npm package: @swatikumar/openapi-to-graphql-cli
Description: CLI for turning APIs described by OpenAPI Specifications (OAS) into GraphQL interfaces
Latest version: 2.2.7

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# OpenAPI-to-GraphQL CLI

Command line interface (CLI) for turning APIs described by [OpenAPI Specification (OAS)](https://github.com/OAI/OpenAPI-Specification) into [GraphQL](https://graphql.org/) interfaces.

<img src="https://raw.githubusercontent.com/ibm/openapi-to-graphql/master/docs/translation.png" alt="Overview of translation" width="600">

_Note: To use OpenAPI-to-GraphQL as a library, refer to the [`openapi-to-graphql`](https://github.com/IBM/openapi-to-graphql/tree/master/packages/openapi-to-graphql) package._

## Installation

```bash
npm i -g openapi-to-graphql-cli
```

## Usage

```
Usage: openapi-to-graphql <OAS JSON file path(s) and/or remote url(s)> [options]

Options:
  -V, --version                  output the version number
  -s, --strict                   throw an error if OpenAPI-to-GraphQL cannot run without compensating for errors or missing data in the OAS
  --save <file path>             save schema to path and do not start server

  -p, --port <port>              select the port where the server will start
  -u, --url <url>                select the base url which paths will be built on
  --cors                         enable Cross-origin resource sharing (CORS)

  -o, --operationIdFieldNames    create field names based on the operationId
  -f, --fillEmptyResponses       create placeholder schemas for operations with no response body rather than ignore them
  --addLimitArgument             add a limit argument on fields returning lists of objects/lists to control the data size
  --genericPayloadArgName        Sets argument name for the payload of a mutation to 'requestBody'
  --simpleNames                  Only remove illegal characters from names in the OAS and ignore casing and formatting
  --singularNames                Experimental feature that will create more meaningful names from the operation path

  -H, --header <key:value>       add headers to every request; repeatable flag; set using key:value notation (default: [])
  -Q, --queryString <key:value>  add query parameters to every request; repeatable flag; set using key:value notation (default: [])

  --no-viewer                    do not create GraphQL viewer objects for passing authentication credentials

  --no-extensions                do not add extentions, containing information about failed REST calls, to the GraphQL errors objects
  --no-equivalentToMessages      do not append information about the underlying REST operations to the description of fields
  -h, --help                     output usage information
```

The basic usage of the CLI takes the specified OAS, creates a GraphQL interface for it, and starts a server to host the GraphQL interface.

```sh
openapi-to-graphql oas.json
```

You can also create a GraphQL interface using multiple OASs.

```sh
openapi-to-graphql oas.json oas2.json oas3.json
```

---

You can specify the OAS by pointing to either a local file or a remote url such as `http://127.0.0.1:3000/openapi.json`. Additionally, you can specify a port number so you can have multiple GraphQL servers running on the same machine.

```sh
openapi-to-graphql http://127.0.0.1:3000/openapi.json -p 3001
```

---

OpenAPI-to-GraphQL can also save a GraphQL schema to a local file, which you can use to inspect or change its content. Please note that the following command will not start the GraphQL server.

```sh
openapi-to-graphql oas.json --save schema.graphql
```

---

You can use multiple `header` and `queryString` to add headers and query strings to the resolvers. Use the syntax: `{key}:{value}`.

```sh
openapi-to-graphql oas.json -H someHeader:someValue -H anotherHeader:anotherValue -Q "exampleQueryString:This one contains spaces!"
```

---

To learn more about the other options, please refer [here](https://github.com/IBM/openapi-to-graphql/tree/master/packages/openapi-to-graphql#options).

Please note that the CLI tool is mainly used for quick testing and does not offer all the features that [`createGraphQLSchema(oas, options)`](https://github.com/IBM/openapi-to-graphql/tree/master/packages/openapi-to-graphql#usage) does.

## License

[MIT](./LICENSE.md)