The server-side resource is passed the FormData which contains the file In this example that server-side resource is named upload.php When notified that the JavaScript file upload was successful, send ...

The format is derived from the JavaScript programming language standard and follows JavaScript object syntax. JSON consists of name-object pairs and punctuation in the form of brackets, parentheses, ...

For example, YAML uses indentation for hierarchy, forgoing the braces. Although YML is sometimes used as a data exchange format, its biggest use case is in configuration files.