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circe

12 indexed repositories · View on GitHub

circe
Yet another JSON library for Scala

Scala · 2540 stars
circe-yaml
YAML parser for circe using SnakeYAML

Scala · 147 stars
circe-derivation
Fast type class instance derivation for Circe

Scala · 132 stars
circe-config
Yet another Typesafe config Scala wrapper powered by circe

Scala · 130 stars
circe-golden
Golden testing for Circe

Scala · 97 stars
circe-generic-extras
Configurable generic derivation for Circe

Scala · 77 stars
circe-json-schema
JSON Schema validation for Circe

Scala · 51 stars
circe-optics
Monocle lenses and other tools for working with JSON values

Scala · 51 stars
circe-droste
Recursion schemes for Circe

Scala · 21 stars
circe-jackson
Jackson parsing and printing for circe

Scala · 19 stars
circe-iteratee
Streaming JSON processing for circe with iteratees

Scala · 11 stars
circe-spire
circe encoders and decoders for Spire types

Scala · 9 stars

Beginner friendly Everything

Open All

Printer indents content after `}` and `]` at child depth instead of parent depth Open

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

circe/circe#2459 · Opened May 10, 2026
Printer with empty indent swaps rbraceLeft and rbraceRight (ConstantPieces path) Open

Difficulty 1/5 Under an hour Newbie friendliness 82/100

circe/circe#2458 · Opened May 10, 2026
BiggerDecimal.integralIsValidLong returns true for "-", "+", "a" and crashes on "" Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

circe/circe#2457 · Opened May 10, 2026
`Json.mapNumber` asymmetric API and forced unsafe `.get` Open

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

circe/circe#2436 · Opened Mar 1, 2026
circe testing breaks scala 3.8.1 compilation when compiler option "-Wsafe-init" is enabled. Open

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

circe/circe#2422 · Opened Jan 23, 2026
ADT derivation can produce not the same code between compilation Open

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

circe/circe-derivation#555 · Opened Dec 24, 2025
Automatic derivation of Codec for Scala 3 union types Open

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

circe/circe#2393 · 2 reactions · Opened Jul 24, 2025
Road to version 1.0 Open

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

circe/circe#2386 · Opened Jun 26, 2025
`NullPointerException` when generating external objects Open

Difficulty 2/5 1-3 hours Newbie friendliness 55/100

circe/circe-golden#296 · 1 comment · Opened May 27, 2025
scala3 meet error some dependency not found ， derivation.Configuration not exist Open

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

circe/circe-generic-extras#411 · 3 comments · Opened May 16, 2025
StackOverflowError if local class with Scala 3 Open

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

circe/circe-generic-extras#404 · Opened Apr 22, 2025
Stopped publishing for Scala 2.12 in v0.16.0 Open

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

circe/circe-yaml#479 · Opened Apr 15, 2025
No given instance of type io.circe.derivation.Default[this.Message] was found Open

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

circe/circe#2365 · 1 comment · Opened Mar 20, 2025
How to remove null values in dictionaries and collections Open

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

circe/circe#2351 · 1 comment · Opened Feb 6, 2025
Support deriving Encoder / Decoder for `NamedTuples` ? Open

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

circe/circe#2326 · 6 comments · Opened Nov 8, 2024
scala3 default values should not be lazy val Open

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

circe/circe#2322 · 1 comment · 2 reactions · Opened Oct 30, 2024
Add Automatic-Module-Name Open

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

circe/circe#2318 · 3 comments · Opened Oct 11, 2024
Numbers bigger than `1L << 53` loose lower bits when parsing by default parser using Scala.js Open

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

circe/circe#2311 · 3 comments · Opened Sep 17, 2024
Consider adding support for json raw string value Open

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

circe/circe#2310 · 3 comments · Opened Sep 16, 2024
The documentation doesn´t specifiy it is available for Scala 3 Open

Difficulty 1/5 Under an hour Newbie friendliness 48/100

circe/circe#2300 · 1 reaction · Opened Aug 19, 2024
Misleading decoder errors when decoding non-objects on Scala 2 derived codecs Open

Difficulty 3/5 1-2 days Newbie friendliness 52/100

circe/circe#2297 · 2 reactions · Opened Aug 16, 2024
Golden File Detection Open

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

circe/circe-golden#272 · Opened Aug 15, 2024
String values written quoted when using scala-yaml backend Open

Difficulty 3/5 1-2 days Newbie friendliness 52/100

circe/circe-yaml#441 · Opened Jul 29, 2024
candidate for archive? Open

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

circe/circe-iteratee#289 · Opened Jul 2, 2024
Scala 3 Inconsistent Application of Configuration Discriminator Open

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

circe/circe#2281 · 3 comments · 1 reaction · Opened Jun 8, 2024
use sbt-circe-org Open

good first issue help wanted

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

circe/circe-json-schema#245 · Opened Apr 22, 2024
Expected `json` string interpolator from io.circe.literal to be able to interpolate variable inside of value strings Open

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

circe/circe#2246 · 3 comments · Opened Apr 4, 2024
Scala 2.13: derivedConfiguratedEncoder becomes unconfigured under some conditions Open

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

circe/circe#2241 · 1 comment · Opened Mar 22, 2024
Can't call io.circe.yaml.parser.parse on an input stream reader in 0.15.1 Open

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

circe/circe-yaml#410 · 3 comments · 5 reactions · Opened Dec 5, 2023
v1.15.0 is on Maven Central Open

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

circe/circe-yaml#402 · 7 comments · Opened Nov 1, 2023
Stack overflow on 0.14.6 Open

bug

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

circe/circe#2209 · 5 comments · 1 reaction · Opened Oct 25, 2023
Codec derivation - `dropNullValues` Open

help wanted

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

circe/circe-generic-extras#323 · 4 comments · 3 reactions · Opened Oct 3, 2023
Newer json-schema versions support Open

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

circe/circe-json-schema#223 · 2 comments · Opened Aug 29, 2023
Can we have a 0.14.x release? Open

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

circe/circe-iteratee#261 · Opened Jul 30, 2023
Support new configuration that handles digit as a delimiter when converting to snake_case Open

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

circe/circe#2137 · 1 comment · Opened May 12, 2023
Derivation doens't apply Configuration Open

documentation help wanted

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

circe/circe#2136 · 5 comments · Opened May 11, 2023
Scala 3 support Open

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

circe/circe-json-schema#204 · 3 reactions · Opened Mar 1, 2023
[Bug] Recursive ADTs fail to Derive Open

bug Scala 3

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

circe/circe#2101 · 2 comments · Opened Feb 20, 2023
`Eq[JsonObject]` property flake Open

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

circe/circe#2074 · Opened Jan 12, 2023
deriveConfiguredCodec extremely slow compared to deriveCodec Open

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

circe/circe#2068 · Opened Dec 8, 2022
Custom key mappings get NPE error Open

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

circe/circe#2067 · Opened Dec 8, 2022
Slow codec automatic derivation Open

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

circe/circe#2051 · 5 reactions · Opened Nov 2, 2022
Enum singleton cases should be optionally serialized to string. Open

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

circe/circe#2033 · 1 comment · 1 reaction · Opened Oct 9, 2022
Schism scodec and refined modules Open

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

circe/circe#2028 · 1 comment · Opened Sep 24, 2022
Option Parameters always returning None Open

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

circe/circe-yaml#316 · 1 comment · Opened Aug 29, 2022
Scala 3 support? Open

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

circe/circe-derivation#416 · 2 comments · Opened Aug 17, 2022
no implicit values were found that match type io.circe.export.Exported[io.circe.Decoder[T]] Open

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

circe/circe#2008 · 1 comment · Opened Jul 29, 2022
yaml literals Open

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

circe/circe-yaml#310 · Opened Jul 22, 2022
Automatic derivation for recursive types is broken in Scala 3 Open

Difficulty 5/5 Over a week Newbie friendliness 28/100

circe/circe#1980 · 8 comments · Opened Jun 28, 2022
Compile error when immediately `asJson` after constructing a case class. Open

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

circe/circe#1977 · Opened Jun 22, 2022

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