fixjson

fixjson

fixjson is a Go package that converts broken, nonstandard or nonofficial format (e.g. jsonc) to standard json. As an author of this package, I kindly ask you, stop doing that shit and use standard json whenever possible.

The features of the package are:

• remove comments, single line (// text) or multiline (/* text */)
• remove trailing commas, from arrays and objects
• add missing commas after string literals at the end of a line in arrays and objects
• remove unnecessary and invalid escape character of single quotes (')
• escape quotes " in string literals, if they are placed not at the end of a line
• fixes html encoded quotes in json
• replace new line (\n) characters in string literals with \\ following by n
• replace tabs (\t) characters with \\ following by t

{
  /* Example block                                  // multiline comment
   comment */
  "propertyName": {
    "name": "No, you can\'t do that in json",       // invalid escape character
    "value": 5432, // counter                       // inline comment           
    "username": "josh"                              // missing comma
    "password": "pass123",                          // trailing comma
  },

  "title": "Hello                                   // new line in string literal
    World",
}

Install

go get github.com/astappiev/fixjson@latest

Usage

package main

import (
	"encoding/json"
	"fmt"

	"github.com/astappiev/fixjson"
)

func main() {
	raw := []byte(`{
      /* Example block
       comment */
      "propertyName": {
        "name": "No, you can\'t do that in json",
        "value": 5432, // counter   
        "username": "josh"
        "password": "pass123",
      },
    
      "title": "Hello
        World",
    }`)

	var out map[string]any
	if err := fixjson.Unmarshal(raw, &out); err != nil {
		panic(err)
	}

	fmt.Println(out["title"])

	// Or fix first, then unmarshal manually.
	fixed := fixjson.ToJSON(raw)
	_ = json.Unmarshal(fixed, &out)
}

API

• ToJSON(src []byte) []byte: translates input into valid JSON bytes
• Unmarshal(data []byte, v any) error: fixes then unmarshals
• FallbackUnmarshal(data []byte, v any) error: tries standard unmarshal first, then fix+unmarshal