incorrect json request

I am trying to import  the following swagger definition.

"metaData": {
"type": "object",
"additionalProperties": {
"type": "string"
}
}
But when i import the swagger json file in Ready API, it shows the following request
{
"metaData" : {
"key" : "key",
"value" : "string"
}
}
instead it should show the following
{
"metaData" : {
"key" : "value"
}
}