paritytech/parity-scale-codec

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Lightweight, efficient, binary serialization and deserialization codec

Stars: 287
Forks: 103
Open beginner issues: 0
Indexed issues: 55
Avg merge: 6d 13h
Merged PRs (30d): 1

Dominant language: Rust
License: Apache-2.0
Last GitHub push: Sep 13, 2026
Latest indexed: Sep 19, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: help wanted

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55 open issues indexed

Suggestion for new decode API forcing developers to explicitly write down all decode options/limits Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

paritytech/parity-scale-codec#785 · Opened Nov 19, 2025
Implement `core::error::Error` on supported compiler version Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

paritytech/parity-scale-codec#745 · Opened Jun 18, 2025
Unsound `read_vec_from_u8s()` Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

paritytech/parity-scale-codec#730 · Opened May 7, 2025
Inline trivial implementations Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

paritytech/parity-scale-codec#728 · Opened May 4, 2025
Bug: incorrect index assignment with `#[codec(index = ...)]` Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

paritytech/parity-scale-codec#724 · 2 comments · Opened Apr 11, 2025
Documentation for the Compact Integer Encoding Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

paritytech/parity-scale-codec#723 · 4 comments · 2 reactions · Opened Mar 26, 2025
Clippy warning emitted in `DecodeWithMemTracking`. Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

paritytech/parity-scale-codec#705 · Opened Mar 2, 2025
Revert #663 as part of 4.0 Open

Difficulty 5/5 Over a week Newbie friendliness 15/100

paritytech/parity-scale-codec#684 · Opened Jan 23, 2025
implement `core::error::Error` instead of `std::error::Error` Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

paritytech/parity-scale-codec#676 · Opened Jan 10, 2025
A way to require enum variant index being specified Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

paritytech/parity-scale-codec#666 · 2 comments · Opened Dec 14, 2024
Implement support for `Box<[T]>` and `Arc<[T]>` Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

paritytech/parity-scale-codec#633 · 3 comments · 1 reaction · Opened Oct 13, 2024
Custom types with `HasCompact` Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

paritytech/parity-scale-codec#613 · 7 comments · Opened Jul 11, 2024
Derivation adds unnecessary bounds that can't be satisfied for certain recursive types Open

Difficulty 3/5 1-2 days Newbie friendliness 30/100

paritytech/parity-scale-codec#603 · 4 comments · Opened May 31, 2024
Compilation Error with `parity-scale-codec v3.6.9` After Updating Substrate Chain to `polkadot-v1.9.0` Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

paritytech/parity-scale-codec#575 · 1 comment · Opened Mar 26, 2024
Implement `Decode` for `Box<T> where T: ?Sized` Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

paritytech/parity-scale-codec#564 · 2 comments · 1 reaction · Opened Jan 11, 2024
More `codec` edge cases Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

paritytech/parity-scale-codec#555 · 1 comment · 1 reaction · Opened Jan 2, 2024
Setup Github pages for SCALE docs minipage Open

Difficulty 1/5 Under an hour Newbie friendliness 35/100

paritytech/parity-scale-codec#536 · 1 comment · Opened Oct 27, 2023
Support enum with `Compact` prefix Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

paritytech/parity-scale-codec#521 · 3 comments · 1 reaction · Opened Sep 13, 2023
Backwards incompatible change in patch version Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

paritytech/parity-scale-codec#520 · 18 comments · Opened Sep 11, 2023
Seal `HasCompact` + `CompactLen` Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

paritytech/parity-scale-codec#514 · 4 comments · Opened Sep 7, 2023
Implement `Input` for tuples Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

paritytech/parity-scale-codec#511 · Opened Sep 5, 2023
Disallow duplicated enum variant indices Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

paritytech/parity-scale-codec#507 · 1 comment · 3 reactions · Opened Aug 29, 2023
Implement `Codec` for `BitArray` Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

paritytech/parity-scale-codec#480 · Opened Jul 12, 2023
run `cargo fmt` during CI Open

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

paritytech/parity-scale-codec#475 · 1 comment · Opened Jul 7, 2023
Implement `MaxEncodedLen` for all types that don't implement it and return 0 Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

paritytech/parity-scale-codec#465 · 9 comments · 1 reaction · Opened Jul 3, 2023
Make all of the integration tests clippy-clean Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

paritytech/parity-scale-codec#459 · 1 reaction · Opened Jun 19, 2023
Use `Box::new_ununit` etc. once that's stabilized Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

paritytech/parity-scale-codec#458 · Opened Jun 19, 2023
Update `parity-scale-codec-derive` to `syn` 2.x Open

Difficulty 3/5 1-2 days Newbie friendliness 30/100

paritytech/parity-scale-codec#457 · Opened Jun 19, 2023
Support heapless mode Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

paritytech/parity-scale-codec#424 · 1 reaction · Opened Apr 10, 2023
Why not just publish a crate called `scale-codec` instead? Open

Difficulty 5/5 Over a week Newbie friendliness 15/100

paritytech/parity-scale-codec#407 · 4 comments · Opened Feb 1, 2023
A question on semver stability Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

paritytech/parity-scale-codec#405 · 2 comments · Opened Jan 31, 2023
MaxEncodedLen derive not adding bounds when used with compact Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

paritytech/parity-scale-codec#348 · 2 comments · Opened Jun 10, 2022
Improve performance Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

paritytech/parity-scale-codec#341 · 4 reactions · Opened May 24, 2022
Create `Codec` derive macro Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

paritytech/parity-scale-codec#324 · 1 comment · Opened Feb 16, 2022
Is there any detailed tutorial for this library? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

paritytech/parity-scale-codec#322 · 7 reactions · Opened Feb 16, 2022
Allow for more than 256 variant enum: encode variant with compact encoding for integer. Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

paritytech/parity-scale-codec#305 · Opened Dec 1, 2021
Support `Compact<Option<T>>` Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

paritytech/parity-scale-codec#295 · 2 comments · Opened Oct 13, 2021
Std in derive Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

paritytech/parity-scale-codec#284 · 4 comments · 1 reaction · Opened Aug 6, 2021
Do not derive encode/decode when discriminant doesn't fit u8. Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

paritytech/parity-scale-codec#283 · 7 comments · Opened Jul 27, 2021
Allow somehow validate the decoded output Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

paritytech/parity-scale-codec#280 · 3 comments · Opened Jul 1, 2021
Invalid bound for for field type like `<T>::A` Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

paritytech/parity-scale-codec#258 · Opened Mar 10, 2021
Invalid recursive bound removal Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

paritytech/parity-scale-codec#257 · 1 reaction · Opened Mar 9, 2021
Allow C-like enum with a repr other than u8 to be Encode/Decode Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

paritytech/parity-scale-codec#255 · 1 comment · Opened Feb 25, 2021
BTreeMap and potentially other FromIter codec does not have strict one-to-one correspondance Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

paritytech/parity-scale-codec#251 · 2 comments · Opened Feb 16, 2021
Optimize implementation of `Decode::skip()` and `Decode::encoded_fixed_size()` for most primitives types Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 30/100

paritytech/parity-scale-codec#244 · Opened Jan 22, 2021
Maybe bounds for recursive types can be improved Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

paritytech/parity-scale-codec#217 · 3 comments · Opened Jul 22, 2020
`<[T, $n]>::decode` implementation can make use of TypeInfo Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

paritytech/parity-scale-codec#207 · Opened Apr 9, 2020
Compact encoding for signed integer Open

enhancement help wanted

Difficulty 4/5 3-5 days Newbie friendliness 45/100

paritytech/parity-scale-codec#205 · 3 comments · 2 reactions · Opened Apr 8, 2020
Encoding must be unique. But BinaryHeap encoding order seems arbitrary Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

paritytech/parity-scale-codec#190 · 3 comments · Opened Mar 19, 2020
Derive encode for variants can result in having multiple variants having same index. Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

paritytech/parity-scale-codec#173 · 7 comments · Opened Dec 3, 2019

paritytech/parity-scale-codec

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