# manish-9245/purchasing-power-parity-advanced architecture

> Architecture diagram of the GitHub repository manish-9245/purchasing-power-parity-advanced, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-07-31). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/manish-9245/purchasing-power-parity-advanced
- Repository: https://github.com/manish-9245/purchasing-power-parity-advanced

## Overview

#### Purpose and Entry Points
This is a compact Node.js package providing purchasing-power-parity (PPP) currency conversions across ISO3 country codes. It supports both a CommonJS programmatic API and a globally installed CLI command (`ppp-calculator`).

The implementation is centralized in `index.js`; package exposure, CLI bin mapping, dependencies, and runtime metadata are expected in `package.json`.

#### Public API Boundary
`index.js` exports three consumer-facing operations:
- `convertPPP(originCode, amount, targetCodes, options)` — asynchronous multi-country PPP conversion.
- `listCountries()` — asynchronous list of supported ISO3 PPP codes.
- `listCountryCodes()` — country code/name lookup data.

The module boundary is CommonJS (`require('purchasing-power-parity-advanced')`), making `index.js` the single integration point for library users.

Paths: `index.js`, `package.json`

#### CLI Execution Path
The CLI accepts an origin ISO3 code, numeric amount, and comma-separated target ISO3 codes. It invokes the same conversion capability as the module API, but always emits flags and country names in JSON output.

The CLI is likely implemented or dispatched from `index.js`, with the executable command registration defined through `package.json`.

Paths: `index.js`, `package.json`

#### Conversion Pipeline
The core flow is:
1. Normalize/validate origin and target ISO3 country codes.
2. Resolve PPP data for origin and each requested target.
3. Calculate target purchasing-power-equivalent amounts relative to the origin amount.
4. Enrich origin and result records with currency metadata, optional country names, and optional flags.
5. Return one origin record plus an ordered array of target result records.

A target may produce `amount: null` when conversion data is unavailable, while metadata fields are independently nullable.

Paths: `index.js`

#### Country and Currency Metadata
Country lookup is a separate logical concern from PPP arithmetic: callers can retrieve ISO3/ISO2/name records without performing a conversion. Conversion responses additionally expose currency code, name, and symbol, and conditionally include visual/country-name presentation fields.

This design supports a data-oriented API response rather than returning only numeric conversions.

Paths: `index.js`

#### Runtime and External Dependencies
The package runs on Node.js and is distributed through npm. Dependency resolution is pinned by `package-lock.json`; runtime dependencies and the CLI executable declaration are defined by `package.json`.

No separate service, database, frontend, or infrastructure layer is present in the repository tree. Any external PPP data source or country/currency dataset dependency must therefore be consumed directly by the single module implementation or installed npm dependencies.

Paths: `package.json`, `package-lock.json`, `index.js`

Main entry points: [`index.js`](https://github.com/manish-9245/purchasing-power-parity-advanced/blob/main/index.js) (ppp-calculator), [`package.json`](https://github.com/manish-9245/purchasing-power-parity-advanced/blob/main/package.json) (Package manifest), [`package-lock.json`](https://github.com/manish-9245/purchasing-power-parity-advanced/blob/main/package-lock.json) (Dependency lockfile)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_consumers["Consumers"]
  node_library_user(("CommonJS consumer"))
  node_cli_user(("CLI user<br/>consumer"))
end

subgraph group_package["npm Package"]
  node_npm{{"npm distribution<br/>registry"}}
  node_package_manifest["Package manifest<br/>npm manifest<br/>[package.json]"]
  node_lockfile["Dependency lockfile<br/>npm lockfile<br/>[package-lock.json]"]
  node_cli_command["ppp-calculator<br/>CLI command<br/>[index.js]"]
end

subgraph group_conversion["Conversion Engine"]
  node_module_api["Public CommonJS API<br/>module exports<br/>[index.js]"]
  node_code_validation["ISO3 normalization<br/>validation layer<br/>[index.js]"]
  node_ppp_resolution[("PPP data resolution<br/>data access<br/>[index.js]")]
  node_ppp_calculation["PPP calculation<br/>calculation layer<br/>[index.js]"]
  node_metadata_lookup["Country &amp; currency metadata<br/>metadata layer<br/>[index.js]"]
  node_conversion_response["Conversion response<br/>API result<br/>[index.js]"]
  node_country_lists["Country lookup results<br/>API result<br/>[index.js]"]
end

node_npm -->|"publishes from"| node_package_manifest
node_package_manifest -->|"locks dependencies with"| node_lockfile
node_package_manifest -->|"registers bin"| node_cli_command
node_library_user -->|"require&#40;&#41;"| node_module_api
node_cli_user -->|"invokes"| node_cli_command
node_cli_command -->|"uses conversion"| node_module_api
node_module_api -->|"convertPPP"| node_code_validation
node_code_validation -->|"valid codes"| node_ppp_resolution
node_ppp_resolution -->|"PPP values"| node_ppp_calculation
node_ppp_calculation -->|"amount results"| node_metadata_lookup
node_metadata_lookup -->|"enriched records"| node_conversion_response
node_module_api -->|"listCountries / listCountryCodes"| node_country_lists
node_metadata_lookup -->|"country records"| node_country_lists
node_cli_command -->|"JSON with names and flags"| node_conversion_response

click node_package_manifest "https://github.com/manish-9245/purchasing-power-parity-advanced/blob/main/package.json"
click node_lockfile "https://github.com/manish-9245/purchasing-power-parity-advanced/blob/main/package-lock.json"
click node_cli_command "https://github.com/manish-9245/purchasing-power-parity-advanced/blob/main/index.js"
click node_module_api "https://github.com/manish-9245/purchasing-power-parity-advanced/blob/main/index.js"
click node_code_validation "https://github.com/manish-9245/purchasing-power-parity-advanced/blob/main/index.js"
click node_ppp_resolution "https://github.com/manish-9245/purchasing-power-parity-advanced/blob/main/index.js"
click node_ppp_calculation "https://github.com/manish-9245/purchasing-power-parity-advanced/blob/main/index.js"
click node_metadata_lookup "https://github.com/manish-9245/purchasing-power-parity-advanced/blob/main/index.js"
click node_conversion_response "https://github.com/manish-9245/purchasing-power-parity-advanced/blob/main/index.js"
click node_country_lists "https://github.com/manish-9245/purchasing-power-parity-advanced/blob/main/index.js"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_library_user,node_cli_user toneBlue
class node_npm,node_package_manifest,node_lockfile,node_cli_command toneAmber
class node_module_api,node_code_validation,node_ppp_resolution,node_ppp_calculation,node_metadata_lookup,node_conversion_response,node_country_lists toneMint
```

## Components

### Consumers

- **CommonJS consumer**: consumer
- **CLI user**: consumer

### npm Package

- **npm distribution**: registry
- [Package manifest](https://github.com/manish-9245/purchasing-power-parity-advanced/blob/main/package.json): npm manifest · Declares runtime dependencies and the CLI bin mapping. · `package.json`
- [Dependency lockfile](https://github.com/manish-9245/purchasing-power-parity-advanced/blob/main/package-lock.json): npm lockfile · Pins installed dependency resolution. · `package-lock.json`
- [ppp-calculator](https://github.com/manish-9245/purchasing-power-parity-advanced/blob/main/index.js): CLI command · Accepts origin, amount, and comma-separated targets. · `index.js`

### Conversion Engine

- [Public CommonJS API](https://github.com/manish-9245/purchasing-power-parity-advanced/blob/main/index.js): module exports · Exports convertPPP, listCountries, and listCountryCodes. · `index.js`
- [ISO3 normalization](https://github.com/manish-9245/purchasing-power-parity-advanced/blob/main/index.js): validation layer · Normalizes and validates origin and target country codes. · `index.js`
- [PPP data resolution](https://github.com/manish-9245/purchasing-power-parity-advanced/blob/main/index.js): data access · Resolves PPP data for the origin and requested targets. · `index.js`
- [PPP calculation](https://github.com/manish-9245/purchasing-power-parity-advanced/blob/main/index.js): calculation layer · Computes purchasing-power-equivalent target amounts. · `index.js`
- [Country & currency metadata](https://github.com/manish-9245/purchasing-power-parity-advanced/blob/main/index.js): metadata layer · Provides ISO codes, names, currency details, and optional flags. · `index.js`
- [Conversion response](https://github.com/manish-9245/purchasing-power-parity-advanced/blob/main/index.js): API result · Returns an origin record and ordered target results; unavailable amounts are null. · `index.js`
- [Country lookup results](https://github.com/manish-9245/purchasing-power-parity-advanced/blob/main/index.js): API result · Returns supported PPP codes or ISO3/ISO2/name records. · `index.js`

## Connections

- npm distribution → Package manifest: publishes from
- Package manifest → Dependency lockfile: locks dependencies with
- Package manifest → ppp-calculator: registers bin
- CommonJS consumer → Public CommonJS API: require()
- CLI user → ppp-calculator: invokes
- ppp-calculator → Public CommonJS API: uses conversion
- Public CommonJS API → ISO3 normalization: convertPPP
- ISO3 normalization → PPP data resolution: valid codes
- PPP data resolution → PPP calculation: PPP values
- PPP calculation → Country & currency metadata: amount results
- Country & currency metadata → Conversion response: enriched records
- Public CommonJS API → Country lookup results: listCountries / listCountryCodes
- Country & currency metadata → Country lookup results: country records
- ppp-calculator → Conversion response: JSON with names and flags