diff --git a/components/nimbus/src/error.rs b/components/nimbus/src/error.rs
index 9372de6dc3..b0704537ba 100644
--- a/components/nimbus/src/error.rs
+++ b/components/nimbus/src/error.rs
@@ -21,8 +21,8 @@ pub enum NimbusError {
     RkvError(#[from] rkv::StoreError),
     #[error("IO error: {0}")]
     IOError(#[from] std::io::Error),
-    #[error("JSON Error: {0}")]
-    JSONError(#[from] serde_json::Error),
+    #[error("JSON Error: {0} — {1}")]
+    JSONError(String, String),
     #[error("EvaluationError: {0}")]
     EvaluationError(String),
     #[error("Invalid Expression - didn't evaluate to a bool")]
@@ -103,6 +103,13 @@ pub enum CirrusClientError {
     RequestMissingParameter(String),
 }
 
+#[cfg(test)]
+impl From<serde_json::Error> for NimbusError {
+    fn from(error: serde_json::Error) -> Self {
+        NimbusError::JSONError("test".into(), error.to_string())
+    }
+}
+
 impl<'a> From<jexl_eval::error::EvaluationError<'a>> for NimbusError {
     fn from(eval_error: jexl_eval::error::EvaluationError<'a>) -> Self {
         NimbusError::EvaluationError(eval_error.to_string())
diff --git a/components/nimbus/src/sampling.rs b/components/nimbus/src/sampling.rs
index 7f564dad00..c1545dfd69 100644
--- a/components/nimbus/src/sampling.rs
+++ b/components/nimbus/src/sampling.rs
@@ -99,7 +99,15 @@ pub(crate) fn ratio_sample<T: serde::Serialize>(input: T, ratios: &[u32]) -> Res
 /// that is larger than 6 bytes (Should never occur)
 pub(crate) fn truncated_hash<T: serde::Serialize>(data: T) -> Result<[u8; 6]> {
     let mut hasher = Sha256::new();
-    let data_str = serde_json::to_string(&data)?;
+    let data_str = match serde_json::to_string(&data) {
+        Ok(v) => v,
+        Err(e) => {
+            return Err(NimbusError::JSONError(
+                "data_str = nimbus::sampling::truncated_hash::serde_json::to_string".into(),
+                e.to_string(),
+            ))
+        }
+    };
     hasher.update(data_str.as_bytes());
     Ok(hasher.finalize()[0..6].try_into()?)
 }
diff --git a/components/nimbus/src/schema.rs b/components/nimbus/src/schema.rs
index 1df9832fe8..7c73f0e67e 100644
--- a/components/nimbus/src/schema.rs
+++ b/components/nimbus/src/schema.rs
@@ -106,7 +106,15 @@ pub fn parse_experiments(payload: &str) -> Result<Vec<Experiment>> {
     // We first encode the response into a `serde_json::Value`
     // to allow us to deserialize each experiment individually,
     // omitting any malformed experiments
-    let value: Value = serde_json::from_str(payload)?;
+    let value: Value = match serde_json::from_str(payload) {
+        Ok(v) => v,
+        Err(e) => {
+            return Err(NimbusError::JSONError(
+                "value = nimbus::schema::parse_experiments::serde_json::from_str".into(),
+                e.to_string(),
+            ))
+        }
+    };
     let data = value
         .get("data")
         .ok_or(NimbusError::InvalidExperimentFormat)?;
diff --git a/components/nimbus/src/stateful/behavior.rs b/components/nimbus/src/stateful/behavior.rs
index 06d46c56c9..320ce8af15 100644
--- a/components/nimbus/src/stateful/behavior.rs
+++ b/components/nimbus/src/stateful/behavior.rs
@@ -357,8 +357,14 @@ impl EventQueryType {
                 self
             )));
         }
-        let event = serde_json::from_value::<String>(args.first().unwrap().clone())?;
-        let interval = serde_json::from_value::<String>(args.get(1).unwrap().clone())?;
+        let event = match serde_json::from_value::<String>(args.first().unwrap().clone()) {
+            Ok(v) => v,
+            Err(e) => return Err(NimbusError::JSONError("event = nimbus::stateful::behavior::EventQueryType::validate_counting_arguments::serde_json::from_value".into(), e.to_string()))
+        };
+        let interval = match serde_json::from_value::<String>(args.get(1).unwrap().clone()) {
+            Ok(v) => v,
+            Err(e) => return Err(NimbusError::JSONError("interval = nimbus::stateful::behavior::EventQueryType::validate_counting_arguments::serde_json::from_value".into(), e.to_string()))
+        };
         let interval = Interval::from_str(&interval)?;
         let num_buckets = match args.get(2).unwrap().as_f64() {
             Some(v) => v,
@@ -393,8 +399,14 @@ impl EventQueryType {
                 self
             )));
         }
-        let event = serde_json::from_value::<String>(args.first().unwrap().clone())?;
-        let interval = serde_json::from_value::<String>(args.get(1).unwrap().clone())?;
+        let event = match serde_json::from_value::<String>(args.first().unwrap().clone()) {
+            Ok(v) => v,
+            Err(e) => return Err(NimbusError::JSONError("event = nimbus::stateful::behavior::EventQueryType::validate_last_seen_arguments::serde_json::from_value".into(), e.to_string()))
+        };
+        let interval = match serde_json::from_value::<String>(args.get(1).unwrap().clone()) {
+            Ok(v) => v,
+            Err(e) => return Err(NimbusError::JSONError("interval = nimbus::stateful::behavior::EventQueryType::validate_last_seen_arguments::serde_json::from_value".into(), e.to_string()))
+        };
         let interval = Interval::from_str(&interval)?;
         let zero = &Value::from(0);
         let starting_bucket = match args.get(2).unwrap_or(zero).as_f64() {
diff --git a/components/nimbus/src/stateful/nimbus_client.rs b/components/nimbus/src/stateful/nimbus_client.rs
index 5f7246355c..1013cbe9c7 100644
--- a/components/nimbus/src/stateful/nimbus_client.rs
+++ b/components/nimbus/src/stateful/nimbus_client.rs
@@ -163,9 +163,12 @@ impl NimbusClient {
             .read_from_db(db)?;
 
         if let Some(recorded_context) = &self.recorded_context {
-            let targeting_helper = self.create_targeting_helper_with_context(serde_json::to_value(
+            let targeting_helper = self.create_targeting_helper_with_context(match serde_json::to_value(
                 &state.targeting_attributes,
-            )?);
+            ) {
+                Ok(v) => v,
+                Err(e) => return Err(NimbusError::JSONError("targeting_helper = nimbus::stateful::nimbus_client::NimbusClient::begin_initialize::serde_json::to_value".into(), e.to_string()))
+            });
             recorded_context.execute_queries(targeting_helper.as_ref())?;
             state
                 .targeting_attributes
@@ -512,7 +515,10 @@ impl NimbusClient {
         let mut buf = String::new();
         file.read_to_string(&mut buf)?;
 
-        let res = serde_json::from_str::<DateTime<Utc>>(&buf)?;
+        let res = match serde_json::from_str::<DateTime<Utc>>(&buf) {
+            Ok(v) => v,
+            Err(e) => return Err(NimbusError::JSONError("res = nimbus::stateful::nimbus_client::get_creation_date_from_path::serde_json::from_str".into(), e.to_string()))
+        };
         Ok(res)
     }
 
@@ -630,7 +636,10 @@ impl NimbusClient {
 
     fn merge_additional_context(&self, context: Option<JsonObject>) -> Result<Value> {
         let context = context.map(Value::Object);
-        let targeting = serde_json::to_value(self.get_targeting_attributes())?;
+        let targeting = match serde_json::to_value(self.get_targeting_attributes()) {
+            Ok(v) => v,
+            Err(e) => return Err(NimbusError::JSONError("targeting = nimbus::stateful::nimbus_client::NimbusClient::merge_additional_context::serde_json::to_value".into(), e.to_string()))
+        };
         let context = match context {
             Some(v) => v.defaults(&targeting)?,
             None => targeting,
diff --git a/components/nimbus/src/stateful/persistence.rs b/components/nimbus/src/stateful/persistence.rs
index f0644babe8..60cfbf3e98 100644
--- a/components/nimbus/src/stateful/persistence.rs
+++ b/components/nimbus/src/stateful/persistence.rs
@@ -157,7 +157,10 @@ impl SingleStore {
         key: &str,
         persisted_data: &T,
     ) -> Result<()> {
-        let persisted_json = serde_json::to_string(persisted_data)?;
+        let persisted_json = match serde_json::to_string(persisted_data) {
+            Ok(v) => v,
+            Err(e) => return Err(NimbusError::JSONError("persisted_json = nimbus::stateful::persistence::SingleStore::put::serde_json::to_string".into(), e.to_string()))
+        };
         self.store
             .put(writer, key, &rkv::Value::Json(&persisted_json))?;
         Ok(())
@@ -187,7 +190,10 @@ impl SingleStore {
         match persisted_data {
             Some(data) => {
                 if let rkv::Value::Json(data) = data {
-                    Ok(Some(serde_json::from_str::<T>(data)?))
+                    Ok(Some(match serde_json::from_str::<T>(data) {
+                        Ok(v) => v,
+                        Err(e) => return Err(NimbusError::JSONError("match persisted_data nimbus::stateful::persistence::SingleStore::get::serde_json::from_str".into(), e.to_string()))
+                    }))
                 } else {
                     Err(NimbusError::InvalidPersistedData)
                 }
@@ -239,7 +245,10 @@ impl SingleStore {
         let mut iter = self.store.iter_start(reader)?;
         while let Some(Ok((_, data))) = iter.next() {
             if let rkv::Value::Json(data) = data {
-                result.push(serde_json::from_str::<T>(data)?);
+                result.push(match serde_json::from_str::<T>(data) {
+                    Ok(v) => v,
+                    Err(e) => return Err(NimbusError::JSONError("rkv::Value::Json(data) nimbus::stateful::persistence::SingleStore::collect_all::serde_json::from_str".into(), e.to_string()))
+                });
             }
         }
         Ok(result)
@@ -510,7 +519,10 @@ impl Database {
         match persisted_data {
             Some(data) => {
                 if let rkv::Value::Json(data) = data {
-                    Ok(Some(serde_json::from_str::<T>(data)?))
+                    Ok(Some(match serde_json::from_str::<T>(data) {
+                        Ok(v) => v,
+                        Err(e) => return Err(NimbusError::JSONError("rkv::Value::Json(data) nimbus::stateful::persistence::Database::get::serde_json::from_str".into(), e.to_string()))
+                    }))
                 } else {
                     Err(NimbusError::InvalidPersistedData)
                 }
@@ -533,7 +545,10 @@ impl Database {
         let mut iter = self.get_store(store_id).store.iter_start(&reader)?;
         while let Some(Ok((_, data))) = iter.next() {
             if let rkv::Value::Json(data) = data {
-                result.push(serde_json::from_str::<T>(data)?);
+                result.push(match serde_json::from_str::<T>(data) {
+                    Ok(v) => v,
+                    Err(e) => return Err(NimbusError::JSONError("rkv::Value::Json(data) nimbus::stateful::persistence::Database::collect_all::serde_json::from_str".into(), e.to_string()))
+                });
             }
         }
         Ok(result)
diff --git a/components/nimbus/src/stateless/cirrus_client.rs b/components/nimbus/src/stateless/cirrus_client.rs
index 49f3999383..a044f52740 100644
--- a/components/nimbus/src/stateless/cirrus_client.rs
+++ b/components/nimbus/src/stateless/cirrus_client.rs
@@ -90,7 +90,10 @@ impl CirrusClient {
         metrics_handler: Box<dyn MetricsHandler>,
         coenrolling_feature_ids: Vec<String>,
     ) -> Result<Self> {
-        let app_context: AppContext = serde_json::from_str(&app_context)?;
+        let app_context: AppContext = match serde_json::from_str(&app_context) {
+            Ok(v) => v,
+            Err(e) => return Err(NimbusError::JSONError("app_context = nimbus::stateless::cirrus_client::CirrusClient::new::serde_json::from_str".into(), e.to_string()))
+        };
         Ok(Self {
             app_context,
             coenrolling_feature_ids,
@@ -112,7 +115,10 @@ impl CirrusClient {
             request_context,
             is_user_participating,
             prev_enrollments,
-        } = serde_json::from_str(request.as_str())?;
+        } = match serde_json::from_str(request.as_str()) {
+            Ok(v) => v,
+            Err(e) => return Err(NimbusError::JSONError("EnrollmentRequest { .. } = nimbus::stateless::cirrus_client::CirrusClient::handle_enrollment::serde_json::from_str".into(), e.to_string()))
+        };
         let client_id = if let Some(client_id) = client_id {
             client_id
         } else {
@@ -121,12 +127,15 @@ impl CirrusClient {
             ));
         };
 
-        Ok(serde_json::to_string(&self.enroll(
+        Ok(match serde_json::to_string(&self.enroll(
             client_id,
             request_context,
             is_user_participating,
             &prev_enrollments,
-        )?)?)
+        )?) {
+            Ok(v) => v,
+            Err(e) => return Err(NimbusError::JSONError("return nimbus::stateless::cirrus_client::CirrusClient::handle_enrollment::serde_json::to_string".into(), e.to_string()))
+        })
     }
 
     pub(crate) fn enroll(
diff --git a/components/nimbus/src/strings.rs b/components/nimbus/src/strings.rs
index 5776c5dade..4691ac43a8 100644
--- a/components/nimbus/src/strings.rs
+++ b/components/nimbus/src/strings.rs
@@ -7,7 +7,15 @@ use serde_json::{value::Value, Map};
 
 #[allow(dead_code)]
 pub fn fmt<T: serde::Serialize>(template: &str, context: &T) -> Result<String> {
-    let obj: Value = serde_json::to_value(context)?;
+    let obj: Value = match serde_json::to_value(context) {
+        Ok(v) => v,
+        Err(e) => {
+            return Err(NimbusError::JSONError(
+                "obj = nimbus::strings::fmt::serde_json::to_value".into(),
+                e.to_string(),
+            ))
+        }
+    };
 
     fmt_with_value(template, &obj)
 }
diff --git a/components/nimbus/src/tests/stateful/client/test_http_client.rs b/components/nimbus/src/tests/stateful/client/test_http_client.rs
index ffe33b9d0d..0de98609c2 100644
--- a/components/nimbus/src/tests/stateful/client/test_http_client.rs
+++ b/components/nimbus/src/tests/stateful/client/test_http_client.rs
@@ -66,7 +66,7 @@ fn test_malformed_payload() {
     "#;
 
     let result = parse_experiments(payload).unwrap_err();
-    assert!(matches!(result, NimbusError::JSONError(_)));
+    assert!(matches!(result, NimbusError::JSONError(_, _)));
 }
 
 // This response body includes a matching schema version, a non-matching schema version,
diff --git a/components/nimbus/src/tests/stateful/test_evaluator.rs b/components/nimbus/src/tests/stateful/test_evaluator.rs
index 3d98e8dcda..f2422e509c 100644
--- a/components/nimbus/src/tests/stateful/test_evaluator.rs
+++ b/components/nimbus/src/tests/stateful/test_evaluator.rs
@@ -158,7 +158,7 @@ fn test_event_transform_sum_cnz_avg_avgnz_parameters() {
             &th,
         ),
         Some(EnrollmentStatus::Error {
-            reason: "EvaluationError: Custom error: JSON Error: invalid type: floating point `1.0`, expected a string"
+            reason: "EvaluationError: Custom error: JSON Error: event = nimbus::stateful::behavior::EventQueryType::validate_counting_arguments::serde_json::from_value — invalid type: floating point `1.0`, expected a string"
                 .to_string()
         })
     );
@@ -168,7 +168,7 @@ fn test_event_transform_sum_cnz_avg_avgnz_parameters() {
             &th,
         ),
         Some(EnrollmentStatus::Error {
-            reason: "EvaluationError: Custom error: JSON Error: invalid type: floating point `1.0`, expected a string"
+            reason: "EvaluationError: Custom error: JSON Error: interval = nimbus::stateful::behavior::EventQueryType::validate_counting_arguments::serde_json::from_value — invalid type: floating point `1.0`, expected a string"
                 .to_string()
         })
     );
@@ -234,7 +234,7 @@ fn test_event_transform_last_seen_parameters() {
             &th,
         ),
         Some(EnrollmentStatus::Error {
-            reason: "EvaluationError: Custom error: JSON Error: invalid type: floating point `1.0`, expected a string"
+            reason: "EvaluationError: Custom error: JSON Error: event = nimbus::stateful::behavior::EventQueryType::validate_last_seen_arguments::serde_json::from_value — invalid type: floating point `1.0`, expected a string"
                 .to_string()
         })
     );
@@ -244,7 +244,7 @@ fn test_event_transform_last_seen_parameters() {
             &th,
         ),
         Some(EnrollmentStatus::Error {
-            reason: "EvaluationError: Custom error: JSON Error: invalid type: floating point `1.0`, expected a string"
+            reason: "EvaluationError: Custom error: JSON Error: interval = nimbus::stateful::behavior::EventQueryType::validate_last_seen_arguments::serde_json::from_value — invalid type: floating point `1.0`, expected a string"
                 .to_string()
         })
     );
diff --git a/components/nimbus/tests/test_restart.rs b/components/nimbus/tests/test_restart.rs
index 23be0fa3b6..f5f4646954 100644
--- a/components/nimbus/tests/test_restart.rs
+++ b/components/nimbus/tests/test_restart.rs
@@ -13,6 +13,7 @@ mod test {
     use super::common::new_test_client_with_db;
     #[cfg(feature = "rkv-safe-mode")]
     use nimbus::error::Result;
+    use nimbus::NimbusError;
     use serde_json::json;
 
     fn experiment_target_false() -> serde_json::Value {
@@ -132,12 +133,15 @@ mod test {
         let temp_dir = tempfile::tempdir()?;
         let client = new_test_client_with_db(&temp_dir)?;
         client.initialize()?;
-        let experiment_json = serde_json::to_string(&json!({
+        let experiment_json = match serde_json::to_string(&json!({
             "data": [
                 experiment_target_false(),
                 experiment_zero_buckets(),
             ]
-        }))?;
+        })) {
+            Ok(v) => v,
+            Err(e) => return Err(NimbusError::JSONError("test".into(), e.to_string())),
+        };
         client.set_experiments_locally(experiment_json.clone())?;
         client.apply_pending_experiments()?;
         // the experiment_target_false experiment has a 'targeting' of "false", we test to ensure that
@@ -180,13 +184,16 @@ mod test {
         let ta = client.get_targeting_attributes();
         assert_eq!(ta.active_experiments, expected);
 
-        let experiment_json = serde_json::to_string(&json!({
+        let experiment_json = match serde_json::to_string(&json!({
             "data": [
                 experiment_target_false(),
                 experiment_zero_buckets(),
                 experiment_always_enroll(),
             ]
-        }))?;
+        })) {
+            Ok(v) => v,
+            Err(e) => return Err(NimbusError::JSONError("test".into(), e.to_string())),
+        };
         client.set_experiments_locally(experiment_json)?;
         client.apply_pending_experiments()?;