diff --git a/packages/core/src/common/queries/errors.ts b/packages/core/src/common/queries/errors.ts
new file mode 100644
index 0000000..b6eb7e5
--- /dev/null
+++ b/packages/core/src/common/queries/errors.ts
@@ -0,0 +1,4 @@
+
+export class DeserializeError extends Error {}
+
+export class SerializeError extends Error {}
diff --git a/packages/core/src/common/queries/index.ts b/packages/core/src/common/queries/index.ts
index 70ffab8..3567d32 100644
--- a/packages/core/src/common/queries/index.ts
+++ b/packages/core/src/common/queries/index.ts
@@ -1,2 +1,3 @@
 export * from './common';
+export * from './errors';
 export * as queryMediaTypes from './media-types';
diff --git a/packages/core/src/common/queries/media-types/application/x-www-form-urlencoded.ts b/packages/core/src/common/queries/media-types/application/x-www-form-urlencoded.ts
index 72b42e5..984a576 100644
--- a/packages/core/src/common/queries/media-types/application/x-www-form-urlencoded.ts
+++ b/packages/core/src/common/queries/media-types/application/x-www-form-urlencoded.ts
@@ -5,6 +5,11 @@ import {
 	QueryOrGrouping,
 } from '../../common';
 
+import {
+	DeserializeError,
+	SerializeError,
+} from '../../errors';
+
 interface ProcessEntryBase {
 	type: string;
 }
@@ -34,10 +39,12 @@ interface ProcessEntryBoolean extends ProcessEntryBase {
 	truthyStrings?: string[];
 }
 
-export type ProcessEntry = ProcessEntryString | ProcessEntryNumber | ProcessEntryBoolean;
+type ProcessEntry = ProcessEntryString | ProcessEntryNumber | ProcessEntryBoolean;
 
 export const name = 'application/x-www-form-urlencoded' as const;
 
+class DeserializeInvalidFormatError extends DeserializeError {}
+
 const normalizeRhs = (lhs: string, rhs: string, processEntriesMap?: Record<string, ProcessEntry>) => {
 	const defaultCoerceValues = {
 		type: 'string'
@@ -107,7 +114,7 @@ const normalizeRhs = (lhs: string, rhs: string, processEntriesMap?: Record<strin
 	}
 
 	const unknownCoerceValues = coerceValues as unknown as Record<string, string>;
-	throw new Error(`Invalid coercion type: ${unknownCoerceValues.type}`);
+	throw new DeserializeInvalidFormatError(`Invalid coercion type: ${unknownCoerceValues.type}`);
 	// this will be sent to the data source, e.g., the SQL query
 	// we can also make this function act as a "sanitizer"
 }
@@ -186,6 +193,8 @@ export const deserialize: QueryMediaType<
 	)
 };
 
+class SerializeInvalidExpressionError extends SerializeError {}
+
 const serializeExpression = (ex2: QueryAnyExpression) => {
 	if ('name' in ex2) {
 		return [ex2.name, `(${ex2.args.map((s) => s.toString()).join(',')})`];
@@ -193,7 +202,7 @@ const serializeExpression = (ex2: QueryAnyExpression) => {
 
 	if (ex2.rhs instanceof RegExp) {
 		if (ex2.operator !== 'REGEXP') {
-			throw new Error(`Invalid rhs given for operator: ${ex2.lhs} ${ex2.operator} <rhs>`);
+			throw new SerializeInvalidExpressionError(`Invalid rhs given for operator: ${ex2.lhs} ${ex2.operator} <rhs>`);
 		}
 
 		return [ex2.lhs, ex2.rhs.toString()];
@@ -210,7 +219,7 @@ const serializeExpression = (ex2: QueryAnyExpression) => {
 				default:
 					break;
 			}
-			throw new Error(`Invalid operator given for lhs: ${ex2.lhs} <op> ${ex2.rhs}`);
+			throw new SerializeInvalidExpressionError(`Invalid operator given for lhs: ${ex2.lhs} <op> ${ex2.rhs}`);
 		}
 		case 'number': {
 			return [ex2.lhs, ex2.rhs.toString()];
@@ -222,7 +231,7 @@ const serializeExpression = (ex2: QueryAnyExpression) => {
 			break;
 	}
 
-	throw new Error(`Unknown type for rhs: ${ex2.lhs} ${ex2.operator} <rhs>`);
+	throw new SerializeInvalidExpressionError(`Unknown type for rhs: ${ex2.lhs} ${ex2.operator} <rhs>`);
 };
 
 export const serialize: QueryMediaType<