  watch: true, 
};

cli

npx @hey-api/openapi-ts \
  -c @hey-api/client-fetch \
  -i path/to/openapi.json \
  -o src/client \
  -w

Custom Files

By default, you can't keep custom files in the output.path folder because it's emptied on every run. If you're sure you need to disable this behavior, set output.clean to false.

export default {
  client: '@hey-api/client-fetch',
  input: 'path/to/openapi.json',
  output: {
    clean: false, 
    path: 'src/client',
  },
};

WARNING

Setting output.clean to false may result in broken output. Ensure you typecheck your code.

Config API

You can view the complete list of options in the UserConfig interface.

Examples

You can view live examples on StackBlitz.

Sponsors

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