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Json Data Validator

Description : Library for data validation based on data schemas

This project is licensed under the terms of the MIT license.

Interfaces and classes

DataType

Allows to encapsulate the data into an object and format it in order to be validated using a DataSchema.

JsonData

JsonData implements DataType.

JsonData::format() uses json_decode() to format json string into php array.

DataRule

Allows to validate [DataType]() based on rule specifications (is the data optional ?, is the data allowed to be...).

JsonRule

JsonRule implement DataRule.

JsonRule can validate :

DataSchema

DataSchema is the library main class. It allows to validate DataType based on sub-schemas and DataRule.

DataSchema::validate() method allows this validation. If DataSchema::validate() does not validate the DataType it throws an [InvalidDataException]().

JsonSchema

JsonSchema implements DataSchema and validates JsonData using JsonRule.

How it works

See tests for examples

A JsonSchema has a type : object or list.

Objects are composed of rules and "child" schemas if needed.

This is a schema definition :

Schemas are just php arrays passe to JsonSchema::setSchema() method.

This schema is composed of 3 elements :

• a rule success which :

  • is a boolean
  • can not be null
  • is not optional

• a rule error which :

  • is a string
  • can be null
  • is not optional
• a "child" schema user which :
  • is an object and therefor is represented by a schema which contains 2 elements : a name (string) and an age (integer)
  • can be null
  • is optional

When a data unit is being validated using this schema by calling the JsonSchema::validate() method, the schema will check recursively if the data respects the rules and the "child" schemas.

If the data has :

• a boolean element success
• a null or string element error
• an optionally, null or object element user which must have :
  • a string element name
  • an integer element age

This data is valid :

This one is not :

As said earlier, rules can be used to validate length or data pattern.

This schema uses the pattern validation on the name element and the length validation on the geolocation element :

When calling the JsonSchema::validate() method, the schema will recursively check all the rule set and "child" schemas. If one rule or one "child" schema is invalid, JsonSchema::validate() returns false.

The "first level" schema is an object typed schema. It could be changed but is not meant to.

Finally, if a "child" schema is typed as an object, the schema will validate it as described above. If it's typed as a list, the schema will simply check each element of the data as an object type using the given "child" schema.