anchor-parser

Generate Rust types and helpers from Anchor IDL JSON files using solana-sdk types directly — no anchor-lang dependency required.

Features

• Accounts — Structs with discriminator constants and deserialization (Borsh & bytemuck/zero-copy).
• Events — Structs with from_logs (emit!) and from_cpi_logs (emit_cpi!) parsers.
• Instructions — Builder functions that return solana_sdk::instruction::Instruction.
• Types — Shared structs, enums, and type aliases from the IDL.
• Constants — Program constants with doc comments.
• Utils — Event and Account wrapper enums for generic parsing across all program types.

Installation

[dependencies]
anchor-parser = "2.0.0"

Quick start

1. Place an Anchor IDL JSON file in an idls/ directory at your crate root:

my-crate/
├── Cargo.toml
├── idls/
│   └── my_program.json
└── src/
    └── main.rs

2. Declare the program:

use anchor_parser::declare_program;

declare_program!(my_program);

This generates a my_program module with the following sub-modules:

The program ID is available as my_program::ID.

Usage

Accounts

use my_program::accounts::MyAccount;

// Deserialize from raw account data (discriminator + payload)
let account = MyAccount::from_account_data(&raw_bytes)?;

// Check discriminator
assert_eq!(MyAccount::DISCRIMINATOR, [/* 8 bytes */]);

Events

use my_program::events::SwapEvent;

// Parse events from emit! logs (base64-encoded "Program data:" log lines)
let events = SwapEvent::from_logs(&log_messages);

// Parse events from emit_cpi! inner instruction data (bs58-encoded)
let cpi_events = SwapEvent::from_cpi_logs(&inner_instruction_data);

Both methods accept any IntoIterator<Item = I> where I: AsRef<str> — vec, slice, array, iterator, &[String], &[&str], etc.

Event & Account enums

The utils module provides wrapper enums that try all known discriminators:

use my_program::utils::{Event, Account};

// Parse any program event from logs
let events: Vec<Event> = Event::from_logs(&log_messages);
let events: Vec<Event> = Event::from_cpi_logs(&log_messages);

match &events[0] {
    Event::SwapEvent(e) => println!("swap amount: {}", e.amount_0),
    Event::PoolCreatedEvent(e) => println!("new pool: {}", e.pool_state),
    _ => {}
}

// Parse any program account from raw data
let account: Account = Account::parse(&raw_bytes)?;

Instructions

use my_program::instructions;

let ix = instructions::swap(
    &my_program::ID,
    &instructions::SwapAccounts {
        payer: wallet.pubkey(),
        pool_state: pool_address,
        // ...
    },
    amount,
    min_out,
);
// ix: solana_sdk::instruction::Instruction

Constants

use my_program::constants;

let fee = constants::FEE_DENOMINATOR; // u64
let prefix = constants::POOL_PREFIX;  // &[u8]

from_logs vs from_cpi_logs

Both methods share the same generic signature:

pub fn from_logs<T, I>(logs: T) -> Vec<Self>
where
    T: IntoIterator<Item = I>,
    I: AsRef<str>,

How emit_cpi! events work

Anchor's emit_cpi! emits events as self-CPI inner instructions. The instruction data is laid out as:

[8 bytes: Anchor CPI event tag] [8 bytes: event discriminator] [borsh payload]

To use from_cpi_logs, pass the bs58-encoded inner instruction data strings (not log messages) from instructions targeting your program.

Supported serialization formats

IDL compatibility

Supports the Anchor IDL JSON format. The IDL file name (without .json) becomes the Rust module name.

Tests

cargo test

The test suite covers four real-world programs (306 tests total):

License

MIT