fastify-oas
OpenAPI 3.0+ (OAS3) documentation generator for Fastify. It uses the schemas you declare in your routes to generate an OpenAPI (swagger) compliant doc.
This plugin based on fastify-swagger that generates swagger 2.0 docs.
This plugin designed in such way to be compatible with it's predcessor and in most cases if you already use fastify-swagger you may just replace it with current plugin and it should work.
ToC
Fastify support
- v0.X.X - v1.X.X - supports fastify v1.X.X
- v2.X.X - will support fastify v2.X.X*
Installation
npm i fastify-oas --saveFeatures and requirements
- Supports OpenAPI 3+.
- Supports fastify-swagger module configs.
- Supports swagger 2.0 fastify schemas.
- Supports fastify named schemas convertion to swaagger/openapi models.
- Requires fastify
>=1.9.0. - Node.js
>=8.9.0.
NOTE: If you need to generate fastify routes from your swagger document - please refer to plugins in See also like fastify-swaggergen or fastify-openapi-glue.
Usage
Add it to your project like regular fastify plugin. Use register method and pass it swagger options, then call the api constructor.
const fastify = require('fastify');
const oas = require('fastify-oas');
const app = fastify();
app.register(oas, {
routePrefix: '/documentation',
swagger: {
info: {
title: 'Test openapi',
description: 'testing the fastify swagger api',
version: '0.1.0',
},
externalDocs: {
url: 'https://swagger.io',
description: 'Find more info here',
},
consumes: ['application/json'],
produces: ['application/json'],
},
exposeRoute: true
});
// put some routes and schemas
app.ready(err => {
if (err) throw err;
app.oas();
});Please note, the schema format for Fastify routes is JSONSchema and you may encounter some differences in the format for route spec vs. output OpenAPI spec.
This plugin includes handling around a few of these differences.
One such case is the example or examples keywords:
fastify.route({
method: 'POST',
url: '/',
schema: {
body: {
type: 'object',
description: 'an object',
examples: [
{
name: 'Object Sample',
summary: 'an example',
value: {a: 'payload'},
}
],
properties: {
a: {type: 'string', description: 'your payload'}
}
}
},
handler: // ...
})Which produces a spec similar to:
{
...
"content": {
"application/json": {
"examples": {
"Object Sample": {
"summary": "an example",
"value": {
"a": "payload"
}
}
},
"schema": {
"type": "object",
"properties": {
"a": {
"type": "string",
"description": "your payload"
}
}
}
}
}
}(in this case, the name property is extracted as the examples key)
Docs
See Docs for more details on the TypeScript types that you may use when working with OpenAPI spec.
Plugin options
| parameter | type | description | default |
|---|---|---|---|
routePrefix |
String | Documentation endpoint | /documentation |
exposeRoute |
Boolean | Object** | If true the plugin will expose the documentation with the following apis: /<routePrefix>, /<routePrefix>/json, /<routePrefix>/yaml
|
addModels |
Boolean | If true adds fastify schemas as openapi models* |
false |
openapi |
String | Openapi version | '3.0.0' |
yaml |
Boolean | If true returns yaml instead of json |
false |
hideUntagged |
Boolean | If true remove routes without tags in schema from resulting swagger file |
false |
swagger |
Object | Swagger object except paths | {} |
Note (*): Fastify-oas plugin gather all schemas, so you should ensure that all of them under current and nested scopes have unique names. Note (**): see Expose route options Back to top
Additional schema options
In order to remove some endpoints from Swagger/OpenAPI document you may add {hide: true} option to route schema.
const fastify = require('fastify')()
fastify.get('/some-secrete-route/:id', {
schema: {
hide: true,
params: {
type: 'object',
properties: {
id: {
type: 'string',
description: 'user id'
}
}
},
response: {
201: {
description: 'Successful response',
type: 'object',
properties: {
hello: { type: 'string' }
}
}
},
}
}, (req, reply) => {})OpenAPI
Unlike regular OpenAPI spec you'll still need some options from swagger 2.0.
const fastify = require('fastify');
const oas = require('fastify-oas');
const app = fastify();
app.register(oas, {
routePrefix: '/documentation',
swagger: {
info: {
title: 'Test openapi',
description: 'testing the fastify swagger api',
version: '0.1.0',
},
externalDocs: {
url: 'https://swagger.io',
description: 'Find more info here',
},
consumes: ['application/json'], // app-wide default media-type
produces: ['application/json'], // app-wide default media-type
servers: [{
url: 'http://api.example.com/v1',
description: 'Optional server description, e.g. Main (production) server',
}],
components: {
// see https://github.com/OAI/OpenAPI-Specification/blob/OpenAPI.next/versions/3.0.0.md#componentsObject for more options
securitySchemes: {
BasicAuth: {
type: 'http',
scheme: 'basic',
},
},
},
},
});Swagger 2.0
This will not generate swagger 2.0 docs. It will generate openapi 3.0 docs, but from swagger 2.0 (and fastify-swagger) compatible configuration. It will allow easily migrate from fastify-swagger.
The example below is taken from fastify-swagger repo to show the differences .
const fastify = require('fastify')()
// before: fastify.register(require('fastify-swagger'), {
fastify.register(require('fastify-oas'), { // after
routePrefix: '/documentation',
swagger: {
info: {
title: 'Test swagger',
description: 'testing the fastify swagger api',
version: '0.1.0'
},
externalDocs: {
url: 'https://swagger.io',
description: 'Find more info here'
},
host: 'localhost',
schemes: ['http'],
consumes: ['application/json'],
produces: ['application/json'],
tags: [
{ name: 'user', description: 'User related end-points' },
{ name: 'code', description: 'Code related end-points' }
],
securityDefinitions: {
apiKey: {
type: 'apiKey',
name: 'apiKey',
in: 'header'
}
}
}
})
fastify.put('/some-route/:id', {
schema: {
description: 'post some data',
tags: ['user', 'code'],
summary: 'qwerty',
params: {
type: 'object',
properties: {
id: {
type: 'string',
description: 'user id'
}
}
},
body: {
type: 'object',
properties: {
hello: { type: 'string' },
obj: {
type: 'object',
properties: {
some: { type: 'string' }
}
}
}
},
response: {
201: {
description: 'Successful response',
type: 'object',
properties: {
hello: { type: 'string' }
}
}
},
security: [
{
"api_key": []
}
]
}
}, (req, reply) => {})
fastify.ready(err => {
if (err) throw err
fastify.oas()
})UI
Swagger UI is available via /<routePrefix>/index.html. By default it's /documentation/index.html.
ReDoc UI is available via /<routePrefix>/docs.html. By default it's /documentation/docs.html.
Development
In order to start development run:
npm i
npm run prepareSo that swagger-ui static folder will be generated for you.
See also
- fastify-swagger - swagger 2.0 docs generation plugin.
- fastify-swaggergen - fastify routes generation from swagger 2.0 docs.
- fastify-openapi-glue - fastify-swaggergen successor, generates fastify routes from swagger 2.0 and openapi 3.0 docs (just like this module, but in opposite direction).
License
Licensed under MIT.