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IC Reactor

IC Reactor is a type-safe TypeScript library for calling Internet Computer (ICP) canisters from web apps. It wraps `@icp-sdk/core` agents with TanStack Query caching, React hooks and reusable query/mutation objects, Internet Identity sign-in, runtime Candid parsing, and code generation from `.did` files.

Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-25T22:46:45.469Z. Cached copy · Source on b3pay.net

# IC Reactor

> IC Reactor is a type-safe TypeScript library for calling Internet Computer (ICP) canisters from web apps. It wraps `@icp-sdk/core` agents with TanStack Query caching, React hooks and reusable query/mutation objects, Internet Identity sign-in, runtime Candid parsing, and code generation from `.did` files.

Install `@ic-reactor/react` in a React app and `@ic-reactor/core` anywhere else; `@ic-reactor/react` re-exports all of core. Start with `defineReactor(...)`, or `defineDisplayReactor(...)` when the UI should get strings instead of `bigint` and `Principal`. In a server-rendered app, build it per request with `createReactorProvider(...)`. Call query methods through query hooks or query objects, and state-changing update methods only through mutations. Hooks run only in React components; loaders, actions and scripts use `.fetch()`, `.execute()`, `.invalidate()` and `reactor.callMethod()`.

This file is published from the main branch, so it can describe changes that no release carries yet. Each installed package carries a short guide for its own API at `node_modules/@ic-reactor/<package>/llms.txt`, which matches the installed version. The complete guide, with setup choices, snippets and the mistakes to avoid, is [llms-full.txt](https://ic-reactor.b3pay.net/llms-full.txt). What changed between releases is in the [changelog](https://github.com/B3Pay/ic-reactor/blob/main/CHANGELOG.md).

Package versions this guide describes:

- `@ic-reactor/core`: `3.13.0`
- `@ic-reactor/react`: `3.13.0`
- `@ic-reactor/candid`: `3.13.0`
- `@ic-reactor/codegen`: `0.15.1`
- `@ic-reactor/cli`: `0.15.1`
- `@ic-reactor/vite-plugin`: `0.15.1`
- `@ic-reactor/parser`: `0.6.0`

## Getting started

- [Installation](https://ic-reactor.b3pay.net/v3/getting-started/installation.md): packages for React and non-React apps, optional tooling, `@icp-sdk/auth`, TypeScript and bundler settings
- [Quick Start](https://ic-reactor.b3pay.net/v3/getting-started/quick-start.md): a Vite app with generated hooks, from install to the first query and mutation
- [React Setup](https://ic-reactor.b3pay.net/v3/framework/react-setup.md): `ClientManager` + `Reactor` + hooks, auth hooks, protected routes, several canisters, and server rendering
- [Local Development](https://ic-reactor.b3pay.net/v3/getting-started/local-development.md): local replica, `ic_env` cookie, root key, Codespaces and Gitpod

## Guides

- [Queries](https://ic-reactor.b3pay.net/v3/framework/queries.md): query hooks, `skipToken` for args not known yet, suspense and infinite queries, update methods in queries
- [Mutations](https://ic-reactor.b3pay.net/v3/framework/mutations.md): mutation hooks and objects, `invalidateQueries`, optimistic updates, retries
- [Query Caching](https://ic-reactor.b3pay.net/v3/framework/query-caching.md): query keys, invalidation, cache reads and writes, `QueryClient` defaults
- [Authentication](https://ic-reactor.b3pay.net/v3/guides/authentication.md): Internet Identity sign-in with `Authent
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