Steam Web API Types

A comprehensive set of TypeScript type definitions for the raw JSON responses from the official Steam Web API, with optional, ready-to-use schemas for multiple validation libraries.

This package provides accurate, up-to-date interfaces for developers making direct fetch calls to api.steampowered.com, enabling full type safety and editor autocomplete for your backend projects.

The Problem This Solves

Most existing @types packages for Steam are for specific Node.js wrapper libraries (like steamapi or steam-user), which transform the raw API response into a different format. This package is for developers who are interacting with the raw, untransformed API directly.

It provides both pure TypeScript types for static analysis and optional schemas for robust runtime validation using your favorite library.

Features

• Types: The /types entry point provides pure TypeScript types with zero runtime dependencies.
• Optional Schemas: Includes secondary entry points for multiple popular validation libraries.
• Accurate: Modeled directly from the official Steam Web API documentation.
• Organized: Types and schemas are split into files that mirror the Steam API services (e.g., ISteamUser.ts).
• Lightweight: The default import path has zero dependencies. Validation libraries are optional peer dependencies.

Supported Schemas

• ArkType
• Effect
• io-ts
• Javascript Transform
• JSON Schema
• TypeBox
• Typescript Transform
• Valibot
• Value Transform
• Yup
• Yrel
• Zod

Implemented Steam Web API Modules

• IBroadcastService
• ICloudService
• ICheatReportingService
• IEconMarketService
• IEconService
• IGameInventory
• IGameNotificationsService
• IGameServersService
• IInventoryService
• ILobbyMatchmakingService
• IPlayerService
• IPublishedFileService
• ISiteLicenseService
• ISteamApps
• ISteamCDN
• ISteamDirectory
• ISteamEconomy
• ISteamGameServerStats
• ISteamLeaderboards
• ISteamMicroTxn
• ISteamMicroTxnSandbox
• ISteamNews
• ISteamRemoteStorage
• ISteamUser
• ISteamUserAuth
• ISteamUserOAuth
• ISteamUserStats
• ISteamWebAPIUtil
• ISteamWebUserPresenceOAuth
• IStoreService
• IWorkshopService

Installation

# Using bun
bun add -D @oddlaceguy49/steam-web-api-types

# Using pnpm
pnpm add -D @oddlaceguy49/steam-web-api-types

# Using npm
npm install --save-dev @oddlaceguy49/steam-web-api-types

# Using yarn
yarn add --dev @oddlaceguy49/steam-web-api-types

Basic Usage (Types Only)

You can import pure TypeScript interfaces for type casting and function signatures. This requires no additional libraries.

import type { GetPlayerSummariesResponse } from "@oddlaceguy49/steam-web-api-types/types/ISteamUser";

async function getSummaries(apiKey: string, steamids: string[]) {
    const url = `https://api.steampowered.com/ISteamUser/GetPlayerSummaries/v2/?key=${apiKey}&steamids=${steamids.join(
        ","
    )}`;
    const response = await fetch(url);

    // Use the imported type for casting.
    const data = (await response.json()) as GetPlayerSummariesResponse;

    return data.response.players;
}

Advanced Usage with Schemas (Recommended)

For robust runtime validation, this package provides optional sets of schemas for various libraries.

1. Install your chosen library as a dependency:

# Example for Zod
bun add zod

# Example for TypeBox
bun add typebox

2. Import schemas from the corresponding entry point: Notice the import path now includes the library name (e.g., /zod, /typebox). This gives you access to the validation schemas.

Zod Example

import { GetPlayerSummariesResponseSchema } from "@oddlaceguy49/steam-web-api-types/zod/ISteamUser";
// You can still import the inferred type for function signatures if needed
import type { PlayerSummary } from "@oddlaceguy49/steam-web-api-types/ISteamUser";

async function getSummariesSafely(
    apiKey: string,
    steamids: string[]
): Promise<RawPlayerSummary[] | null> {
    const url = `https://api.steampowered.com/ISteamUser/GetPlayerSummaries/v2/?key=${apiKey}&steamids=${steamids.join(
        ","
    )}`;

    try {
        const response = await fetch(url);
        if (!response.ok) return null;

        const unknownData = await response.json();

        // Use the imported Zod schema to validate and parse the data
        const result = GetPlayerSummariesResponseSchema.safeParse(unknownData);

        if (!result.success) {
            console.error("Validation failed:", result.error.flatten());
            return null;
        }

        // result.data is now fully typed and guaranteed to be safe!
        return result.data.response.players;
    } catch (error) {
        console.error("Error fetching summaries:", error);
        return null;
    }
}

TypeBox Example

import { Type } from "@sinclair/typebox";
import { Value } from "@sinclair/typebox/value";
import { GetPlayerSummariesResponseType } from "@oddlaceguy49/steam-web-api-types/typebox/ISteamUser";
import type { PlayerSummary } from "@oddlaceguy49/steam-web-api-types/ISteamUser";

async function getSummariesWithTypeBox(
    apiKey: string,
    steamids: string[]
): Promise<RawPlayerSummary[] | null> {
    const url = `https://api.steampowered.com/ISteamUser/GetPlayerSummaries/v2/?key=${apiKey}&steamids=${steamids.join(
        ","
    )}`;

    try {
        const response = await fetch(url);
        if (!response.ok) return null;

        const unknownData = await response.json();

        // Use the imported TypeBox type to validate the data
        if (!Value.Check(GetPlayerSummariesResponseType, unknownData)) {
            console.error("Validation failed");
            return null;
        }

        // unknownData is now validated and can be safely used
        return unknownData.response.players;
    } catch (error) {
        console.error("Error fetching summaries:", error);
        return null;
    }
}

How Schemas Are Generated

The validation schemas for this project are automatically generated from the base TypeScript types located in src/types. This ensures that the schemas stay in sync with the type definitions. The generation process uses a combination of tools:

• TypeBox Codegen is the primary tool used to generate schemas for most all of the supported libraries, including:

  • Zod
  • TypeBox
  • Valibot
  • Effect
  • JSON Schema
  • Yup

  ---

  • Yup schemas are first generated with TypeBox Codegen and then programmatically modified to fix import statements, ensuring they are ready to use.

  • TypeBox schemas are notably generated using Codegen.ModelToTypeBox instead of Codegen.TypescriptToTypeBox.

This automated process is handled by the scripts/generateSchemas.ts file.

Contributing

Contributions are welcome! If you find a missing endpoint or an incorrect type/schema, please feel free to open an issue or submit a pull request on the GitHub repository.

The general workflow is:

1. Fork the repository and create a new branch.
2. Add or modify the base TypeScript types in the src/types/ directory.
3. Run the generator script to update all schema packages: bun run gen.
4. Commit your changes and submit a pull request.

License

This project is licensed under the MIT License.