eslint-plugin-json enhances ESLint's capabilities by adding linting rules specifically tailored for JSON and JSONC files. It helps maintain code quality and consistency within JSON data by enforcing best practices, identifying syntax errors, and ensuring proper formatting. This plugin supports features like validating JSON structure, detecting duplicate keys, and enforcing indentation rules. By integrating eslint-plugin-json into your ESLint configuration, developers streamline the JSON validation process, improving the overall reliability and readability of their applications.