OpenAPI Typescript Codegen

Node.js library that generates Typescript clients based on the OpenAPI specification.

Why?

• Frontend ❤️ OpenAPI, but we do not want to use JAVA codegen in our builds
• Quick, lightweight, robust and framework-agnostic 🚀
• Supports generation of TypeScript clients
• Supports generations of Fetch, Node-Fetch, Axios, Angular and XHR http clients
• Supports OpenAPI specification v2.0 and v3.0
• Supports JSON and YAML files for input
• Supports generation through CLI, Node.js and NPX
• Supports tsc and @babel/plugin-transform-typescript
• Supports aborting of requests (cancelable promise pattern)
• Supports external references using json-schema-ref-parser

Install

npm install openapi-typescript-codegen --save-dev

Usage

$ openapi --help

  Usage: openapi [options]

  Options:
    -V, --version             output the version number
    -i, --input <value>       OpenAPI specification, can be a path, url or string content (required)
    -o, --output <value>      Output directory (required)
    -c, --client <value>      HTTP client to generate [fetch, xhr, node, axios, angular] (default: "fetch")
    --name <value>            Custom client class name
    --useOptions              Use options instead of arguments
    --useUnionTypes           Use union types instead of enums
    --exportCore <value>      Write core files to disk (default: true)
    --exportServices <value>  Write services to disk (default: true)
    --exportModels <value>    Write models to disk (default: true)
    --exportSchemas <value>   Write schemas to disk (default: false)
    --indent <value>          Indentation options [4, 2, tab] (default: "4")
    --postfixServices         Service name postfix (default: "Service")
    --postfixModels           Model name postfix
    --request <value>         Path to custom request file
    --transformCase <value>   Transforms field names to specified case [camel, snake] (default: none)
    -h, --help                display help for command

  Examples
    $ openapi --input ./spec.json --output ./generated
    $ openapi --input ./spec.json --output ./generated --client xhr

Docker usage

To build the Docker container, execute the following command:

docker build . --tag openapi-typescript-codegen

After this is done, you can execute the CLI commands:

docker run openapi-typescript-codegen --help
docker run openapi-typescript-codegen --input sample.yaml --output client

Documentation

• Basic usage
• OpenAPI object
• Client instances --name
• Argument vs. Object style --useOptions
• Enums vs. Union types --useUnionTypes
• Runtime schemas --exportSchemas
• Enum with custom names and descriptions
• Nullable props (OpenAPI v2)
• Authorization
• External references
• Canceling requests
• Custom request file

Support

• Babel support
• Axios support
• Angular support
• Node-Fetch support