diff --git a/.eslintrc.js b/.eslintrc.js
index d8f683df7..a48eb530e 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -29,6 +29,7 @@ module.exports = {
         "@typescript-eslint/no-unused-vars": "off", // or "@typescript-eslint/no-unused-vars": "off",
         "no-use-before-define": "off",
         "@typescript-eslint/no-use-before-define": ["error"],
+        "@typescript-eslint/prefer-nullish-coalescing": "error",
         "unused-imports/no-unused-imports": "error",
         "unused-imports/no-unused-vars": [
             "warn",
diff --git a/packages/binding-http/src/codecs/tuya-codec.ts b/packages/binding-http/src/codecs/tuya-codec.ts
index 82d4eaedd..d6165cd45 100644
--- a/packages/binding-http/src/codecs/tuya-codec.ts
+++ b/packages/binding-http/src/codecs/tuya-codec.ts
@@ -35,7 +35,7 @@ export default class HttpTuyaCodec implements ContentCodec {
         const success = parsedBody.success ?? false;
 
         if (!success) {
-            throw new Error(parsedBody.msg != null ? parsedBody.msg : JSON.stringify(parsedBody));
+            throw new Error(parsedBody.msg ?? JSON.stringify(parsedBody));
         }
 
         for (const value of Object.values(parsedBody.result ?? {})) {
diff --git a/packages/binding-mbus/src/mbus-client.ts b/packages/binding-mbus/src/mbus-client.ts
index f5f66ca80..64e180418 100644
--- a/packages/binding-mbus/src/mbus-client.ts
+++ b/packages/binding-mbus/src/mbus-client.ts
@@ -94,7 +94,7 @@ export default class MBusClient implements ProtocolClient {
             debug(`Creating new MbusConnection for ${hostAndPort}`);
             this._connections.set(
                 hostAndPort,
-                new MBusConnection(host, port, { connectionTimeout: form["mbus:timeout"] || DEFAULT_TIMEOUT })
+                new MBusConnection(host, port, { connectionTimeout: form["mbus:timeout"] ?? DEFAULT_TIMEOUT })
             );
             connection = this._connections.get(hostAndPort);
             if (!connection) {
diff --git a/packages/binding-modbus/src/modbus-client.ts b/packages/binding-modbus/src/modbus-client.ts
index c191ad661..86dfa0b98 100644
--- a/packages/binding-modbus/src/modbus-client.ts
+++ b/packages/binding-modbus/src/modbus-client.ts
@@ -171,7 +171,7 @@ export default class ModbusClient implements ProtocolClient {
             debug(`Creating new ModbusConnection for ${hostAndPort}`);
 
             connection = new ModbusConnection(host, port, {
-                connectionTimeout: form["modbus:timeout"] || DEFAULT_TIMEOUT,
+                connectionTimeout: form["modbus:timeout"] ?? DEFAULT_TIMEOUT,
             });
             this._connections.set(hostAndPort, connection);
         } else {
diff --git a/packages/binding-netconf/src/netconf-client.ts b/packages/binding-netconf/src/netconf-client.ts
index 67f1550a4..6690fbfeb 100644
--- a/packages/binding-netconf/src/netconf-client.ts
+++ b/packages/binding-netconf/src/netconf-client.ts
@@ -83,8 +83,8 @@ export default class NetconfClient implements ProtocolClient {
         const port = parseInt(url.port);
         const xpathQuery = url.pathname;
         const method = this.methodFromForm(form, "EDIT-CONFIG");
-        let NSs = form["nc:NSs"] || {};
-        const target = form["nc:target"] || DEFAULT_TARGET;
+        let NSs = form["nc:NSs"] ?? {};
+        const target = form["nc:target"] ?? DEFAULT_TARGET;
 
         if (this.client.getRouter() === null) {
             try {
@@ -112,8 +112,8 @@ export default class NetconfClient implements ProtocolClient {
         const port = parseInt(url.port);
         const xpathQuery = url.pathname;
         const method = this.methodFromForm(form, "RPC");
-        let NSs = form["nc:NSs"] || {};
-        const target = form["nc:target"] || DEFAULT_TARGET;
+        let NSs = form["nc:NSs"] ?? {};
+        const target = form["nc:target"] ?? DEFAULT_TARGET;
         let result: string;
 
         if (this.client.getRouter() === null) {
diff --git a/packages/binding-opcua/src/opcua-protocol-client.ts b/packages/binding-opcua/src/opcua-protocol-client.ts
index 2b33a57d3..603c84a5f 100644
--- a/packages/binding-opcua/src/opcua-protocol-client.ts
+++ b/packages/binding-opcua/src/opcua-protocol-client.ts
@@ -121,7 +121,7 @@ export function findBasicDataTypeC(
                 return callback(new Error("Internal Error"));
             }
 
-            browseResult.references = browseResult.references || /* istanbul ignore next */ [];
+            browseResult.references = browseResult.references ?? /* istanbul ignore next */ [];
             const baseDataType = browseResult.references[0].nodeId;
             return findBasicDataTypeC(session, baseDataType, callback);
         });
@@ -335,7 +335,7 @@ export class OPCUAProtocolClient implements ProtocolClient {
                 session,
                 form,
                 argumentDefinition,
-                callResult.outputArguments || []
+                callResult.outputArguments ?? []
             );
             return output;
         });
@@ -571,7 +571,7 @@ export class OPCUAProtocolClient implements ProtocolClient {
 
             const { name, dataType, /* description, */ arrayDimensions, valueRank } = argument;
 
-            if (bodyInput[name || "null"] === undefined) {
+            if (bodyInput[name ?? "null"] === undefined) {
                 throw new Error("missing value in bodyInput for argument " + name);
             }
             const basicDataType = await this._findBasicDataType(session, dataType);
@@ -587,7 +587,7 @@ export class OPCUAProtocolClient implements ProtocolClient {
                     : VariantArrayType.Matrix;
 
             const n = (a: unknown) => Buffer.from(JSON.stringify(a));
-            const v = await this._contentToVariant(content2.type, n(bodyInput[name || "null"]), basicDataType);
+            const v = await this._contentToVariant(content2.type, n(bodyInput[name ?? "null"]), basicDataType);
 
             variants.push({
                 dataType: basicDataType,
@@ -607,14 +607,14 @@ export class OPCUAProtocolClient implements ProtocolClient {
     ): Promise<Content> {
         const outputArguments = (argumentDefinition.outputArguments || []) as unknown as Argument[];
 
-        const contentType = form.contentType || "application/json";
+        const contentType = form.contentType ?? "application/json";
 
         const body: Record<string, unknown> = {};
         for (let index = 0; index < outputArguments.length; index++) {
             const argument = outputArguments[index];
             const { name } = argument;
             const element = _variantToJSON(outputVariants[index], contentType);
-            body[name || "null"] = element;
+            body[name ?? "null"] = element;
         }
 
         return new Content("application/json", Readable.from(JSON.stringify(body)));
diff --git a/packages/core/src/codecs/text-codec.ts b/packages/core/src/codecs/text-codec.ts
index e4f9061de..0fa133a4c 100644
--- a/packages/core/src/codecs/text-codec.ts
+++ b/packages/core/src/codecs/text-codec.ts
@@ -23,7 +23,7 @@ export default class TextCodec implements ContentCodec {
     private subMediaType: string;
 
     constructor(subMediaType?: string) {
-        this.subMediaType = subMediaType == null ? "text/plain" : subMediaType;
+        this.subMediaType = subMediaType ?? "text/plain";
     }
 
     getMediaType(): string {
diff --git a/packages/td-tools/src/thing-model-helpers.ts b/packages/td-tools/src/thing-model-helpers.ts
index 552ee799e..82d307ccb 100644
--- a/packages/td-tools/src/thing-model-helpers.ts
+++ b/packages/td-tools/src/thing-model-helpers.ts
@@ -613,7 +613,7 @@ export class ThingModelHelpers {
         const regex = "{{.*?}}";
         const modelString = JSON.stringify(model);
         // first check if model needs map
-        let keys: string[] = modelString.match(new RegExp(regex, "g")) || [];
+        let keys: string[] = modelString.match(new RegExp(regex, "g")) ?? [];
         keys = keys.map((el) => el.replace("{{", "").replace("}}", ""));
         let isValid = true;
         let errors;