rollup-plugin-json-output

A Rollup/Rolldown plugin that converts modules to JSON by serializing their default exports using JSON.stringify.

• ⚡️ Generate dynamic JSON from JavaScript configuration files
• 🔄 Seamless integration with Rollup/Rolldown build process

Requirements

• Node.js >= 25.0.0 or Deno >= 2.5.0
• Rollup >= 2.0.0 or Rolldown

Usage

Install

npm install --save-dev rollup-plugin-json-output

Example

// rollup.config.js
import { jsonOutput } from "rollup-plugin-json-output";

export default [
	{
		// Main build configuration
		input: "src/index.js",
		output: {
			dir: "dist"
		}
	}, {
		input: "manifest.config.js",
		output: {
			file: "dist/manifest.json",
		},
		plugins: [jsonOutput()]
	}
];

// manifest.config.js
import packageJson from "./package.json" with { type: "json" };

export default {
	manifest_version: 3,
	name: "my-extension",
	version: packageJson.version
};

Options

• indent: Specify the indentation of the JSON output. Set to null for no indentation.

  • Type: string | number | null
  • Default: (4 spaces)

• replacer: Transform or filter values during serialization.

  • Type: (key: string, value: unknown) => unknown | (number | string)[]
  • Default: undefined

• respectCompact: Control whether to respect the bundler's minification settings. When enabled, indent is ignored if the bundler set output.compact (Rollup) or output.minify (Rolldown) to true.

  • Type: boolean
  • Default: true

License

Copyright © 2025 yetDragon

This project is licensed under the Copyfree Open Innovation License (COIL-1.0). See LICENSE.md for details.