Validate Swagger Objects

A detailed validation provider for Swagger objects.

Given a relevant Swagger spec, this tool will provide detailed information about any validation errors which can be caught automatically. This is useful for catching invalid requests to a server on the client-side before a call is ever issues. Currently, these objects can be validated according to their Swagger specification:

• Models (supports inheritance)
• Operations
• Data types

Basic Example

var catModel = {
    id: 'Cat',
    required: ['name'],
    properties: {
      name: { type: 'string' },
      age: { type: 'number' }
    }
};

var myCat = {
    name: 'Grumpy',
    age: 'blue'
};

var error = swaggerValidate.model(myCat, catModel);

console.error(error.toString());
// ValidationErrors: Cat is invalid:
//   age is invalid: "blue" is not a number (got a string instead)

Installation and Use

For nodejs: npm install swagger-validate then use var swaggerValidate = require('swagger-validate') to include it in a script.

For browsers: bower install swagger-validate or include the ./dist/swagger-validate.js file as a script tag to put the swaggerValidate function in the global scope. You may also require it with browserify or with Requirejs instead of including it as a script tag.

API

var error = swaggerValidate.model(object, model[, models])

Validate an object using a given model spec.

Parameters

• object - the instance to validate against the defined model
• model - the model to use when validating the object
• models - optional map of model names to models to be used when dereferencing linked models (such as $refs or inherited properties).

Returns

• error or undefined - if a validation error is found, a ValidationErrors object will be returned with the details of the error(s).

swaggerValidate.errors.ValidationErrors

The primary error object emitted by the validator with the following properties:

• name - The name of the error (always 'ValidationErrors')
• message - A human readable message of the error
• specName - The name of the specification object used for the validation
• spec - The specification used for the validation (such as a model or an operation object)
• value - The object which failed the validation
• errors - A list of ValidationError objects for each invalid field in the given object.

swaggerValidate.errors.ValidationError

This is the wrapper around individual validation errors. Each invalid field in a given object will have one ValidationError object within the ValidationErrors.errors list.

• name - The name of the error (always 'ValidationError')
• message - A human readable message of the error
• specName - The name of the specification object used for the validation
• spec - The specification used for the validation (such as a model property or an operation parameter)
• error - A subtype of DataTypeValidationError object with specific error details.

swaggerValidate.errors.DataValidationError

This is a super class for the individual validation errors that can occur in properties. Here's a full list of the different types, all which are accessable via swaggerValidate.errors[name of error]:

• NotAStringError - The value was expected to be a string but wasn't.
• NotABooleanError - The value was expected to be a boolen but wasn't.
• NotAnArrayError - The value was expected to be an array but wasn't.
• NotVoidError - The value was expected to be void but wasn't.
• NotANumberError - The value was expected to be a number but wasn't.
• NotAnIntegerError - The value was a number but not an integer as expected.
• NumberTooLargeError - The value was a number but over the maximum value allowed by the model.
• NumberTooSmallError - The value was a number but under the minumum value allowed by the model.
• DuplicateInSetError - The value is an array which has duplicates, which is not allowed by the model.
• ErrorsInArrayElementsError - Errors occurred within the elements of an array. Depending on the type of an array these errors may be of ValidationErrors type or subtypes of DataValidationErrors.
• MissingValueError - The value is required by the model but doesn't exist.

Developing

After installing nodejs execute the following:

git clone https://github.com/signalfx/swagger-validate.git
cd swagger-validate
npm install
npm run dev

The build engine will test and build everything, start a server hosting the example folder on localhost:3000, and watch for any changes and rebuild when nescessary.

To generate minified files in dist:

npm run dist