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fix: Add throw error on jsonCodec decoder on JSON string with extra char #724

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fix: Add throw error on jsonCodec decoder on JSON string with extra char #724

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213 changes: 120 additions & 93 deletions zio-schema-json/shared/src/main/scala/zio/schema/codec/JsonCodec.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -489,11 +489,25 @@ object JsonCodec {
import Codecs._
import ProductDecoder._

final def decode[A](schema: Schema[A], json: String): Either[DecodeError, A] =
schemaDecoder(schema).decodeJson(json) match {
final def decode[A](schema: Schema[A], json: String): Either[DecodeError, A] = {
val trimmedJson = json.trim
schemaDecoder(schema).decodeJson(trimmedJson) match {
case Left(value) => Left(ReadError(Cause.empty, value))
case Right(value) => Right(value)
case Right(value) =>
// Check for any remaining non-whitespace characters
val lastValidChar = trimmedJson.last match {
case '}' => trimmedJson.lastIndexOf('}')
case ']' => trimmedJson.lastIndexOf(']')
case '"' => trimmedJson.lastIndexOf('"')
case _ => trimmedJson.length - 1
}
if (trimmedJson.length > lastValidChar + 1) {
Left(ReadError(Cause.empty, "Unexpected characters after end of JSON"))
} else {
Right(value)
}
}
}

def x[A](dec: ZJsonDecoder[A]): Unit = dec match {
case _: ZJsonDecoder[_] =>
Expand Down Expand Up @@ -543,96 +557,109 @@ object JsonCodec {
}

//scalafmt: { maxColumn = 400, optIn.configStyleArguments = false }
private[codec] def schemaDecoder[A](schema: Schema[A], discriminator: Int = -1): ZJsonDecoder[A] = schema match {
case Schema.Primitive(standardType, _) => primitiveCodec(standardType).decoder
case Schema.Optional(codec, _) => option(schemaDecoder(codec, discriminator))
case Schema.Tuple2(left, right, _) => ZJsonDecoder.tuple2(schemaDecoder(left, -1), schemaDecoder(right, -1))
case Schema.Transform(c, f, _, a, _) => schemaDecoder(a.foldLeft(c)((s, a) => s.annotate(a)), discriminator).mapOrFail(f)
case Schema.Sequence(codec, f, _, _, _) => ZJsonDecoder.chunk(schemaDecoder(codec, -1)).map(f)
case Schema.Map(ks, vs, _) => mapDecoder(ks, vs)
case Schema.Set(s, _) => ZJsonDecoder.chunk(schemaDecoder(s, -1)).map(entries => entries.toSet)
case Schema.Fail(message, _) => failDecoder(message)
case Schema.GenericRecord(_, structure, _) => recordDecoder(structure.toChunk, schema.annotations.contains(rejectExtraFields()))
case Schema.Either(left, right, _) => ZJsonDecoder.either(schemaDecoder(left, -1), schemaDecoder(right, -1))
case s @ Schema.Fallback(_, _, _, _) => fallbackDecoder(s)
case l @ Schema.Lazy(_) => schemaDecoder(l.schema, discriminator)
//case Schema.Meta(_, _) => astDecoder
case s @ Schema.CaseClass0(_, _, _) => caseClass0Decoder(discriminator, s)
case s @ Schema.CaseClass1(_, _, _, _) => caseClass1Decoder(discriminator, s)
case s @ Schema.CaseClass2(_, _, _, _, _) => caseClass2Decoder(discriminator, s)
case s @ Schema.CaseClass3(_, _, _, _, _, _) => caseClass3Decoder(discriminator, s)
case s @ Schema.CaseClass4(_, _, _, _, _, _, _) => caseClass4Decoder(discriminator, s)
case s @ Schema.CaseClass5(_, _, _, _, _, _, _, _) => caseClass5Decoder(discriminator, s)
case s @ Schema.CaseClass6(_, _, _, _, _, _, _, _, _) => caseClass6Decoder(discriminator, s)
case s @ Schema.CaseClass7(_, _, _, _, _, _, _, _, _, _) => caseClass7Decoder(discriminator, s)
case s @ Schema.CaseClass8(_, _, _, _, _, _, _, _, _, _, _) => caseClass8Decoder(discriminator, s)
case s @ Schema.CaseClass9(_, _, _, _, _, _, _, _, _, _, _, _) => caseClass9Decoder(discriminator, s)
case s @ Schema.CaseClass10(_, _, _, _, _, _, _, _, _, _, _, _, _) => caseClass10Decoder(discriminator, s)
case s @ Schema.CaseClass11(_, _, _, _, _, _, _, _, _, _, _, _, _, _) =>
caseClass11Decoder(discriminator, s)
case s @ Schema.CaseClass12(_, _, _, _, _, _, _, _, _, _, _, _, _, _, _) =>
caseClass12Decoder(discriminator, s)
case s @ Schema.CaseClass13(_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _) =>
caseClass13Decoder(discriminator, s)
case s @ Schema
.CaseClass14(_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _) =>
caseClass14Decoder(discriminator, s)
case s @ Schema
.CaseClass15(_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _) =>
caseClass15Decoder(discriminator, s)
case s @ Schema.CaseClass16(_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _) =>
caseClass16Decoder(discriminator, s)
case s @ Schema.CaseClass17(_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _) =>
caseClass17Decoder(discriminator, s)
case s @ Schema.CaseClass18(_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _) =>
caseClass18Decoder(discriminator, s)
case s @ Schema.CaseClass19(_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _) =>
caseClass19Decoder(discriminator, s)
case s @ Schema.CaseClass20(_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _) =>
caseClass20Decoder(discriminator, s)
case s @ Schema.CaseClass21(_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _) =>
caseClass21Decoder(discriminator, s)
case s @ Schema.CaseClass22(_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _) =>
caseClass22Decoder(discriminator, s)
case e @ Schema.Enum1(_, c, _) => enumDecoder(e, c)
case e @ Schema.Enum2(_, c1, c2, _) => enumDecoder(e, c1, c2)
case e @ Schema.Enum3(_, c1, c2, c3, _) => enumDecoder(e, c1, c2, c3)
case e @ Schema.Enum4(_, c1, c2, c3, c4, _) => enumDecoder(e, c1, c2, c3, c4)
case e @ Schema.Enum5(_, c1, c2, c3, c4, c5, _) => enumDecoder(e, c1, c2, c3, c4, c5)
case e @ Schema.Enum6(_, c1, c2, c3, c4, c5, c6, _) => enumDecoder(e, c1, c2, c3, c4, c5, c6)
case e @ Schema.Enum7(_, c1, c2, c3, c4, c5, c6, c7, _) => enumDecoder(e, c1, c2, c3, c4, c5, c6, c7)
case e @ Schema.Enum8(_, c1, c2, c3, c4, c5, c6, c7, c8, _) => enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8)
case e @ Schema.Enum9(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, _) => enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9)
case e @ Schema.Enum10(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, _) =>
enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10)
case e @ Schema.Enum11(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, _) =>
enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11)
case e @ Schema.Enum12(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, _) =>
enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12)
case e @ Schema.Enum13(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, _) =>
enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13)
case e @ Schema.Enum14(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, _) =>
enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14)
case e @ Schema.Enum15(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, _) =>
enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15)
case e @ Schema.Enum16(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, _) =>
enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16)
case e @ Schema.Enum17(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, _) =>
enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17)
case e @ Schema.Enum18(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, _) =>
enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18)
case e @ Schema.Enum19(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19, _) =>
enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19)
case e @ Schema
.Enum20(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19, c20, _) =>
enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19, c20)
case e @ Schema.Enum21(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19, c20, c21, _) =>
enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19, c20, c21)
case e @ Schema.Enum22(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19, c20, c21, c22, _) =>
enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19, c20, c21, c22)
case e @ Schema.EnumN(_, cs, _) => enumDecoder(e, cs.toSeq: _*)
case d @ Schema.Dynamic(_) => dynamicDecoder(d)
case _ => throw new Exception(s"Missing a handler for decoding of schema ${schema.toString()}.")
private[codec] def schemaDecoder[A](schema: Schema[A], discriminator: Int = -1): ZJsonDecoder[A] = {
new ZJsonDecoder[A] {
def unsafeDecode(trace: List[JsonError], in: RetractReader): A = {
val result = schema match {
case Schema.Primitive(standardType, _) => primitiveCodec(standardType).decoder
case Schema.Optional(codec, _) => option(schemaDecoder(codec, discriminator))
case Schema.Tuple2(left, right, _) => ZJsonDecoder.tuple2(schemaDecoder(left, -1), schemaDecoder(right, -1))
case Schema.Transform(c, f, _, a, _) => schemaDecoder(a.foldLeft(c)((s, a) => s.annotate(a)), discriminator).mapOrFail(f)
case Schema.Sequence(codec, f, _, _, _) => ZJsonDecoder.chunk(schemaDecoder(codec, -1)).map(f)
case Schema.Map(ks, vs, _) => mapDecoder(ks, vs)
case Schema.Set(s, _) => ZJsonDecoder.chunk(schemaDecoder(s, -1)).map(entries => entries.toSet)
case Schema.Fail(message, _) => failDecoder(message)
case Schema.GenericRecord(_, structure, _) => recordDecoder(structure.toChunk, schema.annotations.contains(rejectExtraFields()))
case Schema.Either(left, right, _) => ZJsonDecoder.either(schemaDecoder(left, -1), schemaDecoder(right, -1))
case s @ Schema.Fallback(_, _, _, _) => fallbackDecoder(s)
case l @ Schema.Lazy(_) => schemaDecoder(l.schema, discriminator)
//case Schema.Meta(_, _) => astDecoder
case s @ Schema.CaseClass0(_, _, _) => caseClass0Decoder(discriminator, s)
case s @ Schema.CaseClass1(_, _, _, _) => caseClass1Decoder(discriminator, s)
case s @ Schema.CaseClass2(_, _, _, _, _) => caseClass2Decoder(discriminator, s)
case s @ Schema.CaseClass3(_, _, _, _, _, _) => caseClass3Decoder(discriminator, s)
case s @ Schema.CaseClass4(_, _, _, _, _, _, _) => caseClass4Decoder(discriminator, s)
case s @ Schema.CaseClass5(_, _, _, _, _, _, _, _) => caseClass5Decoder(discriminator, s)
case s @ Schema.CaseClass6(_, _, _, _, _, _, _, _, _) => caseClass6Decoder(discriminator, s)
case s @ Schema.CaseClass7(_, _, _, _, _, _, _, _, _, _) => caseClass7Decoder(discriminator, s)
case s @ Schema.CaseClass8(_, _, _, _, _, _, _, _, _, _, _) => caseClass8Decoder(discriminator, s)
case s @ Schema.CaseClass9(_, _, _, _, _, _, _, _, _, _, _, _) => caseClass9Decoder(discriminator, s)
case s @ Schema.CaseClass10(_, _, _, _, _, _, _, _, _, _, _, _, _) => caseClass10Decoder(discriminator, s)
case s @ Schema.CaseClass11(_, _, _, _, _, _, _, _, _, _, _, _, _, _) =>
caseClass11Decoder(discriminator, s)
case s @ Schema.CaseClass12(_, _, _, _, _, _, _, _, _, _, _, _, _, _, _) =>
caseClass12Decoder(discriminator, s)
case s @ Schema.CaseClass13(_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _) =>
caseClass13Decoder(discriminator, s)
case s @ Schema
.CaseClass14(_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _) =>
caseClass14Decoder(discriminator, s)
case s @ Schema
.CaseClass15(_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _) =>
caseClass15Decoder(discriminator, s)
case s @ Schema.CaseClass16(_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _) =>
caseClass16Decoder(discriminator, s)
case s @ Schema.CaseClass17(_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _) =>
caseClass17Decoder(discriminator, s)
case s @ Schema.CaseClass18(_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _) =>
caseClass18Decoder(discriminator, s)
case s @ Schema.CaseClass19(_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _) =>
caseClass19Decoder(discriminator, s)
case s @ Schema.CaseClass20(_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _) =>
caseClass20Decoder(discriminator, s)
case s @ Schema.CaseClass21(_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _) =>
caseClass21Decoder(discriminator, s)
case s @ Schema.CaseClass22(_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _) =>
caseClass22Decoder(discriminator, s)
case e @ Schema.Enum1(_, c, _) => enumDecoder(e, c)
case e @ Schema.Enum2(_, c1, c2, _) => enumDecoder(e, c1, c2)
case e @ Schema.Enum3(_, c1, c2, c3, _) => enumDecoder(e, c1, c2, c3)
case e @ Schema.Enum4(_, c1, c2, c3, c4, _) => enumDecoder(e, c1, c2, c3, c4)
case e @ Schema.Enum5(_, c1, c2, c3, c4, c5, _) => enumDecoder(e, c1, c2, c3, c4, c5)
case e @ Schema.Enum6(_, c1, c2, c3, c4, c5, c6, _) => enumDecoder(e, c1, c2, c3, c4, c5, c6)
case e @ Schema.Enum7(_, c1, c2, c3, c4, c5, c6, c7, _) => enumDecoder(e, c1, c2, c3, c4, c5, c6, c7)
case e @ Schema.Enum8(_, c1, c2, c3, c4, c5, c6, c7, c8, _) => enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8)
case e @ Schema.Enum9(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, _) => enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9)
case e @ Schema.Enum10(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, _) =>
enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10)
case e @ Schema.Enum11(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, _) =>
enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11)
case e @ Schema.Enum12(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, _) =>
enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12)
case e @ Schema.Enum13(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, _) =>
enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13)
case e @ Schema.Enum14(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, _) =>
enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14)
case e @ Schema.Enum15(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, _) =>
enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15)
case e @ Schema.Enum16(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, _) =>
enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16)
case e @ Schema.Enum17(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, _) =>
enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17)
case e @ Schema.Enum18(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, _) =>
enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18)
case e @ Schema.Enum19(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19, _) =>
enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19)
case e @ Schema
.Enum20(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19, c20, _) =>
enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19, c20)
case e @ Schema.Enum21(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19, c20, c21, _) =>
enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19, c20, c21)
case e @ Schema.Enum22(_, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19, c20, c21, c22, _) =>
enumDecoder(e, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19, c20, c21, c22)
case e @ Schema.EnumN(_, cs, _) => enumDecoder(e, cs.toSeq: _*)
case d @ Schema.Dynamic(_) => dynamicDecoder(d)
case _ => throw new Exception(s"Missing a handler for decoding of schema ${schema.toString()}.")
}

// Check for unexpected characters after parsing
if (in.nextNonWhitespace() != -1) {
throw UnsafeJson(JsonError.Message("Unexpected characters after parsed content") :: trace)
}

result.asInstanceOf[A]
}
}
}
//scalafmt: { maxColumn = 120, optIn.configStyleArguments = true }

Expand Down
40 changes: 40 additions & 0 deletions zio-schema-json/shared/src/test/scala-2/zio/schema/codec/JsonCodecSpec.scala
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,16 @@ import zio.test._

object JsonCodecSpec extends ZIOSpecDefault {

object Foo {
implicit val schema: Schema[Foo.type] = DeriveSchema.gen[Foo.type]
}

final case class Bar(a: Int)

object Bar {
implicit val schema: Schema[Bar] = DeriveSchema.gen[Bar]
}

def spec: Spec[TestEnvironment, Any] =
suite("JsonCodec Spec")(
encoderSuite,
Expand Down Expand Up @@ -884,6 +894,36 @@ object JsonCodecSpec extends ZIOSpecDefault {
charSequenceToByteChunk("""null""")
)
}
),
suite("zio.schema.codec.JsonCodec.jsonDecoder reject extra characters")(
test("extra } in empty object") {
assertTrue(
zio.schema.codec.JsonCodec
.jsonDecoder(Schema[Foo.type])
.decodeJson(
"""{}}"""
)
.isLeft
)
},
test("extra } in non-empty object") {
assertTrue(
zio.schema.codec.JsonCodec
.jsonDecoder(Schema[Bar])
.decodeJson(
"""{"a":1}}"""
)
.isLeft
)
},
test("extra \" in string") {
assertTrue(
zio.schema.codec.JsonCodec
.jsonDecoder(Schema[String])
.decodeJson("\"foo\"\"")
.isLeft
)
}
)
)

Expand Down
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