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Serializes input into a JSON-formatted string. Properties with leading $ characters will be stripped since angular uses this notation internally.

## Usage

`angular.toJson(obj, [pretty]);`

### Arguments

Param | Type | Details
--- | --- | ---
obj | Object Array Date string number | Input to be serialized into JSON.
pretty (optional) | boolean | If set to true, the JSON output will contain newlines and whitespace.

### Returns

string undefined | JSON-ified string representing `obj`.