diff --git a/bindings/nodejs/CHANGELOG.md b/bindings/nodejs/CHANGELOG.md
index f1ac21596a..399e260f7b 100644
--- a/bindings/nodejs/CHANGELOG.md
+++ b/bindings/nodejs/CHANGELOG.md
@@ -21,12 +21,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## 1.0.2 - 2023-MM-DD
 
+### Changed
+
+- Private properties on classes are now readonly;
+
 ### Fixed
 
 - Constructor types in `RegularTransactionEssence`;
 - `SenderFeature.getSender()` and `IssuerFeature.getIssuer()` now return the correct types;
 
-
 ## 1.0.1 - 2023-07-25
 
 ### Changed
diff --git a/bindings/nodejs/lib/types/block/address.ts b/bindings/nodejs/lib/types/block/address.ts
index e011adc1e7..ff3da06b8b 100644
--- a/bindings/nodejs/lib/types/block/address.ts
+++ b/bindings/nodejs/lib/types/block/address.ts
@@ -12,7 +12,7 @@ enum AddressType {
 }
 
 abstract class Address {
-    private type: AddressType;
+    readonly type: AddressType;
 
     constructor(type: AddressType) {
         this.type = type;
@@ -44,7 +44,7 @@ abstract class Address {
  * Ed25519 Address.
  */
 class Ed25519Address extends Address {
-    private pubKeyHash: HexEncodedString;
+    readonly pubKeyHash: HexEncodedString;
 
     constructor(address: HexEncodedString) {
         super(AddressType.Ed25519);
@@ -63,7 +63,7 @@ class Ed25519Address extends Address {
 }
 
 class AliasAddress extends Address {
-    private aliasId: AliasId;
+    readonly aliasId: AliasId;
     constructor(address: AliasId) {
         super(AddressType.Alias);
         this.aliasId = address;
@@ -83,7 +83,7 @@ class AliasAddress extends Address {
  * NFT address.
  */
 class NftAddress extends Address {
-    private nftId: NftId;
+    readonly nftId: NftId;
     constructor(address: NftId) {
         super(AddressType.Nft);
         this.nftId = address;
diff --git a/bindings/nodejs/lib/types/block/input/input.ts b/bindings/nodejs/lib/types/block/input/input.ts
index 9f4a2c4210..661d737be8 100644
--- a/bindings/nodejs/lib/types/block/input/input.ts
+++ b/bindings/nodejs/lib/types/block/input/input.ts
@@ -14,7 +14,7 @@ enum InputType {
 }
 
 abstract class Input {
-    private type: InputType;
+    readonly type: InputType;
 
     constructor(type: InputType) {
         this.type = type;
diff --git a/bindings/nodejs/lib/types/block/output/feature.ts b/bindings/nodejs/lib/types/block/output/feature.ts
index dca61347f4..41a042b82f 100644
--- a/bindings/nodejs/lib/types/block/output/feature.ts
+++ b/bindings/nodejs/lib/types/block/output/feature.ts
@@ -15,7 +15,8 @@ enum FeatureType {
 }
 
 abstract class Feature {
-    private type: FeatureType;
+    readonly type: FeatureType;
+
     constructor(type: FeatureType) {
         this.type = type;
     }
@@ -33,7 +34,8 @@ class SenderFeature extends Feature {
     @Type(() => Address, {
         discriminator: AddressDiscriminator,
     })
-    private address: Address;
+    readonly address: Address;
+
     constructor(sender: Address) {
         super(FeatureType.Sender);
         this.address = sender;
@@ -52,7 +54,8 @@ class IssuerFeature extends Feature {
     @Type(() => Address, {
         discriminator: AddressDiscriminator,
     })
-    private address: Address;
+    readonly address: Address;
+
     constructor(issuer: Address) {
         super(FeatureType.Issuer);
         this.address = issuer;
@@ -68,7 +71,8 @@ class IssuerFeature extends Feature {
  * Metadata feature.
  */
 class MetadataFeature extends Feature {
-    private data: string;
+    readonly data: string;
+
     constructor(data: string) {
         super(FeatureType.Metadata);
         this.data = data;
@@ -84,7 +88,8 @@ class MetadataFeature extends Feature {
  * Tag feature.
  */
 class TagFeature extends Feature {
-    private tag: string;
+    readonly tag: string;
+
     constructor(tag: string) {
         super(FeatureType.Tag);
         this.tag = tag;
diff --git a/bindings/nodejs/lib/types/block/output/output.ts b/bindings/nodejs/lib/types/block/output/output.ts
index 8186236c4b..b7ba62f3cc 100644
--- a/bindings/nodejs/lib/types/block/output/output.ts
+++ b/bindings/nodejs/lib/types/block/output/output.ts
@@ -27,9 +27,9 @@ enum OutputType {
 }
 
 abstract class Output /*implements ICommonOutput*/ {
-    private amount: string;
+    readonly amount: string;
 
-    private type: OutputType;
+    readonly type: OutputType;
 
     constructor(type: OutputType, amount: bigint | string) {
         this.type = type;
@@ -80,14 +80,14 @@ abstract class CommonOutput extends Output /*implements ICommonOutput*/ {
     @Type(() => UnlockCondition, {
         discriminator: UnlockConditionDiscriminator,
     })
-    private unlockConditions: UnlockCondition[];
+    readonly unlockConditions: UnlockCondition[];
 
-    private nativeTokens?: INativeToken[];
+    readonly nativeTokens?: INativeToken[];
 
     @Type(() => Feature, {
         discriminator: FeatureDiscriminator,
     })
-    private features?: Feature[];
+    readonly features?: Feature[];
 
     constructor(
         type: OutputType,
@@ -149,7 +149,7 @@ abstract class ImmutableFeaturesOutput extends CommonOutput {
     @Type(() => Feature, {
         discriminator: FeatureDiscriminator,
     })
-    private immutableFeatures?: Feature[];
+    readonly immutableFeatures?: Feature[];
 
     constructor(
         type: OutputType,
@@ -167,7 +167,7 @@ abstract class ImmutableFeaturesOutput extends CommonOutput {
 }
 
 abstract class StateMetadataOutput extends ImmutableFeaturesOutput /*implements IBasicOutput*/ {
-    private stateMetadata?: HexEncodedString;
+    readonly stateMetadata?: HexEncodedString;
 
     constructor(
         type: OutputType,
@@ -185,9 +185,9 @@ abstract class StateMetadataOutput extends ImmutableFeaturesOutput /*implements
 }
 
 class AliasOutput extends StateMetadataOutput /*implements IAliasOutput*/ {
-    private aliasId: HexEncodedString;
-    private stateIndex: number;
-    private foundryCounter: number;
+    readonly aliasId: HexEncodedString;
+    readonly stateIndex: number;
+    readonly foundryCounter: number;
 
     constructor(
         unlockConditions: UnlockCondition[],
@@ -225,7 +225,7 @@ class AliasOutput extends StateMetadataOutput /*implements IAliasOutput*/ {
  * NFT output.
  */
 class NftOutput extends ImmutableFeaturesOutput /*implements INftOutput*/ {
-    private nftId: HexEncodedString;
+    readonly nftId: HexEncodedString;
 
     constructor(
         amount: bigint,
@@ -247,12 +247,12 @@ class NftOutput extends ImmutableFeaturesOutput /*implements INftOutput*/ {
  * Foundry output.
  */
 class FoundryOutput extends ImmutableFeaturesOutput /*implements IFoundryOutput*/ {
-    private serialNumber: number;
+    readonly serialNumber: number;
 
     @Type(() => TokenScheme, {
         discriminator: TokenSchemeDiscriminator,
     })
-    private tokenScheme: TokenScheme;
+    readonly tokenScheme: TokenScheme;
 
     constructor(
         amount: bigint,
diff --git a/bindings/nodejs/lib/types/block/output/token-scheme.ts b/bindings/nodejs/lib/types/block/output/token-scheme.ts
index fd46c25cb6..0602ab43a2 100644
--- a/bindings/nodejs/lib/types/block/output/token-scheme.ts
+++ b/bindings/nodejs/lib/types/block/output/token-scheme.ts
@@ -8,7 +8,7 @@ enum TokenSchemeType {
 }
 
 abstract class TokenScheme {
-    private type: TokenSchemeType;
+    readonly type: TokenSchemeType;
 
     constructor(type: TokenSchemeType) {
         this.type = type;
@@ -26,9 +26,9 @@ abstract class TokenScheme {
  * Simple token scheme.
  */
 class SimpleTokenScheme extends TokenScheme {
-    private mintedTokens: bigint;
-    private meltedTokens: bigint;
-    private maximumSupply: bigint;
+    readonly mintedTokens: bigint;
+    readonly meltedTokens: bigint;
+    readonly maximumSupply: bigint;
 
     constructor(
         mintedTokens: bigint,
diff --git a/bindings/nodejs/lib/types/block/output/unlock-condition.ts b/bindings/nodejs/lib/types/block/output/unlock-condition.ts
index 6b3a8d2397..d6595e070e 100644
--- a/bindings/nodejs/lib/types/block/output/unlock-condition.ts
+++ b/bindings/nodejs/lib/types/block/output/unlock-condition.ts
@@ -18,7 +18,7 @@ enum UnlockConditionType {
 }
 
 abstract class UnlockCondition {
-    private type: UnlockConditionType;
+    readonly type: UnlockConditionType;
 
     constructor(type: UnlockConditionType) {
         this.type = type;
@@ -75,7 +75,8 @@ class AddressUnlockCondition extends UnlockCondition /*implements IAddressUnlock
     @Type(() => Address, {
         discriminator: AddressDiscriminator,
     })
-    private address: Address;
+    readonly address: Address;
+
     constructor(address: Address) {
         super(UnlockConditionType.Address);
         this.address = address;
@@ -92,12 +93,12 @@ class AddressUnlockCondition extends UnlockCondition /*implements IAddressUnlock
  * Storage Deposit Return Unlock Condition.
  */
 class StorageDepositReturnUnlockCondition extends UnlockCondition /*implements IStorageDepositReturnUnlockCondition*/ {
-    private amount: string;
+    readonly amount: string;
 
     @Type(() => Address, {
         discriminator: AddressDiscriminator,
     })
-    private returnAddress: Address;
+    readonly returnAddress: Address;
 
     constructor(returnAddress: Address, amount: bigint | string) {
         super(UnlockConditionType.StorageDepositReturn);
@@ -126,7 +127,7 @@ class StorageDepositReturnUnlockCondition extends UnlockCondition /*implements I
  * Timelock Unlock Condition.
  */
 class TimelockUnlockCondition extends UnlockCondition /*implements ITimelockUnlockCondition*/ {
-    private unixTime: number;
+    readonly unixTime: number;
 
     constructor(unixTime: number) {
         super(UnlockConditionType.Timelock);
@@ -144,8 +145,8 @@ class ExpirationUnlockCondition extends UnlockCondition /*implements IExpiration
     @Type(() => Address, {
         discriminator: AddressDiscriminator,
     })
-    private returnAddress: Address;
-    private unixTime: number;
+    readonly returnAddress: Address;
+    readonly unixTime: number;
 
     constructor(returnAddress: Address, unixTime: number) {
         super(UnlockConditionType.Expiration);
@@ -174,7 +175,7 @@ class StateControllerAddressUnlockCondition extends UnlockCondition /*implements
     @Type(() => Address, {
         discriminator: AddressDiscriminator,
     })
-    private address: Address;
+    readonly address: Address;
     constructor(address: Address) {
         super(UnlockConditionType.StateControllerAddress);
         this.address = address;
@@ -194,7 +195,7 @@ class GovernorAddressUnlockCondition extends UnlockCondition /*implements IGover
     @Type(() => Address, {
         discriminator: AddressDiscriminator,
     })
-    private address: Address;
+    readonly address: Address;
     constructor(address: Address) {
         super(UnlockConditionType.GovernorAddress);
         this.address = address;
@@ -214,7 +215,8 @@ class ImmutableAliasAddressUnlockCondition extends UnlockCondition /*implements
     @Type(() => Address, {
         discriminator: AddressDiscriminator,
     })
-    private address: Address;
+    readonly address: Address;
+
     constructor(address: AliasAddress) {
         super(UnlockConditionType.ImmutableAliasAddress);
         this.address = address;
diff --git a/bindings/nodejs/lib/types/block/payload/payload.ts b/bindings/nodejs/lib/types/block/payload/payload.ts
index 82e85c9c37..f498600e47 100644
--- a/bindings/nodejs/lib/types/block/payload/payload.ts
+++ b/bindings/nodejs/lib/types/block/payload/payload.ts
@@ -16,7 +16,7 @@ enum PayloadType {
 }
 
 abstract class Payload {
-    private type: PayloadType;
+    readonly type: PayloadType;
 
     constructor(type: PayloadType) {
         this.type = type;
diff --git a/bindings/nodejs/lib/types/block/payload/transaction/essence.ts b/bindings/nodejs/lib/types/block/payload/transaction/essence.ts
index 297b8e6327..66fe8b00d2 100644
--- a/bindings/nodejs/lib/types/block/payload/transaction/essence.ts
+++ b/bindings/nodejs/lib/types/block/payload/transaction/essence.ts
@@ -16,7 +16,7 @@ enum TransactionEssenceType {
 }
 
 abstract class TransactionEssence {
-    private type: TransactionEssenceType;
+    readonly type: TransactionEssenceType;
 
     constructor(type: TransactionEssenceType) {
         this.type = type;
diff --git a/bindings/nodejs/lib/types/block/payload/transaction/unlock.ts b/bindings/nodejs/lib/types/block/payload/transaction/unlock.ts
index 0bfefd6a54..45b7f0f2ce 100644
--- a/bindings/nodejs/lib/types/block/payload/transaction/unlock.ts
+++ b/bindings/nodejs/lib/types/block/payload/transaction/unlock.ts
@@ -15,7 +15,7 @@ enum UnlockType {
 }
 
 abstract class Unlock {
-    private type: UnlockType;
+    readonly type: UnlockType;
 
     constructor(type: UnlockType) {
         this.type = type;
diff --git a/bindings/nodejs/lib/types/block/signature.ts b/bindings/nodejs/lib/types/block/signature.ts
index 9f7ec48d6a..bf7c811eaa 100644
--- a/bindings/nodejs/lib/types/block/signature.ts
+++ b/bindings/nodejs/lib/types/block/signature.ts
@@ -12,7 +12,7 @@ enum SignatureType {
 }
 
 abstract class Signature {
-    private type: SignatureType;
+    readonly type: SignatureType;
 
     constructor(type: SignatureType) {
         this.type = type;
diff --git a/bindings/nodejs/lib/types/models/milestone_options/milestone-options.ts b/bindings/nodejs/lib/types/models/milestone_options/milestone-options.ts
index d186737b4f..b094b12683 100644
--- a/bindings/nodejs/lib/types/models/milestone_options/milestone-options.ts
+++ b/bindings/nodejs/lib/types/models/milestone_options/milestone-options.ts
@@ -10,7 +10,7 @@ enum MilestoneOptionType {
 }
 
 abstract class MilestoneOption {
-    private type: MilestoneOptionType;
+    readonly type: MilestoneOptionType;
 
     constructor(type: MilestoneOptionType) {
         this.type = type;
diff --git a/bindings/nodejs/lib/types/wallet/prepared-create-token-transaction.ts b/bindings/nodejs/lib/types/wallet/prepared-create-token-transaction.ts
index 30ecb6623d..1eace7d6ff 100644
--- a/bindings/nodejs/lib/types/wallet/prepared-create-token-transaction.ts
+++ b/bindings/nodejs/lib/types/wallet/prepared-create-token-transaction.ts
@@ -9,7 +9,7 @@ import { PreparedTransaction } from './prepared-transaction';
  * The class PreparedCreateNativeTokenTransaction represents prepared data for issuing a transaction to create a native token.
  */
 export class PreparedCreateNativeTokenTransaction extends PreparedTransaction {
-    private _tokenId: string;
+    readonly _tokenId: string;
 
     constructor(
         preparedData: PreparedCreateNativeTokenTransactionData,
diff --git a/bindings/nodejs/lib/types/wallet/prepared-transaction.ts b/bindings/nodejs/lib/types/wallet/prepared-transaction.ts
index 00e5edacba..042b6ed75e 100644
--- a/bindings/nodejs/lib/types/wallet/prepared-transaction.ts
+++ b/bindings/nodejs/lib/types/wallet/prepared-transaction.ts
@@ -15,8 +15,8 @@ import {
  * the transaction and sign+submit/send the transaction.
  */
 export class PreparedTransaction {
-    private _preparedData: PreparedTransactionData;
-    private _account: Account;
+    readonly _preparedData: PreparedTransactionData;
+    readonly _account: Account;
 
     constructor(preparedData: PreparedTransactionData, account: Account) {
         this._preparedData = preparedData;