api-doc-validator

api ➡️ doc ➡️ validator

Annotations

• @url
• @params
• @query
• @body
• @response
• @namespace
• @schema
• @call

Parameters of annotations

• METHOD
• CODE
• path
• OBJECT_NAME
• json-schema
• object-method-call

Usage

• cli
• API client
• Express middleware
• Universal middleware
• Swagger OpenAPI
• Validation errors handling
• Config

@url

@url [METHOD] path

/**
 * Some description
 * @url POST /path/:param
 */

@params

Validate parameters of @url path

@params [OBJECT_NAME =] json-schema|OBJECT_NAME

/**
 * @url GET /users/:id
 * @params {
 *   # some description for `id` (usefull for OpenApi)
 *   id: number,
 * }
 * @call users.get(id)
 */

or with OBJECT_NAME assign for future use

/**
 * @url GET /users/:id
 * @params User = {
 *   id: number, // description for `id`
 * }
 */

or use an external schema as root schema

/**
 * @url GET /users/:id
 * @params User
 */

or extend external schema

/**
 * @url GET /users/:id
 * @params {
 *   ...User,
 *   name: string,
 * }
 */

@query

Validate @url query parameters

@query [OBJECT_NAME =] json-schema|OBJECT_NAME

/**
 * @url GET /users
 * @query {
 *     id: number,
 * }
 * @call users.get(id)
 */

Example of valid request GET /users?id=1

Names of fields in @params and query should be different to use them in @call

/**
 * @url GET /users/:id
 * @params {
 *     id: number,
 * }
 * @query {
 *     name: string,
 * }
 * @call users.get(id, name)
 */

@body

@body [# Description] [OBJECT_NAME =] json-schema|OBJECT_NAME

/**
 * @body {
 *   id: number,
 *   name: string,
 * }

 * @body User = {
 *   id: number,
 *   name: string,
 * }

 * @body 
 * # Some body description
 * User = {
 *   id: number,
 *   name: string,
 * }
 */

@response

Response http code and validation of response body.

@response [CODE] [# Description] [OBJECT_NAME =] json-schema|OBJECT_NAME

Response for 200 code

/**
 * @response {
 *   id: number,
 *   name: string,
 * }
 */

Validators for different codes of same request

/**
 * @response 200 {
 *   id: number,
 *   name: string,
 * }
 * @response 500 
 * # Some description
 * {
 *   message: string,
 * }
 */

@namespace

Shortcut @ns

Word used to filter validators in target file.

/**
 * Namespace for this validator will be "default"
 * 
 * @url POST /users
 * @body {id: number}
 */

/**
 * @namespace test
 * @url POST /test-success
 * @response 2xx {success: boolean}
 */

/**
 * @ns test
 * @url POST /test-error
 * @response 5xx {error: boolean}
 */

Example of generation express middleware with only test validators

npx adv -c path/to/config.json -n test -e ./test-validator.js

@schema

Define the new schema for future usage

@schema OBJECT_NAME = json-schema|OBJECT_NAME

/**
 * @schema User = {
 *     id: number,
 *     name: string,
 * }
 */

or just to make shorter schema name

/**
 * @schema User = SomeVeryLongSchemaName
 */

@call

You should provide valid js code of method call. This code will be used in your API tests.

@call object-method-call

/**
 * @call object.method(param1, param2)
 */

METHOD

HTTP request method. Default is config.defaultMethod

GET|POST|PUT|DELETE|HEAD|OPTIONS

CODE

HTTP response code. Default is config.defaultCode

Formats:

• 200 regular code number
• 2xx any code between 200 and 299
• 200 - 400 any code between 200 and 400
• 200 || 3xx || 400 - 500 or expression

Example

/**
 * @response 2xx || 301 User = {id: number}
 */

path

URL pathname. For path parsing used path-to-regexp lib.

Parameters like :id can be used in @call as parameter of method call with same name.

/**
 * @url GET /users/:id(\d+)
 * @call users.get(id)
 */

OBJECT_NAME

Any valid js object name like objectName or with field of any deep objectName.fieldName.field

json-schema

Object that describes how validate another object. For validation used ajv.

For syntax details see adv-parser

object-method-call

Uniq sample of JavaScript code with some method call of some object, which will be generated for testing purposes. In method call you can use named parameters from @url

/**
 * @url GET /users
 * @call users.get()
 */

/**
 * @url GET /users/:id
 * @call users.get(id)
 */

/**
 * @url POST /users/:id/settings
 * @call users.setSettings(id)
 */

/**
 * @url POST /users/:id/settings
 * @call users.settings.update(id)
 */

There can be any number of nested objects and any method name. Only names of parameters should be equal.

CLI

with npx

npx adv -c path/to/config.json

Parameters:

  -c, --config <path> path to config json file
  -a, --api-client <path> generate api client
  -b, --base-url <url> default Api.baseUrl
  -e, --express <path> generate express middleware validator
  -o, --open-api <path> generate Swagger OpenAPI v3 json
  -j, --json <path> generate endpoints json
  -n, --namespace <namespace> generate validators only with this namespace or comma separated namespaces
  -M, --default-method <method> default @url METHOD
  -C, --default-code <code> default @response CODE
  -T, --jsdoc-typedefs <boolean> generate typedef, default true
  -R, --jsdoc-refs <boolean> use references to jsdoc @typedef or replace them with reference body, default true
  -I, --include-jsdoc <boolean> include to endpoints jsdoc annotations, default false
  -P, --extra-props <boolean> value for ajv "object" additionalProperties, default false

API client

Install in to your project packages ajv, ajv-formats (optional if you not using String patterns), request (if you don't like request then you will need to implement Api.request) and path-to-regexp. Client will depend on them.

Generate the API client with npx adv -c path/to/config.json -a path/to/your/app/api-client.js

Example

/**
 * @url POST /users
 * @body User = {id: number, name: string}
 * @response 200 User
 * @call addUser()
 */

/**
 * @url GET /users/:id
 * @params {id: number}
 * @response 200 User
 * @call users.get()
 */

Generated api-client.js will export class Api.

const Api = require('./path/to/your/app/api-client.js');
const client = new Api(/* "https://new.base.url" optionaly, default is Api.baseUrl */);

console.log(Api.baseUrl); // value from config.baseUrl or --base-url cli option
console.log(Api.endpoints); // parsed endpoints from comments

// optionaly
Api.getAjv = () => createYourAjvInstance();
Api.request = function ({
   method, 
   url, 
   params /* url params like /:id */, 
   query, 
   body, 
   endpoint /* object from Api.endpoints */, 
   context /* Api class instance */
}) {
    return sendRequestReturnPromise(context.baseUrl + url);
}
// --

await client.addUser({id: 1, name: 'Test'});

client.users.get({id: 1} /* or just 1 if @params has only one parameter */)
  .then(user => {
     console.log(user.name);
     console.log(client.requestCookieJar); // @see request.jar() https://github.com/request/request#examples
  })
  .catch(err => {
     // @see Validation errors handling
  });

Express middleware

Install in to your project packages ajv, ajv-formats (optional if you not using String patterns) and path-to-regexp. Middleware depends on them.

Generate the middleware with npx adv -c path/to/config.json -e path/to/your/app/validator.js

Then add middleware to your express app

const validator = require('./path/to/your/app/validator.js');

// optionaly
validator.getAjv = () => createYourAjvInstance();
// --

app.use(validator);
app.post('...', (req, res) => {});
app.use(function (err, req, res, next) {
    if (err instanceof validator.RequestValidationError) {
        // @see Validation errors handling
    }
    else if (err instanceof validator.ResponseValidationError) {
       // @see Validation errors handling
    }
    else {
        next(err);
    }
    
    // or use base class
   
    if (err instanceof validator.ValidationError) {
       // @see Validation errors handling
    }
    else {
       next(err);
    }
});

Universal middleware

Generate the middleware with npx adv -c path/to/config.json -e path/to/your/app/validator.js

Then add it to your app

const validator = require('./validator.js');

function sendMessage(path, data) {
    try {
       var validateResponse = validator({
          url: path,
          body: data,
       });
    }
    catch (err) {
       // @see RequestValidationError
    }
    
    return ajax(path, data).then(function (result) {
        if (validateResponse) {
           try {
              validateResponse(result);
           }
           catch (err) {
              // @see ResponseValidationError
           }
        }
        
        return result;
    });
}

Swagger OpenAPI

Generate Swagger OpenAPI v3 json with npx adv -c path/to/config.json -o path/to/open-api.json

Validation errors handling

Both Api class and middleware exports three classes:

• ValidationError - base class, extends Error
• RequestValidationError - class of request validation error, extends ValidationError
• ResponseValidationError - class of response validation error, extends ValidationError

let err; // error from api client or middleware validator
let context; // Api class or middleware

if (err instanceof context.RequestValidationError) {
   console.log(err.message);
   console.log(err.property); // query | params | body
   console.log(err.errors); // @see https://github.com/ajv-validator/ajv/blob/master/docs/api.md#validation-errors
}
else if (err instanceof context.ResponseValidationError) {
   console.log(err.message); // "Invalid response body"
   console.log(err.errors); // @see https://github.com/ajv-validator/ajv/blob/master/docs/api.md#validation-errors
}

// or use base class

if (err instanceof context.ValidationError) {
   console.log(err.message);
   console.log(err.property);
   console.log(err.errors);
}

Config

• include array of paths to files relative to config path, glob pattern used
• exclude array of paths to files to be excluded
• defaultMethod overwrites default METHOD. Default is GET
• defaultCode overwrites default CODE. Default is 200
• jsdocTypedefs generate @typedef for each named schema. Default is true
• jsdocRefs use references to @typedef or replace them with reference body. Default is true
• apiClient same as --api-client <path>
• json same as --json <path>
• express same as --express <path>
• openApi same as --open-api <path>
• namespace same as --namespace <namespace>
• includeJsdoc same as --include-jsdoc <boolean>
• extraProps same as --extra-props <boolean>

All paths are relative to config file location.

Example

{
  "include": [
    "src/**/*.js",
    "src/**/*.php"
  ],
  "exclude": [
    "src/tests"
  ],
  "defaultMethod": "POST",
  "defaultCode": "2xx || 301"
}