solana-program-library/token/js/README.md

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# Token JavaScript API
The Token JavaScript library comprises:
* A library to interact with the on-chain program
* A test client that exercises the program
* Scripts to facilitate building the program
## Getting Started
First fetch the npm dependencies, including `@solana/web3.js`, by running:
```bash
$ npm install
```
### Select a Network
The client connects to a local Solana cluster by default.
To enable on-chain program logs, set the `RUST_LOG` environment variable:
```bash
$ export RUST_LOG=solana_runtime::native_loader=trace,solana_runtime::system_instruction_processor=trace,solana_runtime::bank=debug,solana_bpf_loader=debug,solana_rbpf=debug
```
To start a local Solana cluster run:
```bash
$ solana-test-validator
```
Solana cluster logs are available with:
```bash
$ solana --url http://127.0.0.1:8899/ logs
```
### Build the on-chain program
```bash
$ npm run build:program
```
### Run the test client
```bash
$ npm run start
```
## Pointing to a public Solana cluster
Solana maintains three public clusters:
- `devnet` - Development cluster with airdrops enabled
- `testnet` - Tour De Sol test cluster without airdrops enabled
- `mainnet-beta` - Main cluster
Use npm scripts to configure which cluster.
To point to `devnet`:
```bash
$ npm run cluster:devnet
```
To point back to the local cluster:
```bash
$ npm run cluster:localnet
```