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56 lines
1.5 KiB
Markdown
56 lines
1.5 KiB
Markdown
# jsonx
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It's modified version of [encoding/json](https://golang.org/pkg/encoding/json/)
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which enables extra map field (with `jsonx:"true"` tag) to catch all other fields not declared in the struct.
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`jsonx` is a code name for internal use
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and not related to [JSONx](https://tools.ietf.org/html/draft-rsalz-jsonx-00).
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Example ([Run on playgroud](https://play.golang.org/p/TZi0JeHYG69))
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```go
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package main
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import (
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"encoding/json"
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"fmt"
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"github.com/yaegashi/msgraph.go/jsonx"
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)
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type Extra struct {
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X string
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Y int
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Extra map[string]interface{} `json:"-" jsonx:"true"`
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}
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func main() {
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var x1, x2 Extra
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b := []byte(`{"X":"123","Y":123,"A":"123","B":123}`)
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fmt.Printf("\nUnmarshal input: %s\n", string(b))
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json.Unmarshal(b, &x1)
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fmt.Printf(" json.Unmarshal: %#v\n", x1)
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jsonx.Unmarshal(b, &x2)
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fmt.Printf("jsonx.Unmarshal: %#v\n", x2)
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x := Extra{X: "456", Y: 456, Extra: map[string]interface{}{"A": "456", "B": 456}}
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fmt.Printf("\nMarshal input: %#v\n", x)
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b1, _ := json.Marshal(x)
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fmt.Printf(" json.Marshal: %s\n", string(b1))
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b2, _ := jsonx.Marshal(x)
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fmt.Printf("jsonx.Marshal: %s\n", string(b2))
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}
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```
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Result
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```text
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Unmarshal input: {"X":"123","Y":123,"A":"123","B":123}
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json.Unmarshal: main.Extra{X:"123", Y:123, Extra:map[string]interface {}(nil)}
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jsonx.Unmarshal: main.Extra{X:"123", Y:123, Extra:map[string]interface {}{"A":"123", "B":123}}
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Marshal input: main.Extra{X:"456", Y:456, Extra:map[string]interface {}{"A":"456", "B":456}}
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json.Marshal: {"X":"456","Y":456}
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jsonx.Marshal: {"X":"456","Y":456,"A":"456","B":456}
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```
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