diff --git a/lib/contentstack.js b/lib/contentstack.js
index 9d377999..344898fe 100644
--- a/lib/contentstack.js
+++ b/lib/contentstack.js
@@ -122,7 +122,7 @@ import { getContentstackEndpoint } from '@contentstack/utils'
  * const client = contentstack.client({ logHandler: (level, data) => {
       if (level === 'error' && data) {
         const title = [data.name, data.message].filter((a) => a).join(' - ')
-        console.error(`[error] ${title}`)
+        console.error(`An error occurred due to ${title}. Review the details and try again.`)
         return
       }
       console.log(`[${level}] ${data}`)
diff --git a/lib/contentstackClient.js b/lib/contentstackClient.js
index b7acdecd..3ca17e9f 100644
--- a/lib/contentstackClient.js
+++ b/lib/contentstackClient.js
@@ -26,15 +26,15 @@ export default function contentstackClient ({ http }) {
    * const client = contentstack.client()
    *
    * client.login({ email: <emailid>, password: <password> })
-   * .then(() => console.log('Logged in successfully'))
+   * .then(() => console.log('Login successful.'))
    *
    * @example
    * client.login({ email: <emailid>, password: <password>, tfa_token: <tfa_token> })
-   * .then(() => console.log('Logged in successfully'))
+   * .then(() => console.log('Login successful.'))
    *
    * @example
    * client.login({ email: <emailid>, password: <password>, mfaSecret: <mfa_secret> })
-   * .then(() => console.log('Logged in successfully'))
+   * .then(() => console.log('Login successful.'))
    */
   function login (requestBody = {}, params = {}) {
     http.defaults.versioningStrategy = 'path'
@@ -210,7 +210,7 @@ export default function contentstackClient ({ http }) {
    * const client = contentstack.client()
    *
    * client.oauth({ appId: <appId>, clientId: <clientId>, redirectUri: <redirectUri>, clientSecret: <clientSecret>, responseType: <responseType>, scope: <scope> })
-   * .then(() => console.log('Logged in successfully'))
+   * .then(() => console.log('Login successful.'))
    *
    */
   function oauth (params = {}) {
diff --git a/lib/core/Util.js b/lib/core/Util.js
index 23a2f449..446045dd 100644
--- a/lib/core/Util.js
+++ b/lib/core/Util.js
@@ -1,4 +1,5 @@
 import { platform, release } from 'os'
+import { ERROR_MESSAGES } from './errorMessages'
 
 const HOST_REGEX = /^(?!(?:(?:https?|ftp):\/\/|internal|localhost|(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)))(?:[\w-]+\.contentstack\.(?:io|com)(?::[^\/\s:]+)?|[\w-]+(?:\.[\w-]+)*(?::[^\/\s:]+)?)(?![\/?#])$/  // eslint-disable-line
 
@@ -218,7 +219,7 @@ const isAllowedHost = (hostname) => {
 
 export const validateAndSanitizeConfig = (config) => {
   if (!config?.url || typeof config?.url !== 'string') {
-    throw new Error('Invalid request configuration: missing or invalid URL')
+    throw new Error(ERROR_MESSAGES.INVALID_URL_CONFIG)
   }
 
   // Validate the URL to prevent SSRF attacks
diff --git a/lib/core/concurrency-queue.js b/lib/core/concurrency-queue.js
index 453e29e5..a9f94a67 100644
--- a/lib/core/concurrency-queue.js
+++ b/lib/core/concurrency-queue.js
@@ -1,6 +1,7 @@
 import Axios from 'axios'
 import OAuthHandler from './oauthHandler'
 import { validateAndSanitizeConfig } from './Util'
+import { ERROR_MESSAGES } from './errorMessages'
 
 const defaultConfig = {
   maxRequests: 5,
@@ -45,23 +46,23 @@ const defaultConfig = {
  */
 export function ConcurrencyQueue ({ axios, config }) {
   if (!axios) {
-    throw Error('Axios instance is not present')
+    throw Error(ERROR_MESSAGES.AXIOS_INSTANCE_MISSING)
   }
 
   if (config) {
     if (config.maxRequests && config.maxRequests <= 0) {
-      throw Error('Concurrency Manager Error: minimum concurrent requests is 1')
+      throw Error(ERROR_MESSAGES.MIN_CONCURRENT_REQUESTS)
     } else if (config.retryLimit && config.retryLimit <= 0) {
-      throw Error('Retry Policy Error: minimum retry limit is 1')
+      throw Error(ERROR_MESSAGES.MIN_RETRY_LIMIT)
     } else if (config.retryDelay && config.retryDelay < 300) {
-      throw Error('Retry Policy Error: minimum retry delay for requests is 300')
+      throw Error(ERROR_MESSAGES.MIN_RETRY_DELAY)
     }
     // Validate network retry configuration
     if (config.maxNetworkRetries && config.maxNetworkRetries < 0) {
       throw Error('Network Retry Policy Error: maxNetworkRetries cannot be negative')
     }
     if (config.networkRetryDelay && config.networkRetryDelay < 50) {
-      throw Error('Network Retry Policy Error: minimum network retry delay is 50ms')
+      throw Error(ERROR_MESSAGES.MIN_NETWORK_RETRY_DELAY)
     }
   }
 
diff --git a/lib/core/contentstackHTTPClient.js b/lib/core/contentstackHTTPClient.js
index ca41ea8c..2851747b 100644
--- a/lib/core/contentstackHTTPClient.js
+++ b/lib/core/contentstackHTTPClient.js
@@ -3,6 +3,7 @@ import clonedeep from 'lodash/cloneDeep'
 import Qs from 'qs'
 import { ConcurrencyQueue } from './concurrency-queue'
 import { isHost } from './Util'
+import { ERROR_MESSAGES } from './errorMessages'
 
 export default function contentstackHttpClient (options) {
   const defaultConfig = {
@@ -11,7 +12,7 @@ export default function contentstackHttpClient (options) {
     logHandler: (level, data) => {
       if (level === 'error' && data) {
         const title = [data.name, data.message].filter((a) => a).join(' - ')
-        console.error(`[error] ${title}`)
+        console.error(ERROR_MESSAGES.ERROR_WITH_TITLE(title))
         return
       }
       console.log(`[${level}] ${data}`)
diff --git a/lib/core/errorMessages.js b/lib/core/errorMessages.js
new file mode 100644
index 00000000..e1a7a8f8
--- /dev/null
+++ b/lib/core/errorMessages.js
@@ -0,0 +1,40 @@
+/**
+ * Centralized error messages for the Contentstack Management SDK.
+ * All user-facing error messages should be defined here for consistency and maintainability.
+ */
+
+export const ERROR_MESSAGES = {
+  // Asset errors
+  ASSET_URL_REQUIRED: 'Asset URL is required. Provide a valid asset URL and try again.',
+  INVALID_UPLOAD_FORMAT: 'Invalid upload format. Provide a valid file path or Buffer and try again.',
+
+  // OAuth errors
+  OAUTH_BASE_URL_NOT_SET: 'OAuth base URL is not configured. Set the OAuth base URL and try again.',
+  NO_REFRESH_TOKEN: 'No refresh token available. Authenticate first and try again.',
+  ACCESS_TOKEN_REQUIRED: 'Access token is required. Provide a valid access token and try again.',
+  REFRESH_TOKEN_REQUIRED: 'Refresh token is required. Provide a valid refresh token and try again.',
+  ORGANIZATION_UID_REQUIRED: 'Organization UID is required. Provide a valid organization UID and try again.',
+  USER_UID_REQUIRED: 'User UID is required. Provide a valid user UID and try again.',
+  TOKEN_EXPIRY_REQUIRED: 'Token expiry time is required. Provide a valid expiry time and try again.',
+  AUTH_CODE_NOT_FOUND: 'Authorization code not found in redirect URL. Verify the redirect URL and try again.',
+  NO_USER_AUTHORIZATIONS: 'No authorizations found for the current user. Verify user permissions and try again.',
+  NO_APP_AUTHORIZATIONS: 'No authorizations found for the app. Verify app configuration and try again.',
+
+  // Concurrency queue errors
+  AXIOS_INSTANCE_MISSING: 'Axios instance is not present. Initialize the HTTP client and try again.',
+  MIN_CONCURRENT_REQUESTS: 'Concurrency Manager Error: Minimum concurrent requests must be at least 1.',
+  MIN_RETRY_LIMIT: 'Retry Policy Error: Minimum retry limit must be at least 1.',
+  MIN_RETRY_DELAY: 'Retry Policy Error: Minimum retry delay must be at least 300ms.',
+  MIN_NETWORK_RETRY_DELAY: 'Network Retry Policy Error: Minimum network retry delay must be at least 50ms.',
+
+  // Request configuration errors
+  INVALID_URL_CONFIG: 'Invalid request configuration: URL is missing or invalid. Provide a valid URL and try again.',
+
+  // General errors
+  ERROR_WITH_TITLE: (title) => `An error occurred due to ${title}. Review the details and try again.`,
+
+  // Content type errors
+  PARAMETER_NAME_REQUIRED: 'Parameter name is required. Provide a valid parameter name and try again.'
+}
+
+export default ERROR_MESSAGES
diff --git a/lib/core/oauthHandler.js b/lib/core/oauthHandler.js
index 71cac609..6d64b586 100644
--- a/lib/core/oauthHandler.js
+++ b/lib/core/oauthHandler.js
@@ -1,4 +1,5 @@
 import errorFormatter from './contentstackError'
+import { ERROR_MESSAGES } from './errorMessages'
 
 /**
  * @description OAuthHandler class to handle OAuth authorization and token management
@@ -91,7 +92,7 @@ export default class OAuthHandler {
   async authorize () {
     try {
       if (!this.OAuthBaseURL) {
-        throw new Error('OAuthBaseURL is not set')
+        throw new Error(ERROR_MESSAGES.OAUTH_BASE_URL_NOT_SET)
       }
       const baseUrl = `${this.OAuthBaseURL}/#!/apps/${this.appId}/authorize`
       const authUrl = new URL(baseUrl)
@@ -171,7 +172,7 @@ export default class OAuthHandler {
     const refreshToken = providedRefreshToken || this.axiosInstance.oauth.refreshToken
 
     if (!refreshToken) {
-      throw new Error('No refresh token available. Please authenticate first.')
+      throw new Error(ERROR_MESSAGES.NO_REFRESH_TOKEN)
     }
 
     const body = new URLSearchParams({
@@ -308,7 +309,7 @@ export default class OAuthHandler {
    */
   setAccessToken (token) {
     if (!token) {
-      throw new Error('Access token is required')
+      throw new Error(ERROR_MESSAGES.ACCESS_TOKEN_REQUIRED)
     }
     this.axiosInstance.oauth.accessToken = token
   }
@@ -327,7 +328,7 @@ export default class OAuthHandler {
    */
   setRefreshToken (token) {
     if (!token) {
-      throw new Error('Refresh token is required')
+      throw new Error(ERROR_MESSAGES.REFRESH_TOKEN_REQUIRED)
     }
     this.axiosInstance.oauth.refreshToken = token
   }
@@ -346,7 +347,7 @@ export default class OAuthHandler {
    */
   setOrganizationUID (organizationUID) {
     if (!organizationUID) {
-      throw new Error('Organization UID is required')
+      throw new Error(ERROR_MESSAGES.ORGANIZATION_UID_REQUIRED)
     }
     this.axiosInstance.oauth.organizationUID = organizationUID
   }
@@ -365,7 +366,7 @@ export default class OAuthHandler {
    */
   setUserUID (userUID) {
     if (!userUID) {
-      throw new Error('User UID is required')
+      throw new Error(ERROR_MESSAGES.USER_UID_REQUIRED)
     }
     this.axiosInstance.oauth.userUID = userUID
   }
@@ -384,7 +385,7 @@ export default class OAuthHandler {
    */
   setTokenExpiryTime (expiryTime) {
     if (!expiryTime) {
-      throw new Error('Token expiry time is required')
+      throw new Error(ERROR_MESSAGES.TOKEN_EXPIRY_REQUIRED)
     }
     this.axiosInstance.oauth.tokenExpiryTime = expiryTime
   }
@@ -414,7 +415,7 @@ export default class OAuthHandler {
         errorFormatter(error)
       }
     } else {
-      throw new Error('Authorization code not found in redirect URL.')
+      throw new Error(ERROR_MESSAGES.AUTH_CODE_NOT_FOUND)
     }
   }
 
@@ -443,11 +444,11 @@ export default class OAuthHandler {
         const userUid = this.axiosInstance.oauth.userUID
         const currentUserAuthorization = data?.data?.filter((element) => element.user.uid === userUid) || []
         if (currentUserAuthorization.length === 0) {
-          throw new Error('No authorizations found for current user!')
+          throw new Error(ERROR_MESSAGES.NO_USER_AUTHORIZATIONS)
         }
         return currentUserAuthorization[0].authorization_uid // filter authorizations by current logged in user
       } else {
-        throw new Error('No authorizations found for the app!')
+        throw new Error(ERROR_MESSAGES.NO_APP_AUTHORIZATIONS)
       }
     } catch (error) {
       errorFormatter(error)
diff --git a/lib/stack/asset/index.js b/lib/stack/asset/index.js
index 69e81484..5dc0ec7e 100644
--- a/lib/stack/asset/index.js
+++ b/lib/stack/asset/index.js
@@ -10,6 +10,7 @@ import {
   unpublish } from '../../entity'
 import { Folder } from './folders'
 import error from '../../core/contentstackError'
+import { ERROR_MESSAGES } from '../../core/errorMessages'
 import FormData from 'form-data'
 import { createReadStream } from 'fs'
 
@@ -289,7 +290,7 @@ export function Asset (http, data = {}) {
       } || { responseType }
       const requestUrl = url || this.url
       if (!requestUrl || requestUrl === undefined) {
-        throw new Error('Asset URL can not be empty')
+        throw new Error(ERROR_MESSAGES.ASSET_URL_REQUIRED)
       }
       return http.get(requestUrl, headers)
     } catch (err) {
@@ -338,7 +339,7 @@ export function createFormData (data) {
         formData.append('asset[upload]', uploadStream)
       }
     } else {
-      throw new Error('Invalid upload format. Must be a file path or Buffer.')
+      throw new Error(ERROR_MESSAGES.INVALID_UPLOAD_FORMAT)
     }
     return formData
   }
diff --git a/lib/stack/contentType/index.js b/lib/stack/contentType/index.js
index aaa2b0e5..ffd50f1f 100644
--- a/lib/stack/contentType/index.js
+++ b/lib/stack/contentType/index.js
@@ -10,6 +10,7 @@ import {
 } from '../../entity'
 import { Entry } from './entry/index'
 import error from '../../core/contentstackError'
+import { ERROR_MESSAGES } from '../../core/errorMessages'
 
 import FormData from 'form-data'
 import { createReadStream } from 'fs'
@@ -214,7 +215,7 @@ export function ContentType (http, data = {}) {
     */
     this.generateUid = (name) => {
       if (!name) {
-        throw new TypeError('Expected parameter name')
+        throw new TypeError(ERROR_MESSAGES.PARAMETER_NAME_REQUIRED)
       }
       return name.replace(/[^A-Z0-9]+/gi, '_').toLowerCase()
     }
diff --git a/test/unit/asset-test.js b/test/unit/asset-test.js
index 3970b200..6a7171cb 100644
--- a/test/unit/asset-test.js
+++ b/test/unit/asset-test.js
@@ -401,7 +401,7 @@ describe('Contentstack Asset test', () => {
         done()
       })
       .catch((err) => {
-        expect(err.message).to.be.equal('Asset URL can not be empty')
+        expect(err.message).to.be.equal('Asset URL is required. Provide a valid asset URL and try again.')
         done()
       })
   })
@@ -415,7 +415,7 @@ describe('Contentstack Asset test', () => {
     })
       .download({ responseType: 'blob' })
       .catch((err) => {
-        expect(err.message).to.be.equal('Asset URL can not be empty')
+        expect(err.message).to.be.equal('Asset URL is required. Provide a valid asset URL and try again.')
         done()
       })
   })
diff --git a/test/unit/concurrency-Queue-test.js b/test/unit/concurrency-Queue-test.js
index 6ccf4831..4871fec1 100644
--- a/test/unit/concurrency-Queue-test.js
+++ b/test/unit/concurrency-Queue-test.js
@@ -189,7 +189,7 @@ describe('Concurrency queue test', () => {
       new ConcurrencyQueue({ axios: undefined })
       expect.fail('Undefined axios should fail')
     } catch (error) {
-      expect(error.message).to.be.equal('Axios instance is not present')
+      expect(error.message).to.be.equal('Axios instance is not present. Initialize the HTTP client and try again.')
       done()
     }
   })
@@ -232,7 +232,7 @@ describe('Concurrency queue test', () => {
       makeConcurrencyQueue({ maxRequests: -10 })
       expect.fail('Negative concurrency queue should fail')
     } catch (error) {
-      expect(error.message).to.be.equal('Concurrency Manager Error: minimum concurrent requests is 1')
+      expect(error.message).to.be.equal('Concurrency Manager Error: Minimum concurrent requests must be at least 1.')
       done()
     }
   })
@@ -242,7 +242,7 @@ describe('Concurrency queue test', () => {
       makeConcurrencyQueue({ retryLimit: -10 })
       expect.fail('Negative retry limit should fail')
     } catch (error) {
-      expect(error.message).to.be.equal('Retry Policy Error: minimum retry limit is 1')
+      expect(error.message).to.be.equal('Retry Policy Error: Minimum retry limit must be at least 1.')
       done()
     }
   })
@@ -252,7 +252,7 @@ describe('Concurrency queue test', () => {
       makeConcurrencyQueue({ retryDelay: 10 })
       expect.fail('Retry delay should be min 300ms')
     } catch (error) {
-      expect(error.message).to.be.equal('Retry Policy Error: minimum retry delay for requests is 300')
+      expect(error.message).to.be.equal('Retry Policy Error: Minimum retry delay must be at least 300ms.')
       done()
     }
   })
diff --git a/test/unit/contentType-test.js b/test/unit/contentType-test.js
index a1be2162..6624bb20 100644
--- a/test/unit/contentType-test.js
+++ b/test/unit/contentType-test.js
@@ -88,7 +88,7 @@ describe('Contentstack ContentType test', () => {
 
   it('ContentType generate UID from content type name test', done => {
     const contentType = makeContentType()
-    expect(contentType.generateUid.bind(contentType, null)).to.throw('Expected parameter name')
+    expect(contentType.generateUid.bind(contentType, null)).to.throw('Parameter name is required. Provide a valid parameter name and try again.')
     expect(contentType.generateUid('Test Name')).to.be.equal('test_name')
     expect(contentType.generateUid('Test @Name')).to.be.equal('test_name')
     expect(contentType.generateUid('12 Test Name')).to.be.equal('12_test_name')
diff --git a/test/unit/oauthHandler-test.js b/test/unit/oauthHandler-test.js
index 5088a303..e1e774ef 100644
--- a/test/unit/oauthHandler-test.js
+++ b/test/unit/oauthHandler-test.js
@@ -288,7 +288,7 @@ describe('OAuthHandler', () => {
         await oauthHandler.getOauthAppAuthorization()
         throw new Error('Expected error not thrown')
       } catch (error) {
-        expect(error.message).to.equal('No authorizations found for current user!')
+        expect(error.message).to.equal('No authorizations found for the current user. Verify user permissions and try again.')
       }
     })
 
@@ -301,7 +301,7 @@ describe('OAuthHandler', () => {
         await oauthHandler.getOauthAppAuthorization()
         throw new Error('Expected error not thrown')
       } catch (error) {
-        expect(error.message).to.equal('No authorizations found for the app!')
+        expect(error.message).to.equal('No authorizations found for the app. Verify app configuration and try again.')
       }
     })
   })