eslintrcjson

eslintrcjson refers to the JSON-based ESLint configuration file used to customize linting behavior for a project. The conventional name is .eslintrc.json, and the file is read by ESLint when it analyzes code to determine which environments, parser, plugins, and rules should apply.

The top-level structure is a JSON object with fields such as env, extends, parser, parserOptions, plugins, globals, rules, settings, and overrides. env defines predefined global variables and environments (for example browser, node, es2021). extends allows reusing shareable configurations from ESLint presets or plugins. parser specifies an alternate parser, such as @typescript-eslint/parser for TypeScript. parserOptions configures language features, including ecmaVersion, sourceType, and module features. plugins enables additional rule sets from ESLint plugins. globals declares project-level global variables and their writability. rules contains the rule set, with severities like off, warn, or error and plugin-specific options. settings provides configuration for plugins. overrides enables per-file configurations for patterns (for example *.ts or __tests__).

ESLint will look for a .eslintrc.json (or eslintrc.json) in the project root or in parent folders, and can be overridden with the --config option. Note that standard JSON does not support comments; to include comments, consider .eslintrc.js or .eslintrc.yaml. An alternative location for configuration is the eslintConfig field in package.json. ignorePatterns can also be defined in the config to ignore files by pattern (alternatively, a separate .eslintignore file is used).