[Anchor](https://www.anchor-lang.com/) is a framework providing several convenient developer tools for writing Solana programs (sometimes called 'smart contracts').
- Rust eDSL for writing Solana programs
- [IDL](https://en.wikipedia.org/wiki/Interface_description_language) specification
- TypeScript package for generating clients from IDL
- CLI and workspace management for developing complete applications
Anchor is the most popular framework for Solana programs.
> [!NOTE]
> If you're familiar with developing in Ethereum's [Solidity](https://docs.soliditylang.org/en/), [Truffle](https://www.trufflesuite.com/), [web3.js](https://github.com/ethereum/web3.js), then using Anchor will be familiar. Although the DSL syntax and semantics are targeted at Solana, the high level flow of writing RPC request handlers, emitting an IDL, and generating clients from IDL is the same.
## Getting Started
For a quickstart guide and in depth tutorials, see the [Anchor documentation](https://www.anchor-lang.com/docs).
To jump straight to examples, go [here](https://github.com/otter-sec/anchor/tree/master/examples). For the latest Rust and TypeScript API documentation, see [docs.rs](https://docs.rs/anchor-lang) and the [typedoc](https://www.anchor-lang.com/docs/clients/typescript).
## Installation
The recommended way to install the Anchor CLI is with the Anchor Version Manager (AVM).
```sh
curl -sSfL https://raw.githubusercontent.com/otter-sec/anchor/master/avm/install | sh
```
The installer downloads the latest nightly AVM and Anchor CLI binaries, enables
the nightly channel, and links the `avm` and `anchor` commands into
`~/.cargo/bin` when possible. After that, `anchor` will use the latest cached
nightly build and periodically check for updates.
If you already have AVM installed, you can enable the nightly channel directly:
```sh
avm nightly
```
To leave nightly mode and return to normal AVM version resolution, run:
```sh
avm nightly --disable
```
## Packages
| Package | Description | Version | Docs |
| :---------------------- | :------------------------------------------------------- | :------------------------------------------------------------------------------------------------------------------------------- | :-------------------------------------------------------------------------------------------------------------- |
| `anchor-lang` | Rust primitives for writing programs on Solana | [](https://crates.io/crates/anchor-lang) | [](https://docs.rs/anchor-lang) |
| `anchor-spl` | CPI clients for SPL programs on Solana | [](https://crates.io/crates/anchor-spl) | [](https://docs.rs/anchor-spl) |
| `anchor-client` | Rust client for Anchor programs | [](https://crates.io/crates/anchor-client) | [](https://docs.rs/anchor-client) |
| `@anchor-lang/core` | TypeScript client for Anchor programs | [](https://www.npmjs.com/package/@anchor-lang/core) | [](https://otter-sec.github.io/anchor/ts/index.html) |
| `@anchor-lang/cli` | CLI to support building and managing an Anchor workspace | [](https://www.npmjs.com/package/@anchor-lang/cli) | [](https://www.anchor-lang.com/docs/references/cli) |
## Examples
Here's a counter program, where only the designated `authority`
can increment the count.
```rust
use anchor_lang::prelude::*;
declare_id!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");
#[program]
mod counter {
use super::*;
pub fn initialize(ctx: Context, start: u64) -> Result<()> {
let counter = &mut ctx.accounts.counter;
counter.authority = *ctx.accounts.authority.key;
counter.count = start;
Ok(())
}
pub fn increment(ctx: Context) -> Result<()> {
let counter = &mut ctx.accounts.counter;
counter.count += 1;
Ok(())
}
}
#[derive(Accounts)]
pub struct Initialize<'info> {
#[account(init, payer = authority, space = 48)]
pub counter: Account<'info, Counter>,
pub authority: Signer<'info>,
pub system_program: Program<'info, System>,
}
#[derive(Accounts)]
pub struct Increment<'info> {
#[account(mut, has_one = authority)]
pub counter: Account<'info, Counter>,
pub authority: Signer<'info>,
}
#[account]
pub struct Counter {
pub authority: Pubkey,
pub count: u64,
}
```
For more, see the [examples](https://github.com/otter-sec/anchor/tree/master/examples)
and [tests](https://github.com/otter-sec/anchor/tree/master/tests) directories.
## Fuzzing
`anchor fuzz` integrates [Crucible](https://github.com/asymmetric-research/crucible) for coverage-guided program fuzzing. See the [fuzzing docs](https://anchor-lang.com/docs/testing/fuzzing) or the [Crucible docs](https://github.com/asymmetric-research/crucible#quick-start).
```sh
# scaffold a fuzz harness
anchor fuzz init program_name
# run a fuzz test
anchor fuzz run program_name test_name --release
```
## License
Anchor is licensed under [Apache 2.0](./LICENSE).
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in Anchor by you, as defined in the Apache-2.0 license, shall be
licensed as above, without any additional terms or conditions.
This code is provided as-is, without warranties or liability.
## Contribution
Thank you for your interest in contributing to Anchor!
Please see the [CONTRIBUTING.md](./CONTRIBUTING.md) to learn how.
### Thanks ❤️
