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# JavaScriptCore

Evaluate JavaScript programs from within an app, and support JavaScript scripting of your app.

## Overview

The JavaScriptCore framework provides the ability to evaluate JavaScript programs from within Swift, Objective-C, and C-based apps. You can use also use JavaScriptCore to insert custom objects into the JavaScript environment.

## Topics

### Execution Environment

[`JSVirtualMachine`](/documentation/JavaScriptCore/JSVirtualMachine)

A self-contained environment for JavaScript execution.

[`JSContext`](/documentation/JavaScriptCore/JSContext)

A JavaScript execution environment.

### JavaScript Code

[`JSValue`](/documentation/JavaScriptCore/JSValue)

A JavaScript value.

[`JSManagedValue`](/documentation/JavaScriptCore/JSManagedValue)

A JavaScript value with conditional retain behavior to provide automatic memory management.

### Native Code

[`JSExport`](/documentation/JavaScriptCore/JSExport)

The protocol for exporting Objective-C objects to JavaScript.

### C API

[C JavaScriptCore API](/documentation/JavaScriptCore/c-javascriptcore-api)

Browse the alternative C-based APIs for JavaScriptCore.

### Reference

[JavaScriptCore Constants](/documentation/JavaScriptCore/javascriptcore-constants)


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