# o1js Pack

Make the most of your zkApp state!

## What is it

o1js Pack is a library for [o1js](https://github.com/o1-labs/o1js/) that allows a zkApp developer to pack extra data into a single Field.

### Usage in a zkApp

### Smart Contract

The primary benefit of using this library in a smart contract is that it allows you to use more of your allotted 8 Fields of storage.

Check out example usage in a smart contract in [Smart Contract Examples](/examples/smart_contract/).

### ZK Program

The benefit to using this library in a zk program is less obvious. In some cases, the number of gates required in a circuit is less using this library than with provable arrays. Especially in applications where the array is hashed many times, packing and unpacking ends up being more effecient than doing a lot of Poseidon hashes. In other cases, you may just prefer the API of o1js Pack compared to using provable arrays.

Check out example usage in a zk program in [Zk Program Examples](/examples/zk_program/).

## How to build

```sh
npm run build
```

## How to run tests

```sh
npm run test src # non-proof tests
npm run test tests/provable # provable tests
```

## Credits

Thanks to @mario_zito for seeding the idea for this library on Discord ([Thread 1](https://discord.com/channels/484437221055922177/1128509274465779822), [Thread 2](https://discord.com/channels/484437221055922177/1128501705173106698)), and to @gregor for sounding out the early implementation.

Thanks to @iam-dev for early adoption!

## License

[Apache-2.0](LICENSE)


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o1js-pack

o1js Pack

What is it

Usage in a zkApp

Smart Contract

ZK Program

How to build

How to run tests

Credits

License

Keywords

Related posts

o1js-pack

o1js Pack

What is it

Usage in a zkApp

Smart Contract

ZK Program

How to build

How to run tests

Credits

License

Keywords

Related posts

Node.js Drops Bug Bounty Rewards After Funding Dries Up

The Hidden Blast Radius of the Axios Compromise