revalidator
A cross-browser / node.js validator with JSONSchema compatibility as the primary goal.
Example
The core of revalidator
is simple and succinct: revalidator.validate(obj, schema)
:
var revalidator = ;consoledirrevalidator;
This will return with a value indicating if the obj
conforms to the schema
. If it does not, a descriptive object will be returned containing the errors encountered with validation.
valid: true // or falseerrors: /* Array of errors if valid is false */
In the browser, the validation function is exposed on window.validate
by simply including revalidator.js
.
Installation
Installing npm (node package manager)
$ curl http://npmjs.org/install.sh | sh
Installing revalidator
$ [sudo] npm install revalidator
Usage
revalidator
takes json-schema as input to validate objects.
revalidator.validate (obj, schema, options)
This will return with a value indicating if the obj
conforms to the schema
. If it does not, a descriptive object will be returned containing the errors encountered with validation.
valid: true // or falseerrors: /* Array of errors if valid is false */
Available Options
- validateFormats: Enforce format constraints (default true)
- validateFormatsStrict: When
validateFormats
is true treat unrecognized formats as validation errors (default false) - validateFormatExtensions: When
validateFormats
is true also validate formats defined invalidate.formatExtensions
(default true) - additionalProperties: When
additionalProperties
is true allow additional unvisited properties on the object. (default true) - cast: Enforce casting of some types (for integers/numbers are only supported) when it's possible, e.g.
"42" => 42
, but"forty2" => "forty2"
for theinteger
type.
Schema
For a property an value
is that which is given as input for validation where as an expected value
is the value of the below fields
required
If true, the value should not be undefined
required: true
allowEmpty
If false, the value must not be an empty string
allowEmpty: false
type
The type of value
should be equal to the expected value
type: 'string' type: 'number' type: 'integer' type: 'array' type: 'boolean' type: 'object' type: 'null' type: 'any' type: 'boolean' 'string'
pattern
The expected value regex needs to be satisfied by the value
pattern: /^[a-z]+$/
maxLength
The length of value must be greater than or equal to expected value
maxLength: 8
minLength
The length of value must be lesser than or equal to expected value
minLength: 8
minimum
Value must be greater than or equal to the expected value
minimum: 10
maximum
Value must be lesser than or equal to the expected value
maximum: 10
allowEmpty
Value may not be empty
allowEmpty: false
exclusiveMinimum
Value must be greater than expected value
exclusiveMinimum: 9
exclusiveMaximum
Value must be lesser than expected value
exclusiveMaximum: 11
divisibleBy
Value must be divisible by expected value
divisibleBy: 5 divisibleBy: 05
minItems
Value must contain more than expected number of items
minItems: 2
maxItems
Value must contain fewer than expected number of items
maxItems: 5
uniqueItems
Value must hold a unique set of values
uniqueItems: true
enum
Value must be present in the array of expected values
enum: 'month' 'year'
format
Value must be a valid format
format: 'url' format: 'email' format: 'ip-address' format: 'ipv6' format: 'date-time' format: 'date' format: 'time' format: 'color' format: 'host-name' format: 'utc-millisec' format: 'regex'
conform
Value must conform to constraint denoted by expected value
{ if v%3==1 return true; return false; }
dependencies
Value is valid only if the dependent value is valid
town: required: true dependencies: 'country' country: maxLength: 3 required: true
Nested Schema
We also allow nested schema
properties: title: type: 'string' maxLength: 140 required: true author: type: 'object' required: true properties: name: type: 'string' required: true email: type: 'string' format: 'email'
Custom Messages
We also allow custom messages for different constraints
type: 'string' format: 'url' messages: type: 'Not a string type' format: 'Expected format is a url'
{ ... } message: 'This can be used as a global message'
Tests
All tests are written with vows and should be run with npm:
$ npm test