src/lib/types/collection.ts

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+/**
+ * Generic collection API response model
+ * Use this for APIs that return collections of items
+ *
+ * @template T - The type of items in the collection array
+ * @template K - The key used to access the collection array in the response
+ */
+export type CollectionApiModel<T, K extends string = 'items'> = Record<K, T[]> & {
+    /**
+     * Number of items returned in the current page/response
+     */
+    count: number;
+    /**
+     * Total number of items available across all pages
+     */
+    count_total: number;
+    /**
+     * Indicates if there are more items available beyond this page
+     */
+    has_more: boolean;
+};

src/lib/types/common.ts

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+/**
+ * Model of response with error
+ */
+export interface ApiErrorResponse {
+    /**
+     * Error text
+     */
+    error: string;
+    /**
+     * Status
+     */
+    status: number;
+    /**
+     * Status text
+     */
+    statusText: string;
+}
+
+/**
+ * Model of response with success
+ */
+export interface ApiSuccessResponse<T> {
+    /**
+     * Data
+     */
+    data: T;
+    /**
+     * Status
+     */
+    status: number;
+    /**
+     * Status text
+     */
+    statusText: string;
+}
+
+export type ApiResponse<T> = ApiErrorResponse | ApiSuccessResponse<T>;

src/lib/types/fontshare_fonts.ts

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+import type { CollectionApiModel } from './collection';
+
+/**
+ * Model of Fontshare API response
+ * @see https://fontshare.com
+ */
+export type FontshareApiModel = CollectionApiModel<FontshareFont>;
+
+/**
+ * Individual font metadata from Fontshare API
+ */
+export interface FontshareFont {
+    /**
+     * Unique identifier for the font
+     * UUID v4 format (e.g., "20e9fcdc-1e41-4559-a43d-1ede0adc8896")
+     */
+    id: string;
+
+    /**
+     * Display name of the font family
+     * Examples: "Satoshi", "General Sans", "Clash Display"
+     */
+    name: string;
+
+    /**
+     * Native/localized name of the font (if available)
+     * Often null for Latin-script fonts
+     */
+    native_name: string | null;
+
+    /**
+     * URL-friendly identifier for the font
+     * Used in URLs: e.g., "satoshi", "general-sans", "clash-display"
+     */
+    slug: string;
+
+    /**
+     * Font category classification
+     * Examples: "Sans", "Serif", "Display", "Script"
+     */
+    category: string;
+
+    /**
+     * Script/writing system supported by the font
+     * Examples: "latin", "arabic", "devanagari"
+     */
+    script: string;
+
+    /**
+     * Font publisher/foundry information
+     */
+    publisher: FontsharePublisher;
+
+    /**
+     * Array of designers who created this font
+     * Multiple designers may have collaborated on a single font
+     */
+    designers: FontshareDesigner[];
+
+    /**
+     * Related font families (if any)
+     * Often null, as fonts are typically independent
+     */
+    related_families: string | null;
+
+    /**
+     * Whether to display publisher as the designer instead of individual designers
+     */
+    display_publisher_as_designer: boolean;
+
+    /**
+     * Whether trial downloads are enabled for this font
+     */
+    trials_enabled: boolean;
+
+    /**
+     * Whether to show Latin-specific metrics
+     */
+    show_latin_metrics: boolean;
+
+    /**
+     * Type of license for this font
+     * Examples: "itf_ffl" (ITF Free Font License)
+     */
+    license_type: string;
+
+    /**
+     * Comma-separated list of languages supported by this font
+     * Example: "Afar, Afrikaans, Albanian, Aranese, Aromanian, Aymara, ..."
+     */
+    languages: string;
+
+    /**
+     * ISO 8601 timestamp when the font was added to Fontshare
+     * Format: "2021-03-12T20:49:05Z"
+     */
+    inserted_at: string;
+
+    /**
+     * HTML-formatted story/description about the font
+     * Contains marketing text, design philosophy, and usage recommendations
+     */
+    story: string;
+
+    /**
+     * Version of the font family
+     * Format: "1.0", "1.2", etc.
+     */
+    version: string;
+
+    /**
+     * Total number of times this font has been viewed
+     */
+    views: number;
+
+    /**
+     * Number of views in the recent time period
+     */
+    views_recent: number;
+
+    /**
+     * Whether this font is marked as "hot"/trending
+     */
+    is_hot: boolean;
+
+    /**
+     * Whether this font is marked as new
+     */
+    is_new: boolean;
+
+    /**
+     * Whether this font is in the shortlisted collection
+     */
+    is_shortlisted: boolean | null;
+
+    /**
+     * Whether this font is marked as top/popular
+     */
+    is_top: boolean;
+
+    /**
+     * Variable font axes (for variable fonts)
+     * Empty array [] for static fonts
+     */
+    axes: FontshareAxis[];
+
+    /**
+     * Tags/categories for this font
+     * Examples: ["Magazines", "Branding", "Logos", "Posters"]
+     */
+    font_tags: FontshareTag[];
+
+    /**
+     * OpenType features available in this font
+     */
+    features: FontshareFeature[];
+
+    /**
+     * Array of available font styles/variants
+     * Each style represents a different font file (weight, italic, variable)
+     */
+    styles: FontshareStyle[];
+}
+
+/**
+ * Publisher/foundry information
+ */
+export interface FontsharePublisher {
+    /**
+     * Description/bio of the publisher
+     * Example: "Indian Type Foundry (ITF) creates retail and custom multilingual fonts..."
+     */
+    bio: string;
+
+    /**
+     * Publisher email (if available)
+     */
+    email: string | null;
+
+    /**
+     * Unique publisher identifier
+     * UUID format
+     */
+    id: string;
+
+    /**
+     * Publisher links (social media, website, etc.)
+     */
+    links: FontshareLink[];
+
+    /**
+     * Publisher name
+     * Example: "Indian Type Foundry"
+     */
+    name: string;
+}
+
+/**
+ * Designer information
+ */
+export interface FontshareDesigner {
+    /**
+     * Designer bio/description
+     */
+    bio: string;
+
+    /**
+     * Designer links (Twitter, website, etc.)
+     */
+    links: FontshareLink[];
+
+    /**
+     * Designer name
+     */
+    name: string;
+}
+
+/**
+ * Link information
+ */
+export interface FontshareLink {
+    /**
+     * Name of the link platform/site
+     * Examples: "Twitter", "GitHub", "Website"
+     */
+    name: string;
+
+    /**
+     * URL of the link (may be null)
+     */
+    url: string | null;
+}
+
+/**
+ * Font tag/category
+ */
+export interface FontshareTag {
+    /**
+     * Tag name
+     * Examples: "Magazines", "Branding", "Logos", "Posters"
+     */
+    name: string;
+}
+
+/**
+ * OpenType feature
+ */
+export interface FontshareFeature {
+    /**
+     * Feature name (descriptive name or null)
+     * Examples: "Alternate t", "All Alternates", or null
+     */
+    name: string | null;
+
+    /**
+     * Whether this feature is on by default
+     */
+    on_by_default: boolean;
+
+    /**
+     * OpenType feature tag (4-character code)
+     * Examples: "ss01", "frac", "liga", "aalt", "case"
+     */
+    tag: string;
+}
+
+/**
+ * Variable font axis (for variable fonts)
+ * Defines the range and properties of a variable font axis (e.g., weight)
+ */
+export interface FontshareAxis {
+    /**
+     * Name of the axis
+     * Example: "wght" (weight axis)
+     */
+    name: string;
+
+    /**
+     * CSS property name for the axis
+     * Example: "wght"
+     */
+    property: string;
+
+    /**
+     * Default value for the axis
+     * Example: 420.0, 650.0, 700.0
+     */
+    range_default: number;
+
+    /**
+     * Minimum value for the axis
+     * Example: 300.0, 100.0, 200.0
+     */
+    range_left: number;
+
+    /**
+     * Maximum value for the axis
+     * Example: 900.0, 700.0, 800.0
+     */
+    range_right: number;
+}
+
+/**
+ * Individual font style/variant
+ * Each style represents a single downloadable font file
+ */
+export interface FontshareStyle {
+    /**
+     * Unique identifier for this style
+     * UUID format
+     */
+    id: string;
+
+    /**
+     * Whether this is the default style for the font family
+     * Typically, one style per font is marked as default
+     */
+    default: boolean;
+
+    /**
+     * CDN URL to the font file
+     * Protocol-relative URL: "//cdn.fontshare.com/wf/..."
+     * Note: URL starts with "//" (protocol-relative), may need protocol prepended
+     */
+    file: string;
+
+    /**
+     * Whether this style is italic
+     * false for upright, true for italic styles
+     */
+    is_italic: boolean;
+
+    /**
+     * Whether this is a variable font
+     * Variable fonts have adjustable axes (weight, slant, etc.)
+     */
+    is_variable: boolean;
+
+    /**
+     * Typography properties for this style
+     * Contains measurements like cap height, x-height, ascenders/descenders
+     * May be empty object {} for some styles
+     */
+    properties: FontshareStyleProperties | Record<string, never>;
+
+    /**
+     * Weight information for this style
+     */
+    weight: FontshareWeight;
+}
+
+/**
+ * Typography/measurement properties for a font style
+ */
+export interface FontshareStyleProperties {
+    /**
+     * Distance from baseline to the top of ascenders
+     * Example: 1010, 990, 1000
+     */
+    ascending_leading: number | null;
+
+    /**
+     * Height of uppercase letters (cap height)
+     * Example: 710, 680, 750
+     */
+    cap_height: number | null;
+
+    /**
+     * Distance from baseline to the bottom of descenders (negative value)
+     * Example: -203, -186, -220
+     */
+    descending_leading: number | null;
+
+    /**
+     * Body height of the font
+     * Often null in Fontshare data
+     */
+    body_height: number | null;
+
+    /**
+     * Maximum character width in the font
+     * Example: 1739, 1739, 1739
+     */
+    max_char_width: number | null;
+
+    /**
+     * Height of lowercase x-height
+     * Example: 480, 494, 523
+     */
+    x_height: number | null;
+
+    /**
+     * Maximum Y coordinate (top of ascenders)
+     * Example: 1010, 990, 1026
+     */
+    y_max: number | null;
+
+    /**
+     * Minimum Y coordinate (bottom of descenders)
+     * Example: -240, -250, -280
+     */
+    y_min: number | null;
+}
+
+/**
+ * Weight information for a font style
+ */
+export interface FontshareWeight {
+    /**
+     * Display label for the weight
+     * Examples: "Light", "Regular", "Bold", "Variable", "Variable Italic"
+     */
+    label: string;
+
+    /**
+     * Internal name for the weight
+     * Examples: "Light", "Regular", "Bold", "Variable", "VariableItalic"
+     */
+    name: string;
+
+    /**
+     * Native/localized name for the weight (if available)
+     * Often null for Latin-script fonts
+     */
+    native_name: string | null;
+
+    /**
+     * Numeric weight value
+     * Examples: 300, 400, 700, 0 (for variable fonts), 1, 2
+     * Note: This matches the `weight` property
+     */
+    number: number;
+
+    /**
+     * Numeric weight value (duplicate of `number`)
+     * Appears to be redundant with `number` field
+     */
+    weight: number;
+}

src/lib/types/google_fonts.ts

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+/**
+ * Model of google fonts api response
+ */
+export interface GoogleFontsApiModel {
+    /**
+     * Array of font items returned by the Google Fonts API
+     * Contains all font families matching the requested query parameters
+     */
+    items: FontItem[];
+}
+
+export interface FontItem {
+    /**
+     * Font family name (e.g., "Roboto", "Open Sans", "Lato")
+     * This is the name used in CSS font-family declarations
+     */
+    family: string;
+
+    /**
+     * Font category classification (e.g., "sans-serif", "serif", "display", "handwriting", "monospace")
+     * Useful for grouping and filtering fonts by style
+     */
+    category: string;
+
+    /**
+     * Available font variants for this font family
+     * Array of strings representing available weights and styles
+     * Examples: ["regular", "italic", "100", "200", "300", "400", "500", "600", "700", "800", "900", "100italic", "900italic"]
+     * The keys in the `files` object correspond to these variant values
+     */
+    variants: FontVariant[];
+
+    /**
+     * Supported character subsets for this font
+     * Examples: ["latin", "latin-ext", "cyrillic", "greek", "arabic", "devanagari", "vietnamese", "hebrew", "thai", etc.]
+     * Determines which character sets are included in the font files
+     */
+    subsets: string[];
+
+    /**
+     * Font version identifier
+     * Format: "v" followed by version number (e.g., "v31", "v20", "v1")
+     * Used to track font updates and cache busting
+     */
+    version: string;
+
+    /**
+     * Last modification date of the font
+     * Format: ISO 8601 date string (e.g., "2024-01-15", "2023-12-01")
+     * Indicates when the font was last updated by the font foundry
+     */
+    lastModified: string;
+
+    /**
+     * Mapping of font variants to their downloadable URLs
+     * Keys correspond to values in the `variants` array
+     * Examples:
+     * - "regular" → "https://fonts.gstatic.com/s/roboto/v30/KFOmCnqEu92Fr1Me4W..."
+     * - "700" → "https://fonts.gstatic.com/s/roboto/v30/KFOlCnqEu92Fr1MmWUlf..."
+     * - "700italic" → "https://fonts.gstatic.com/s/roboto/v30/KFOjCnqEu92Fr1Mu51TzA..."
+     */
+    files: FontFiles;
+
+    /**
+     * URL to the font menu preview image
+     * Typically a PNG showing the font family name in the font
+     * Example: "https://fonts.gstatic.com/l/font?kit=KFOmCnqEu92Fr1Me4W...&s=i2"
+     */
+    menu: string;
+}
+
+/**
+ * Standard font weights that can appear in Google Fonts API
+ */
+export type FontWeight = '100' | '200' | '300' | '400' | '500' | '600' | '700' | '800' | '900';
+
+/**
+ * Italic variant format: e.g., "100italic", "400italic", "700italic"
+ */
+export type FontWeightItalic = `${FontWeight}italic`;
+
+/**
+ * All possible font variants in Google Fonts API
+ * - Numeric weights: "400", "700", etc.
+ * - Italic variants: "400italic", "700italic", etc.
+ * - Legacy names: "regular", "italic", "bold", "bolditalic"
+ */
+export type FontVariant =
+    | FontWeight
+    | FontWeightItalic
+    | 'regular'
+    | 'italic'
+    | 'bold'
+    | 'bolditalic';
+
+/**
+ * Google Fonts API file mapping
+ * Dynamic keys that match the variants array
+ *
+ * Examples:
+ * - { "regular": "...", "italic": "...", "700": "...", "700italic": "..." }
+ * - { "400": "...", "400italic": "...", "900": "..." }
+ */
+export type FontFiles = Partial<Record<FontVariant, string>>;