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Openapi

Simple openapi parser and validator with first class support for both JSON and YAML specifications.

Installation

Install the package:

npm install --save @pluginlab/openapi

Getting started

Parse OpenAPI specification

A few functions are available to parse OpenAPI specifications. Note that none of them does proper validation against a JSON schema, but only some basic integrity checks to ensure that the parsed document is indeed a somewhat valid OpenAPI specification.

The reason for this is that OpenAI themselves does not enforce strict schema validation on plugin manifests. These are commonly only reported as warnings. Most ChatGPT plugins in the store do not pass schema validation anyway.

Parse from plain strings

import { parseFromString } from "@pluginlab/openapi";

const yaml = `
openapi: 3.0.0
info:
  title: Sample API
  description: Optional multiline or single-line description in [CommonMark](http://commonmark.org/help/) or HTML.
  version: 0.1.9
servers:
  - url: http://api.example.com/v1
    description: Optional server description, e.g. Main (production) server
  - url: http://staging-api.example.com
    description: Optional server description, e.g. Internal staging server for testing
paths:
  /users:
    get:
      summary: Returns a list of users.
      description: Optional extended description in CommonMark or HTML.
      responses:
        '200':    # status code
          description: A JSON array of user names
          content:
            application/json:
              schema:
                type: array
                items:
                  type: string

`

const { format, doc } = await parseFromString(yaml);

console.log({ format, doc })

Also supports JSON through the use of the same parse function:

import { parseFromString } from "@pluginlab/openapi"; 

const json = `
{
  "openapi": "3.0.0",
  "info": {
    "title": "Sample API",
    "description": "Optional multiline or single-line description in [CommonMark](http://commonmark.org/help/) or HTML.",
    "version": "0.1.9"
  },
  "servers": [
    {
      "url": "http://api.example.com/v1",
      "description": "Optional server description, e.g. Main (production) server"
    },
    {
      "url": "http://staging-api.example.com",
      "description": "Optional server description, e.g. Internal staging server for testing"
    }
  ],
  "paths": {
    "/users": {
      "get": {
        "summary": "Returns a list of users.",
        "description": "Optional extended description in CommonMark or HTML.",
        "responses": {
          "200": {
            "description": "A JSON array of user names",
            "content": {
              "application/json": {
                "schema": {
                  "type": "array",
                  "items": {
                    "type": "string"
                  }
                }
              }
            }
          }
        }
      }
    }
  }
}

`

const { format, doc } = parseFromString(json);

console.log(doc)

Parse from a javascript object

A function parseFromObject is exported by the package. No example is provided as the function's signature makes it pretty clear how to use it.

Transform spec to another format

This package provides two utilities toJson and toYaml to convert a parsed spec to respectively stringified JSON or YAML.

import { toYaml, toJson, parseFromString } from '@pluginlab/openapi'
import { readFileSync } from 'fs'

const file = readFileSync('./openapi.json', 'utf-8');
const { doc } = parseFromString(file);
const yaml = toYaml(doc);
const json = toJson(doc);

console.log(yaml);
console.log(json);

Validate spec against OpenAI's requirements

OpenAI doesn't have too much requirements when it comes to validating OpenAPI specifications. We attempted to reproduce the same validation they are enforcing so that you can know whether a given specification will work or not for your plugin in a programmatic way.

import { parseFromString, validateForChatGptPlugin } from '@pluginlab/openapi'

const { format, doc } = parseFromString(rawOas);
const validationErrors = validateForChatGptPlugin(doc);