json.Unmarshal returning blank structure

I have a JSON blob that looks like this

{
    "metadata":{
        "id":"2377f625-619b-4e20-90af-9a6cbfb80040",
        "from":"2014-12-30T07:23:42.000Z",
        "to":"2015-01-14T05:11:51.000Z",
        "entryCount":801,
        "size":821472,
        "deprecated":false
    },
    "status":[{
         "node_id":"de713614-be3d-4c39-a3f8-1154957e46a6",
         "status":"PUBLISHED"
    }]
}

and I have a little code to transform that back into go structs

type Status struct {
    status string
    node_id string
}

type Meta struct {
    to string
    from string
    id string
    entryCount int64
    size int64
    depricated bool
}

type Mydata struct {
    met meta
    stat []status
}

var realdata Mydata
err1 := json.Unmarshal(data, &realdata)
if err1 != nil {
    fmt.Println("error:", err1)
}
fmt.Printf("%T: %+v\n", realdata, realdata)

but what I see when I run this is just a zeroed structure

main.Mydata: {met:{to: from: id: entryCount:0 size:0 depricated:false} stat:[]}

I tried allocating the struct first but that also didn't work, I'm not sure why its not producing values, and its not returning an error

Your struct fields are not exported. This is because they start with a lowercase letter.

EntryCount // <--- Exported
entryCount // <--- Not exported

When I say "not exported", I mean they are not visible outside of your package. Your package can happily access them because they are scoped locally to it.

As for the encoding/json package though - it cannot see them. You need to make all of your fields visible to the encoding/json package by making them all start with an uppercase letter, thereby exporting them:

type Status struct {
    Status  string
    Node_id string
}

type Meta struct {
    To         string
    From       string
    Id         string
    EntryCount int64
    Size       int64
    Depricated bool
}

type Mydata struct {
    Metadata  Meta
    Status []Status
}

See it working on the Go Playground here

You should also reference the Golang specification for answers. Specifically, the part that talks about Exported Identifiers.