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is-my-schema-valid

Simple function that validates data according to JSONSchema spec (under the hood it is powered by is-my-json-valid which uses code generation to be extremely fast).

Install

npm install is-my-schema-valid --save

Usage

validate(data: Object, schema: Object, options: ?Object) -> { valid: Boolean, errors: ?Array<Object> }

Validate data object against passed schema. Function alwats returns object with boolean valid field, if valid is false there will be additional errors field with the list of error objects.

Options

• filter - filter away fields that are not in the schema, defaults to false
• filterReadonly - filter away fields that are marked as readonly: true in schema, defaults to false

If you search for express middleware take a look on is-express-schema-valid.

Example

import validate from 'is-my-schema-valid';

const schema = {
    email: {
        type: 'string',
        required: true,
        format: 'email'
    },
    password: {
        type: 'string',
        required: true,
        minLength: 1
    }
};

const notValidData = {email: 'foo', password: 'bar'};
const result1 = validate(notValidData, schema);
console.log(result1.valid); // false
console.log(result1.errors); // list of errors

const validData = {email: 'foo@bar.com', password: '123456'};
const result2 = validate(validData, schema);
console.log(result2.valid); // true

Define schemas

When defining a schema you are able to pass a plain object. In this case is-my-schema-valid will automagically populate your schema with default object properties:

const schema = {
    foo: {
        type: 'string',
        required: true
    }
};

// will be passed to validator as:
// { 
//   type: 'object', 
//   required: true, 
//   additionalProperties: false, 
//   properties: { 
//     foo: { 
//       type: 'string', 
//       required: true 
//     }
//   }
// }

In other cases when you need a different type use a full schema. For example, when payload needs to be an array:

const schema = {
    type: 'array',
    uniqueItems: true,
    items: {
        type: 'number'
    }
};

// it will be used as is by validator

Formats

There are several additional formats added for easy validating the requests:

• "mongo-object-id" - check if a string is a valid hex-encoded representation of a MongoDB ObjectId
• "alpha" - check if a string contains only letters (a-zA-Z)
• "alphanumeric" - check if a string contains only letters and numbers
• "numeric" - check if a string contains only numbers
• "hexadecimal" - check if a string is a hexadecimal number
• "hexcolor" - check if a string is a hexadecimal color
• "base64" - check if a string is Base64 encoded
• "decimal" - check if a string is a decimal number, such as 0.1, .3, 1.1, 1.00003, 4.0, etc.
• "int" - check if a string is an integer
• "float" - check if a string is a float
• "uuid" - check if a string is UUID
• "data-uri - check if a string is data uri format

In the example below we can ensure that id is valid MongoDB ObjectId:

import validate from 'is-my-schema-valid';

const schema = {
    id: {
        type: 'string',
        format: 'mongo-object-id'
    }
};

Just a reminder that there are default built-in formats supported by JSONSchema:

• "date-time" - date representation, as defined by RFC 3339, section 5.6.
• "email" - internet email address, see RFC 5322, section 3.4.1.
• "hostname" - internet host name, see RFC 1034, section 3.1.
• "ipv4" - IPv4 address, according to dotted-quad ABNF syntax as defined in RFC 2673, section 3.2.
• "ipv6" - IPv6 address, as defined in RFC 2373, section 2.2.
• "uri" - a universal resource identifier (URI), according to RFC3986.

JSONSchema

In order to get comfortable with JSONSchema spec and its' features I advice you to check the book "Understanding JSON Schema" (also PDF version) or look at examples.

MIT Licensed