mirror of
https://github.com/wneessen/niljson.git
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Winni Neessen
dee653ae88
Expanded the description and features to cover both marshalling and unmarshalling of JSON fields. This clarifies the package's functionality, making it clear that it handles not only null values during unmarshalling but also during marshalling.
96 lines
3.5 KiB
Markdown
96 lines
3.5 KiB
Markdown
<!--
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SPDX-FileCopyrightText: 2024 Winni Neessen <wn@neessen.dev>
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SPDX-License-Identifier: CC0-1.0
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-->
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# niljson - A simple Go package for (un-)marshalling null-able JSON types
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[](https://pkg.go.dev/github.com/wneessen/niljson)
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[](https://codecov.io/gh/wneessen/niljson)
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[](https://goreportcard.com/report/github.com/wneessen/niljson)
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[](https://api.reuse.software/info/github.com/wneessen/niljson)
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<a href="https://ko-fi.com/D1D24V9IX"><img src="https://uploads-ssl.webflow.com/5c14e387dab576fe667689cf/5cbed8a4ae2b88347c06c923_BuyMeACoffee_blue.png" height="20" alt="buy ma a coffee"></a>
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niljson provides a simple and efficient way to handle nullable JSON fields during the (un-)marshalling process.
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In JSON, it's common to encounter fields that can be `null`, but handling these fields in Go can be cumbersome,
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especially when dealing with primitive types like `int`, `float64`, `bool`. These types can all be either `0` (as value)
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or `null`. In Go you can always work with pointers but these, of course, can lead to unhandled nil pointer dereferences.
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**niljaon** addresses this challenge by offering a set of types that can seamlessly handle `null` values during
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unmarshalling, allowing your Go applications to work with JSON data more naturally and with fewer boilerplate
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checks for `nil` values.
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### Key Features
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- **Nullable Types**: Provides a range of nullable types (`NilString`, `NilInt`, `NilFloat`, `NilBool`, etc.) that
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are easy to use and integrate into your existing Go structs.
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- **JSON Unmarshalling Support**: Automatically handles the (un-)marshalling of JSON fields, converting `null` JSON
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values to Go's `nil` or zero values, depending on the context.
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- **Minimalistic and Lightweight**: Designed to be lightweight and unobtrusive, so it won't bloat your application
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or introduce unnecessary dependencies (only relies on the Go standard library)
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### Example Usage
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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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"os"
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"github.com/wneessen/niljson"
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)
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type JSONType struct {
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Bool niljson.NilBoolean `json:"bool"`
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Float32 niljson.NilFloat32 `json:"float32,omitempty"`
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Float64 niljson.NilFloat64 `json:"float64"`
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Int niljson.NilInt `json:"int"`
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Int64 niljson.NilInt64 `json:"int64"`
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NullString niljson.NilString `json:"nil"`
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String niljson.NilString `json:"string"`
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}
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func main() {
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data := []byte(`{
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"bytes": "Ynl0ZXM=",
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"bool": true,
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"float32": null,
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"float64":0,
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"int": 123,
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"int64": 12345678901234,
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"nilvalue": null,
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"string":"test"
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}`)
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var example JSONType
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var output string
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if err := json.Unmarshal(data, &example); err != nil {
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fmt.Println("failed to unmarshal JSON:", err)
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os.Exit(1)
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}
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if example.Bool.NotNil() {
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output += fmt.Sprintf("Bool is: %t, ", example.Bool.Value())
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}
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if example.Float32.IsNil() {
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output += "Float 32 is nil, "
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}
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if example.Float64.NotNil() {
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output += fmt.Sprintf("Float 64 is: %f, ", example.Float64.Value())
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}
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if example.String.NotNil() {
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output += fmt.Sprintf("String is: %s", example.String.Value())
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}
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fmt.Println(output)
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data, err := json.Marshal(&example)
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if err != nil {
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fmt.Printf("failed to marshal JSON: %s", err)
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os.Exit(1)
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}
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fmt.Println(data)
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}
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```
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