#json-parser #json #format-json #jsonc #format #decode #hjson

fjson

A library for parsing and formatting json with C-style comments and trailing commas

5 unstable releases

0.3.1 Jan 19, 2023
0.3.0 Jan 15, 2023
0.2.1 Jan 7, 2023
0.2.0 Jan 7, 2023
0.1.0 Jan 6, 2023

#1246 in Parser implementations

Download history 64/week @ 2024-07-28 26/week @ 2024-08-04 79/week @ 2024-08-11 3/week @ 2024-08-18 43/week @ 2024-08-25 4/week @ 2024-09-01 51/week @ 2024-09-08 1/week @ 2024-09-15 64/week @ 2024-09-22 15/week @ 2024-09-29 37/week @ 2024-10-06 6/week @ 2024-10-13 21/week @ 2024-10-20 63/week @ 2024-10-27 59/week @ 2024-11-03 39/week @ 2024-11-10

182 downloads per month
Used in 2 crates

MIT license

82KB
2K SLoC

fjson

A Rust library for parsing and formatting JSON with C-style comments and trailing commas

Usage

Given the following input:

// This is a JSON value with comments and trailing commas
{

    /* The project name is fjson */
    "project": "fjson",
    "language": "Rust",
    "license": [
        "MIT",
    ],


  // This project is public.
    "public": true,
}

Format to JSONC

Format to pretty JSONC, intended for human viewing:

let output = fjson::to_jsonc(input).unwrap();
println!("{}", output);

Prints:

// This is a JSON value with comments and trailing commas
{
  /* The project name is fjson */
  "project": "fjson",
  "language": "Rust",
  "license": ["MIT"],

  // This project is public.
  "public": true
}

Format to valid, pretty JSON

Format to pretty JSON, intended for human viewing:

let output = fjson::to_json(input)?;
println!("{}", output);

Prints:

{
  "project": "fjson",
  "language": "Rust",
  "license": ["MIT"],
  "public": true
}

Format to valid, compact JSON

Format to compact JSON, intended for computer consumption:

let output = fjson::to_json_compact(input)?;
println!("{}", output);

Prints:

{"project":"fjson","language":"Rust","license":["MIT"],"public":true}

Deserialize with Serde

To parse JSON with C-style comments and trailing commas, but deserialize via serde, this can be accomplished with the following:

use serde::Deserialize;

#[derive(Debug, Deserialize)]
struct Project {
    project: String,
    language: String,
    license: Vec<String>,
    public: bool,
}

let output = fjson::to_json_compact(input)?;
let project: Project = serde_json::from_str(&output)?;
println!("{:#?}", project);

Dependencies

~69KB