json2go

Package json2go provides utilities for creating well formatted go type representation from json inputs.

Demo page

Simple web page with webassembly json2go parser

https://m-zajac.github.io/json2go

Installation

go get github.com/m-zajac/json2go/...

Usage

Json2go can be used as cli tool or as package.

CLI tools can be used directly to create go type from stdin data (see examples).

Package provides Parser, which can consume multiple jsons and outputs go type fitting all inputs (see examples and documentation). Example usage: read documents from document-oriented database and feed them too parser for go struct.

CLI usage examples

echo '{"x":1,"y":2}' | json2go

---

curl -s https://api.punkapi.com/v2/beers?page=1&per_page=5 | json2go

Check this one :)

---

cat data.json | json2go

Package usage examples

inputs := []string{
	`{"x": 123, "y": "test", "z": false}`,
	`{"a": 123, "x": 12.3, "y": true}`,
}

parser := json2go.NewJSONParser("Document")
for _, in := range inputs {
	parser.FeedBytes([]byte(in))
}

res := parser.String()
fmt.Println(res)

Example outputs

{
    "line": {
        "point1": {
            "x": 12.1,
            "y": 2
        },
        "point2": {
            "x": 12.1,
            "y": 2
        }
    }
}

type Document struct {
	Line struct {
		Point1 Point `json:"point1"`
		Point2 Point `json:"point2"`
	} `json:"line"`
}
type Point struct {
	X float64 `json:"x"`
	Y int     `json:"y"`
}

---

[
    {
        "name": "water",
        "type": "liquid",
        "boiling_point": {
            "units": "C",
            "value": 100
        }
    },
    {
        "name": "oxygen",
        "type": "gas",
        "density": {
            "units": "g/L",
            "value": 1.429
        }
    },
    {
        "name": "carbon monoxide",
        "type": "gas",
        "dangerous": true,
        "boiling_point": {
            "units": "C",
            "value": -191.5
        },
        "density": {
            "units": "kg/m3",
            "value": 789
        }
    }
]

type Document []struct {
	BoilingPoint *UnitsValue `json:"boiling_point,omitempty"`
	Dangerous    *bool       `json:"dangerous,omitempty"`
	Density      *UnitsValue `json:"density,omitempty"`
	Name         string      `json:"name"`
	Type         string      `json:"type"`
}
type UnitsValue struct {
	Units string  `json:"units"`
	Value float64 `json:"value"`
}