diff --git a/exposed-json/src/main/kotlin/org/jetbrains/exposed/v1/json/JsonColumnType.kt b/exposed-json/src/main/kotlin/org/jetbrains/exposed/v1/json/JsonColumnType.kt
index 66fbaf28da..9321abe613 100644
--- a/exposed-json/src/main/kotlin/org/jetbrains/exposed/v1/json/JsonColumnType.kt
+++ b/exposed-json/src/main/kotlin/org/jetbrains/exposed/v1/json/JsonColumnType.kt
@@ -12,6 +12,7 @@ import org.jetbrains.exposed.v1.core.statements.api.RowApi
 import org.jetbrains.exposed.v1.core.vendors.H2Dialect
 import org.jetbrains.exposed.v1.core.vendors.PostgreSQLDialect
 import org.jetbrains.exposed.v1.core.vendors.currentDialect
+import java.sql.Clob
 
 /**
  * Column for storing JSON data, either in non-binary text format or the vendor's default JSON type format.
@@ -73,14 +74,18 @@ open class JsonColumnType<T : Any>(
     }
 
     override fun readObject(rs: RowApi, index: Int): Any? {
-        return if (currentDialect is PostgreSQLDialect) {
-            rs.getString(index)
-        } else {
-            super.readObject(rs, index)
+        if (currentDialect is PostgreSQLDialect) return rs.getString(index)
+
+        return when (val value = super.readObject(rs, index)) {
+            is Clob -> value.readText()
+            else -> value
         }
     }
 }
 
+/** Reads this large object completely, releasing the reader it was streamed through. */
+private fun Clob.readText(): String = characterStream.use { it.readText() }
+
 /**
  * Creates a column, with the specified [name], for storing JSON data.
  *
diff --git a/exposed-json/src/test/kotlin/org/jetbrains/exposed/v1/json/JsonColumnTests.kt b/exposed-json/src/test/kotlin/org/jetbrains/exposed/v1/json/JsonColumnTests.kt
index 412da01941..ed5c8fc5b4 100644
--- a/exposed-json/src/test/kotlin/org/jetbrains/exposed/v1/json/JsonColumnTests.kt
+++ b/exposed-json/src/test/kotlin/org/jetbrains/exposed/v1/json/JsonColumnTests.kt
@@ -13,6 +13,7 @@ import org.jetbrains.exposed.v1.core.vendors.PostgreSQLDialect
 import org.jetbrains.exposed.v1.core.vendors.SQLServerDialect
 import org.jetbrains.exposed.v1.exceptions.UnsupportedByDialectException
 import org.jetbrains.exposed.v1.jdbc.*
+import org.jetbrains.exposed.v1.jdbc.transactions.inTopLevelTransaction
 import org.jetbrains.exposed.v1.tests.DatabaseTestsBase
 import org.jetbrains.exposed.v1.tests.MISSING_R2DBC_TEST
 import org.jetbrains.exposed.v1.tests.TestDB
@@ -492,4 +493,49 @@ class JsonColumnTests : DatabaseTestsBase() {
             assertEquals(newUser, result[infoAsJson])
         }
     }
+
+    private val textIsNotClob = TestDB.ALL - TestDB.ALL_ORACLE_LIKE
+
+    @Test
+    fun testJsonStoredAsClob() {
+        val textTester = object : IntIdTable("json_large_text_tester") {
+            val payload = text("payload")
+        }
+        val jsonTester = object : IntIdTable("json_large_text_tester") {
+            val payload = json<User>("payload", Json.Default)
+        }
+
+        val newUser = User("Pro", "Alpha")
+        var writtenAsText: EntityID<Int>? = null
+        var writtenAsJson: EntityID<Int>? = null
+
+        withTables(excludeSettings = textIsNotClob, textTester) {
+            val columnDdl = textTester.payload.descriptionDdl()
+            kotlin.test.assertTrue(
+                columnDdl.contains("CLOB"),
+                "The column must be created as a CLOB for this test to exercise anything, but was: $columnDdl"
+            )
+
+            inTopLevelTransaction {
+                maxAttempts = 1
+                val textId = textTester.insertAndGetId { it[payload] = Json.encodeToString(newUser) }
+                val jsonId = jsonTester.insertAndGetId { it[payload] = newUser }
+                writtenAsText = textId
+                writtenAsJson = jsonId
+
+                for (id in listOf(textId, jsonId)) {
+                    val row = jsonTester.selectAll().where { jsonTester.id eq id }.single()
+                    assertEquals(newUser, row[jsonTester.payload])
+                }
+            }
+
+            inTopLevelTransaction {
+                maxAttempts = 1
+                for (id in listOf(assertNotNull(writtenAsText), assertNotNull(writtenAsJson))) {
+                    val row = jsonTester.selectAll().where { jsonTester.id eq id }.single()
+                    assertEquals(newUser, row[jsonTester.payload])
+                }
+            }
+        }
+    }
 }
diff --git a/exposed-r2dbc-tests/src/test/kotlin/org/jetbrains/exposed/v1/r2dbc/sql/tests/json/JsonColumnTests.kt b/exposed-r2dbc-tests/src/test/kotlin/org/jetbrains/exposed/v1/r2dbc/sql/tests/json/JsonColumnTests.kt
index 80b23b31d7..9cb45a86bc 100644
--- a/exposed-r2dbc-tests/src/test/kotlin/org/jetbrains/exposed/v1/r2dbc/sql/tests/json/JsonColumnTests.kt
+++ b/exposed-r2dbc-tests/src/test/kotlin/org/jetbrains/exposed/v1/r2dbc/sql/tests/json/JsonColumnTests.kt
@@ -30,6 +30,7 @@ import org.jetbrains.exposed.v1.r2dbc.tests.shared.assertEqualLists
 import org.jetbrains.exposed.v1.r2dbc.tests.shared.assertEquals
 import org.jetbrains.exposed.v1.r2dbc.tests.shared.assertTrue
 import org.jetbrains.exposed.v1.r2dbc.tests.shared.expectException
+import org.jetbrains.exposed.v1.r2dbc.transactions.inTopLevelSuspendTransaction
 import org.junit.jupiter.api.Test
 import kotlin.test.assertContentEquals
 import kotlin.test.assertNotNull
@@ -464,4 +465,47 @@ class JsonColumnTests : R2dbcDatabaseTestsBase() {
             assertEquals(newUser, result[infoAsJson])
         }
     }
+
+    @Test
+    fun testJsonStoredAsClob() {
+        val textTester = object : IntIdTable("json_large_text_tester") {
+            val payload = text("payload")
+        }
+        val jsonTester = object : IntIdTable("json_large_text_tester") {
+            val payload = json<User>("payload", Json.Default)
+        }
+
+        val newUser = User("Pro", "Alpha")
+        var writtenAsText: EntityID<Int>? = null
+        var writtenAsJson: EntityID<Int>? = null
+
+        withTables(excludeSettings = TestDB.ALL - TestDB.ALL_ORACLE_LIKE, textTester) {
+            val columnDdl = textTester.payload.descriptionDdl()
+            kotlin.test.assertTrue(
+                columnDdl.contains("CLOB"),
+                "The column must be created as a CLOB for this test to exercise anything, but was: $columnDdl"
+            )
+
+            inTopLevelSuspendTransaction {
+                maxAttempts = 1
+                val textId = textTester.insertAndGetId { it[payload] = Json.encodeToString(newUser) }
+                val jsonId = jsonTester.insertAndGetId { it[payload] = newUser }
+                writtenAsText = textId
+                writtenAsJson = jsonId
+
+                for (id in listOf(textId, jsonId)) {
+                    val row = jsonTester.selectAll().where { jsonTester.id eq id }.single()
+                    assertEquals(newUser, row[jsonTester.payload])
+                }
+            }
+
+            inTopLevelSuspendTransaction {
+                maxAttempts = 1
+                for (id in listOf(assertNotNull(writtenAsText), assertNotNull(writtenAsJson))) {
+                    val row = jsonTester.selectAll().where { jsonTester.id eq id }.single()
+                    assertEquals(newUser, row[jsonTester.payload])
+                }
+            }
+        }
+    }
 }