Added deprecation notice in CHANGELOG and README.

CHANGELOG.md

@@ -1,4 +1,10 @@
-# Changelog
+# CHANGELOG
+
+### **APR-09-2026**
+
+#### Documentation
+
+- Add deprecation notice and migration guidance to the Content Delivery API. See [DEPRECATION.md](DEPRECATION.md).
 
 ## v1.1.1
 

DEPRECATION.md

@@ -0,0 +1,27 @@
+# Deprecation notice: Contentstack Dart Utils (pub.dev)
+
+This page is for **developers using the Contentstack Dart Utils** package published on **pub.dev** as [`contentstack_utils`](https://pub.dev/packages/contentstack_utils).
+
+## What this means for you
+
+**We are deprecating this package as the recommended path for new Dart and Flutter work.** If you are **starting a new project**, use our **[Content Delivery API (CDA)](https://www.contentstack.com/docs/developers/apis/content-delivery-api/)** and implement rich text / JSON RTE handling in your app using current product documentation.
+
+**If you already ship an app** that depends on `contentstack_utils`, you can **keep using it**. Your integration continues to work. Plan migration when it fits your release schedule—you do not have to change immediately.
+
+The **[Contentstack Dart SDK](https://github.com/contentstack/contentstack-dart)** is deprecated on the same timeline; see that repository’s **DEPRECATION.md**.
+
+## What to use for new projects
+
+| | Link |
+|---|------|
+| **Content Delivery API** | [Content Delivery API documentation](https://www.contentstack.com/docs/developers/apis/content-delivery-api/) |
+
+## Why we are making this change
+
+We are focusing investment on **direct API usage** and **documented integration patterns** for Dart and Flutter. This repository will remain in **maintenance**: we may address critical or security issues where we can, but **we do not plan new features** in this package.
+
+## Support for this package going forward
+
+This repository will stay in **maintenance** as described above. Feature work and new capabilities should be built against the **Content Delivery API** and your application code.
+
+If you need help choosing a migration path or timing, contact **[Contentstack support](https://www.contentstack.com/)** or your account team.

README.md

@@ -1,4 +1,10 @@
-# A Contentstack-Utils library for Dart developers
+# ![Contentstack](https://www.contentstack.com/docs/static/images/contentstack.png)
+
+## Important: Dart Utils and pub.dev
+
+**We are deprecating** the **Contentstack Utils** Dart package on pub.dev as the supported path for **new** development. **New Dart or Flutter projects should use the [Content Delivery API](https://www.contentstack.com/docs/developers/apis/content-delivery-api/)** and your own handling for rich text / JSON RTE, following current documentation.
+
+**Already using this package?** You can keep shipping with your current dependencies and migrate when it makes sense for your app. More detail: **[DEPRECATION.md](DEPRECATION.md)**.
 
 ![Coverage](https://github.com/contentstack/contentstack-utils-dart/blob/master/coverage_badge.svg?sanitize=true)