> ## Documentation Index
> Fetch the complete documentation index at: https://lightprotocol-migration.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Client Development

> Overview to Client side development. Quick access to TypeScript and Rust SDKs

Build client applications that interact with ZK Compression across web, Node.js, and native environments using our TypeScript and Rust SDKs.

## Typescript Client

* [**@lightprotocol/stateless.js**](https://www.npmjs.com/package/@lightprotocol/stateless.js) **-** Core compression SDK to create or interact with compressed accounts via RPC interface
* [**@lightprotocol/compressed-token**](https://www.npmjs.com/package/@lightprotocol/compressed-token) **-** SDK to mint, transfer, compress/ decompress, or delegate compressed tokens

## Rust Client

* For devnet and mainnet use [`light-client`](https://docs.rs/light-client)
  * An RPC client for compressed accounts and tokens. Find a [full list of JSON RPC methods here](https://www.zkcompression.com/resources/json-rpc-methods).
  * It connects to the Photon indexer that tracks compressed state to query compressed accounts and the prover service for validity proofs.
* For local testing use [`light-program-test`](https://docs.rs/light-program-test)
  * Initializes in-process Solana VM via [LiteSVM](https://github.com/LiteSVM/LiteSVM) with auto-funded payer, local prover server and in-memory indexer.
* `LightClient` and `LightProgramTest` implement the same [`Rpc`](https://docs.rs/light-client/latest/light_client/rpc/trait.Rpc.html) and [`Indexer`](https://docs.rs/light-client/latest/light_client/indexer/trait.Indexer.html) traits. Seamlessly switch between `light-program-test`, local test validator, and public Solana networks.

### Installation

<CodeGroup>
  ```bash npm theme={null}
  npm install --save \
      @lightprotocol/stateless.js \
      @lightprotocol/compressed-token \
      @solana/web3.js \
      @lightprotocol/zk-compression-cli
  ```

  ```bash Yarn theme={null}
  yarn add \
      @lightprotocol/stateless.js \
      @lightprotocol/compressed-token \
      @solana/web3.js \
      @lightprotocol/zk-compression-cli
  ```
</CodeGroup>

```toml rust-client.toml theme={null}
[dependencies]
light-client = "0.13.1"
```

### Environments

<Tabs>
  <Tab title="Localnet">
    Start a local test-validator with the below command. It will start a single-node Solana cluster, an RPC node, and a prover node at ports 8899, 8784, and 3001.

    ```bash theme={null}
    light test-validator
    ```

    See the CLI Installation Guide for more.

    <Card title="CLI Installation" icon="terminal" horizontal href="resources/cli-installation" />
  </Tab>

  <Tab title="Devnet">
    The `Rpc` connection is used to interact with the ZK Compression JSON RPC. It's a thin wrapper extending [Solana's web3.js `Connection` class](https://solana-labs.github.io/solana-web3.js/classes/Connection.html) with compression-related endpoints.

    Here's how you set up a connection:

    ```typescript theme={null}
    import { createRpc } from '@lightprotocol/stateless.js';

    // Local development
    const connection = createRpc(); // Uses local test validator

    // DevNet
    const connection = createRpc(
      "https://devnet.helius-rpc.com?api-key=YOUR_KEY",
    );

    // MainNet
    const connection = createRpc(
      "https://mainnet.helius-rpc.com?api-key=YOUR_KEY"
    );
    ```

    Find all ZK Compression related RPC methods below.

    <Card title="JSON RPC methods" icon="code-simple" horizontal href="resources/json-rpc-methods" />
  </Tab>
</Tabs>

### Examples

<CardGroup>
  <Card horizontal icon="github" title="GitHub - Lightprotocol/example-web-client" href="https://github.com/Lightprotocol/example-web-client" />

  <Card horizontal icon="github" title="GitHub - Lightprotocol/example-nodejs-client" href="https://github.com/Lightprotocol/example-nodejs-client" />
</CardGroup>

### Next Steps

Learn about SDKs for program development.