diff --git a/README.md b/README.md
index 32dda43..a57e9cd 100644
--- a/README.md
+++ b/README.md
@@ -96,7 +96,9 @@ export interface Props {
 
 ### Using a custom serializer and parser
 
-You can bring your own serializer/parser. For serializing data that `JSON.parse` cannot parse (e.g., Date or BigInt), here's an example of using Rich Harris' `devalue`
+If you want to opt for more complex data, you can bring your custom serializer/parser.
+
+Here's an example of serializing data that `JSON.stringify` cannot (e.g., Date or BigInt) using Rich Harris' [`devalue`](https://github.com/Rich-Harris/devalue):
 
 ```astro
 ---
@@ -125,6 +127,12 @@ export type Data = typeof data;
 </script>
 ```
 
+### Errors & Warning in `deserialize()`
+
+The `deserialize()` function may give you the following:
+1. **ERR: No match found** - there are no `JSON` scripts with the given ID  
+1. **WARNING: Multiple matches for <id>** - there were multiple `JSON` scripts found with the same ID
+
 ## About
 
 This is a quick and easy pattern to embed serialized information into your HTML and make it available in the client-side script with type safety.
diff --git a/src/deserialize.ts b/src/deserialize.ts
index 8d1da46..caefbe2 100644
--- a/src/deserialize.ts
+++ b/src/deserialize.ts
@@ -28,7 +28,7 @@
  * ```
  **/
 export function deserialize<T = any>(id: string, parser?: (serialized: string)=>any): T {
-    const elements = document.querySelectorAll<HTMLScriptElement>(`#${id}`);
+    const elements = document.querySelectorAll<HTMLScriptElement>(`script#${id}[type="application/json"]`);
 
     if (elements?.length > 0) {
         if (elements?.length > 1)