# cosmiconfig/cosmiconfig

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4,154 stars · 143 forks · TypeScript · MIT

## Links

- GitHub: https://github.com/cosmiconfig/cosmiconfig
- awesome-repositories: https://awesome-repositories.com/repository/cosmiconfig-cosmiconfig.md

## Description

Cosmiconfig is a Node.js configuration loader used to find and load application settings from package manifests, rc files, and TypeScript modules. It functions as a directory-tree search tool and multi-format config parser that converts settings into JavaScript objects.

The system distinguishes itself through a configuration transformation engine that supports merging base configurations and applying custom functions to parsed results. It employs a memoized transformation cache to store these results in memory, reducing filesystem overhead and avoiding repeated expensive computations.

The library covers broad capability areas including multi-format parsing for JSON, YAML, JS, and TypeScript, as well as upward-traversal directory search for locating files based on custom naming patterns. It also provides a pluggable parser interface to support non-standard file formats via user-defined loader functions.

## Tags

### Development Tools & Productivity

- [Application Configuration Management](https://awesome-repositories.com/f/development-tools-productivity/application-configuration-management.md) — Provides centralized management of application settings by loading and merging diverse files and formats into a unified object.
- [Configuration Discovery Tools](https://awesome-repositories.com/f/development-tools-productivity/configuration-discovery-tools.md) — Functions as a directory-tree search tool that traverses the filesystem upwards to locate configuration files.
- [Configuration Discovery](https://awesome-repositories.com/f/development-tools-productivity/file-discovery-rules/configuration-discovery.md) — Searches the directory tree upwards from a starting point to locate configuration files using a defined strategy. ([source](https://github.com/cosmiconfig/cosmiconfig/blob/main/CHANGELOG.md))
- [Hierarchical Configuration Search](https://awesome-repositories.com/f/development-tools-productivity/hierarchical-configuration-search.md) — Implements a hierarchical search to find the closest configuration file by traversing the directory tree upwards.
- [Tool Behavior Configurations](https://awesome-repositories.com/f/development-tools-productivity/tool-behavior-configurations.md) — Manages developer tool settings via rc files or package manifests to ensure consistency across environments.
- [Upward Directory Traversals](https://awesome-repositories.com/f/development-tools-productivity/upward-directory-traversals.md) — Implements an upward-traversal search to find the nearest configuration file relative to the project root.
- [Configuration Inheritance](https://awesome-repositories.com/f/development-tools-productivity/configuration-inheritance.md) — Supports merging local configuration files with shared base files to maintain consistent defaults across projects. ([source](https://github.com/cosmiconfig/cosmiconfig#readme))
- [Configuration Search Patterns](https://awesome-repositories.com/f/development-tools-productivity/configuration-search-patterns.md) — Allows definition of specific filenames or patterns to be used during the configuration file search process. ([source](https://github.com/cosmiconfig/cosmiconfig/blob/main/CHANGELOG.md))
- [Transformation Engines](https://awesome-repositories.com/f/development-tools-productivity/cross-platform-build-targets/target-specific-build-settings/build-configurations/configuration-transformations/transformation-engines.md) — Includes a transformation engine that applies custom functions to parsed configuration and caches the results.
- [Custom Configuration Loaders](https://awesome-repositories.com/f/development-tools-productivity/custom-configuration-loaders.md) — Provides a mechanism to extend the loading process with user-defined functions for non-standard file formats. ([source](https://github.com/cosmiconfig/cosmiconfig/blob/main/CHANGELOG.md))
- [Extension-Based Loader Mappings](https://awesome-repositories.com/f/development-tools-productivity/extension-based-loader-mappings.md) — Implements a mapping system that connects file extensions to their corresponding parsing functions for formats like YAML and JSON.
- [Value Extraction](https://awesome-repositories.com/f/development-tools-productivity/package-manifests/value-extraction.md) — Retrieves specific configuration values from properties or nested paths within a project's package manifest. ([source](https://github.com/cosmiconfig/cosmiconfig/blob/main/CHANGELOG.md))
- [Property Extraction](https://awesome-repositories.com/f/development-tools-productivity/project-manifest-configurations/property-extraction.md) — Enables retrieval of specific configuration objects nested within project manifest files such as package.json.

### Programming Languages & Runtimes

- [Node.js Application Configurations](https://awesome-repositories.com/f/programming-languages-runtimes/node-js-application-configurations.md) — Provides a comprehensive library for finding and loading application settings within the Node.js runtime.
- [Multi-Format Config Parsers](https://awesome-repositories.com/f/programming-languages-runtimes/json-parsing/parsing-configuration-files/multi-format-config-parsers.md) — Parses configuration settings from multiple formats like JSON, YAML, and TypeScript into JavaScript objects.
- [Multi-Format Configuration Loading](https://awesome-repositories.com/f/programming-languages-runtimes/multi-format-configuration-loading.md) — Loads application settings from diverse formats including JSON, YAML, JavaScript, and TypeScript. ([source](https://github.com/cosmiconfig/cosmiconfig/blob/main/CHANGELOG.md))

### DevOps & Infrastructure

- [Multi-Source Configuration Loaders](https://awesome-repositories.com/f/devops-infrastructure/configuration-management/file-based-configuration/configuration-file-loading/multi-source-configuration-loaders.md) — Reads configuration settings from multiple heterogeneous sources such as package manifests, rc files, and TypeScript modules. ([source](https://github.com/cosmiconfig/cosmiconfig/blob/main/package.json))

### Software Engineering & Architecture

- [Hierarchical Configuration Merging](https://awesome-repositories.com/f/software-engineering-architecture/runtime-configuration-overrides/layer-based-configuration-overrides/hierarchical-configuration-merging.md) — Provides mechanisms for merging local settings with inherited base configurations to resolve final application options.
- [Memoization Caches](https://awesome-repositories.com/f/software-engineering-architecture/memoization-caches.md) — Uses a memoized cache to store the results of expensive parsing and transformation operations in memory.
- [Pluggable Parsers](https://awesome-repositories.com/f/software-engineering-architecture/syntax-tree-analysis/language-syntax-parsers/pluggable-parsers.md) — Offers a pluggable parser interface that allows users to register custom loader functions for non-standard file formats.

### Data & Databases

- [Configuration Lookup Caches](https://awesome-repositories.com/f/data-databases/filesystem-cache-stores/file-lookup-caches/configuration-lookup-caches.md) — Implements in-memory caching of filesystem reads and configuration resolutions to reduce repeated I/O overhead. ([source](https://github.com/cosmiconfig/cosmiconfig#readme))
- [Computational Result Caching](https://awesome-repositories.com/f/data-databases/key-value-stores/response-caching/computational-result-caching.md) — Caches the output of configuration transformation functions to avoid repeated expensive computations. ([source](https://github.com/cosmiconfig/cosmiconfig#readme))