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Used in 982 crates (252 directly)



Borsh in Rust   Latest Version borsh: rustc 1.55+ License Apache-2.0 badge License MIT badge

borsh-rs is Rust implementation of the Borsh binary serialization format.

Borsh stands for Binary Object Representation Serializer for Hashing. It is meant to be used in security-critical projects as it prioritizes consistency, safety, speed, and comes with a strict specification.


use borsh::{BorshSerialize, BorshDeserialize};

#[derive(BorshSerialize, BorshDeserialize, PartialEq, Debug)]
struct A {
    x: u64,
    y: String,

fn test_simple_struct() {
    let a = A {
        x: 3301,
        y: "liber primus".to_string(),
    let encoded_a = a.try_to_vec().unwrap();
    let decoded_a = A::try_from_slice(&encoded_a).unwrap();
    assert_eq!(a, decoded_a);


Opting out from Serde allows borsh to have some features that currently are not available for serde-compatible serializers. Currently we support two features: borsh_init and borsh_skip (the former one not available in Serde).

borsh_init allows to automatically run an initialization function right after deserialization. This adds a lot of convenience for objects that are architectured to be used as strictly immutable. Usage example:

#[derive(BorshSerialize, BorshDeserialize)]
struct Message {
    message: String,
    timestamp: u64,
    public_key: CryptoKey,
    signature: CryptoSignature
    hash: CryptoHash

impl Message {
    pub fn init(&mut self) {
        self.hash = CryptoHash::new().write_string(self.message).write_u64(self.timestamp);
        self.signature.verify(self.hash, self.public_key);

borsh_skip allows to skip serializing/deserializing fields, assuming they implement Default trait, similary to #[serde(skip)].

#[derive(BorshSerialize, BorshDeserialize)]
struct A {
    x: u64,
    y: f32,


The versions of all public crates in this repository are collectively managed by a single version in the workspace manifest.

So, to publish a new version of all the crates, you can do so by simply bumping that to the next "patch" version and submit a PR.

We have CI Infrastructure put in place to automate the process of publishing all crates once a version change has merged into master.

However, before you release, make sure the CHANGELOG is up to date and that the [Unreleased] section is present but empty.


This repository is distributed under the terms of both the MIT license and the Apache License (Version 2.0). See LICENSE-MIT and LICENSE-APACHE for details.


~48K SLoC