api-doc-parser is a standalone TypeScript library to parse Hydra, Swagger, OpenAPI and GraphQL documentations and transform them in an intermediate representation. This data structure can then be used for various tasks such as creating smart API clients, scaffolding code or building administration interfaces.

It plays well with the API Platform framework.

With Yarn:

yarn add @api-platform/api-doc-parser

Using NPM:

npm install @api-platform/api-doc-parser

If you plan to use the library with Node, you also need a polyfill for the fetch function:

yarn add isomorphic-fetch

Hydra

import { parseHydraDocumentation } from '@api-platform/api-doc-parser';

parseHydraDocumentation('https://demo.api-platform.com').then(({api}) => console.log(api));

OpenAPI v2 (formerly known as Swagger)

import { parseSwaggerDocumentation } from '@api-platform/api-doc-parser';

parseSwaggerDocumentation('https://demo.api-platform.com/docs.json').then(({api}) => console.log(api));

OpenAPI v3

import { parseOpenApi3Documentation } from '@api-platform/api-doc-parser';

parseOpenApi3Documentation('https://demo.api-platform.com/docs.json?spec_version=3').then(({api}) => console.log(api));

GraphQL

import { parseGraphQl } from '@api-platform/api-doc-parser';

parseGraphQl('https://demo.api-platform.com/graphql').then(({api}) => console.log(api));

In order to support OpenAPI, the library makes some assumptions about how the documentation relates to a corresponding ressource:

• The path to get (GET) or edit (PUT) one resource looks like /books/{id} (regular expression used: ^[^{}]+/{[^{}]+}/?$). Note that books may be a singular noun (book). If there is no path like this, the library skips the resource.
• The corresponding path schema is retrieved for get either in the [response / 200 / content / application/json] path section or in the components section of the documentation. If retrieved from the components section, the component name needs to look like Book (singular noun). For put, the schema is only retrieved in the [requestBody / content / application/json] path section. If no schema is found, the resource is skipped.
• If there are two schemas (one for get and one for put), resource fields are merged.
• The library looks for a creation (POST) and list (GET) path. They need to look like /books (plural noun).
• The deletion (DELETE) path needs to be inside the get / edit path.
• In order to reference the resources between themselves (embeddeds or relations), the library guesses embeddeds or references from property names. For instance if a book schema has a reviews property, the library tries to find a Review resource. If there is, a relation or an embedded between Book and Review resources is made for the reviews field. The property name can also be like review_id, reviewId, review_ids or reviewIds for references.
• Parameters are only retrieved in the list path.

API Doc Parser is designed to parse any API documentation format and convert it in the same intermediate representation. If you develop a parser for another format, please open a Pull Request to include it in the library.

yarn test
yarn lint

Created by Kévin Dunglas. Sponsored by Les-Tilleuls.coop.