valida/README.md

# Valida
Valida - A lightweight sanitizer and validator library for Node.js.

This document describes how Valida library works and which features it offers. Each section of this document includes usage examples. You can find additional examples at [examples](https://github.com/esnunes/valida/tree/master/examples) folder.

## Simple example
```javascript
var schema = {
  id: [
    { sanitizer: Valida.Sanitizer.toInt },
    { validator: Valida.Validator.required }
  ],
  age: [
    { sanitizer: Valida.Sanitizer.toInt },
    { validator: Valida.Validator.required, groups: ['create'] }
  ],
  name: [
    { validator: Valida.Validator.required, groups: ['update'] }
  ],
  answers: [
    { validator: Valida.Validator.array },
    { validator: Valida.Validator.len, min: 3, max: 10 },
  ]
};

var person = { age: '10', answers: ['A', 'D'] };

Valida.process(person, schema, function(err, ctx) {
  if (err) return console.log(err);
  if (!ctx.isValid()) return console.log(ctx.errors());
  console.log('valid', person);
}, ['create']);
```

## Features
- Sanitization
- Synchronous and asynchronous validation
- Groups
- Extensible

All the features are applied through the `process` function.

```js
Valida.process(
  @data,
  @schema,
  @callback,
  @group
);
```
**options:**

* `@data` is the object to be applied the sanitization and validation
* `@schema` is an object describing to Valida how to process it
* `@callback` is a function that is going to be called after processing the data
* `@group` is a string or array describing which groups must be applied in this process (optional)


### Sanitization

Valida supports synchronous sanitization.

* `toInt`
* `toFloat`
* `toDate`
* `trim`

#### toInt

**options:**

* `radix` (optional, default 10)

```js
var schema = {
  age: [{ sanitizer: Valida.Sanitizer.toInt }]
};
```

#### toFloat

**options:**

* `precision` (optional)

```js
var schema = {
  salary: [{ sanitizer: Valida.Sanitizer.toFloat }]
};
```

#### toDate

```js
var schema = {
  birthday: [{ sanitizer: Valida.Sanitizer.toDate }]
};
```

#### trim

**options:**

* `chars` (optional)

```js

var schema = {
  name: [{ sanitizer: Valida.Sanitizer.trim }]
};
```

### Validation

Valida supports both synchronous and asynchronous validation.

* `required`
* `empty`
* `regex`
* `len`
* `array`
* `plainObject`
* `date`

#### required

Field is required.

```js
var schema = {
  age: [{ validator: Valida.Validator.required }]
};
```

#### empty

Field must be empty.

```js
var schema = {
  description: [{ validator: Valida.Validator.empty }]
};
```

#### regex

Validation based in a regex.

**options:**

* `pattern`: regex pattern
* `modifiers`: regex modifier (optional)

```js
var schema = {
  name: [{ validator: Valida.Validator.regex, pattern: '[A-Z]', modifiers: 'i' }]
};
```

#### len

Validation based in the size of an array.

**options:**

* `min`
* `max`

```js
var schema = {
  products: [{ validator: Valida.Validator.len, min: 2, max: 10 }]
};
```

#### array

Field must be an array.

```js
var schema = {
  products: [{ validator: Valida.Validator.array }]
};
```

#### plainObject

Field must be a plain object.

```js
var schema = {
  person: [{ validator: Valida.Validator.plainObject }]
};
```

#### date

Field must be a date.

```js
var schema = {
  createdAt: [{ validator: Valida.Validator.date }]
};
```

#### integer

Field must be a integer.

```js
var schema = {
  createdAt: [{ validator: Valida.Validator.integer }]
};
```

### Groups

Allows reuse the same schema validation for multiple actions. For example on creating an item a specific field is required. But on updating it that field is optional.

```js
var schema = {
  id: [{ validator: Valida.Validator.required, groups: ['update'] }]
  products: [{ validator: Valida.Validator.array, groups: ['create'] }]
};

Valida.process(data, schema, function(err, ctx) {
  console.log('create', create);
}, 'create');
```

### Extensible

## Contributors
Would you like to contribute to this library? Don't be shy! [Contact me](mailto:esnunes@gmail.com) if you are interested on it.

## LICENSE

(MIT License)

Copyright (c) 2013 Eduardo Nunes <esnunes@gmail.com>

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.