@felipecrs/jsonc-weaver

Modify JSONC files programmatically while preserving comments and formatting.

Usage

Parse your JSONC with any parser, modify the object, then weave the changes back.

original.jsonc:

{
  // Application settings
  "name": "my-app",
  "version": "1.0.0",
  /* Multi-line
     comment */
  "features": ["auth", "api"],
  "database": {
    "host": "localhost",
    "port": 5432 // Default port
  },
  "oldSetting": "remove-me"
}

Code:

import { parse, weave } from "@felipecrs/jsonc-weaver";

const data = parse(await Deno.readTextFile("original.jsonc"));

// Modify properties
data.name = "awesome-app";
data.version = "2.0.0";

// Change nested values
data.database.port = 3306;

// Modify arrays
data.features.push("logging");

// Remove properties
delete data.oldSetting;

// Add new properties
data.newSetting = "added";

const result = weave(original, data);

await Deno.writeTextFile("result.jsonc", result);

result.jsonc:

{
  // Application settings
  "name": "awesome-app",
  "version": "2.0.0",
  /* Multi-line
     comment */
  "features": ["auth", "api", "logging"],
  "database": {
    "host": "localhost",
    "port": 3306
  },
  "newSetting": "added"
}

[!IMPORTANT] The order of properties in the modified object will determine their order in the output JSONC. Avoid reordering properties in your code to maintain the original order.

Credits

This project is powered by @david/jsonc-morph.