diff --git a/.gitignore b/.gitignore
index b21036c4..fff0713e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,4 +7,6 @@ dist
 /coverage
 .coveralls.yml
 .nyc_output
-secrets.zip
\ No newline at end of file
+secrets.zip
+jest
+junk
\ No newline at end of file
diff --git a/README.md b/README.md
index 49f8e9fc..3b14daef 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,7 @@ new OpenApiValidator({
 ```javascript
 app.use((err, req, res, next) => {
   // format error
-  res.status(err.status || 500).json({
+  res.status(err.status ?? 500).json({
     message: err.message,
     errors: err.errors,
   });
@@ -138,7 +138,7 @@ app.post('/v1/pets/:id/photos', function(req, res, next) {
 // 6. Create an Express error handler
 app.use((err, req, res, next) => {
   // 7. Customize errors
-  res.status(err.status || 500).json({
+  res.status(err.status ?? 500).json({
     message: err.message,
     errors: err.errors,
   });
diff --git a/package-lock.json b/package-lock.json
index 81c1fd3f..51cd7f4a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5187,9 +5187,9 @@
       "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c="
     },
     "typescript": {
-      "version": "3.6.4",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.6.4.tgz",
-      "integrity": "sha512-unoCll1+l+YK4i4F8f22TaNVPRHcD9PA3yCuZ8g5e0qGqlVlJ/8FSateOLLSagn+Yg5+ZwuPkL8LFUc0Jcvksg==",
+      "version": "3.7.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.7.2.tgz",
+      "integrity": "sha512-ml7V7JfiN2Xwvcer+XAf2csGO1bPBdRbFCkYBczNZggrBZ9c7G3riSUeJmqEU5uOtXNPMhE3n+R4FA/3YOAWOQ==",
       "dev": true
     },
     "uglify-js": {
diff --git a/package.json b/package.json
index 245cd622..faf55090 100644
--- a/package.json
+++ b/package.json
@@ -58,6 +58,6 @@
     "supertest": "^4.0.2",
     "ts-node": "^8.3.0",
     "tsc": "^1.20150623.0",
-    "typescript": "^3.6.4"
+    "typescript": "^3.7.2"
   }
 }
diff --git a/src/framework/base.path.ts b/src/framework/base.path.ts
index fd26972d..ebc16dba 100644
--- a/src/framework/base.path.ts
+++ b/src/framework/base.path.ts
@@ -26,7 +26,7 @@ export default class BasePath {
     for (const variable in server.variables) {
       if (server.variables.hasOwnProperty(variable)) {
         const v = server.variables[variable];
-        const enums = v.enum || [];
+        const enums = v.enum ?? [];
         if (enums.length === 0 && v.default) enums.push(v.default);
 
         this.variables[variable] = {
diff --git a/src/framework/index.ts b/src/framework/index.ts
index 4d644903..33567982 100644
--- a/src/framework/index.ts
+++ b/src/framework/index.ts
@@ -60,7 +60,7 @@ export default class OpenAPIFramework implements IOpenAPIFramework {
       ? getBasePathsFromServers(this.apiDoc.servers)
       : [
           new BasePath({
-            url: (this.apiDoc.basePath || '').replace(/\/$/, ''),
+            url: (this.apiDoc.basePath ?? '').replace(/\/$/, ''),
           }),
         ];
 
diff --git a/src/framework/openapi.schema.validator.ts b/src/framework/openapi.schema.validator.ts
index 8817b880..7353fa71 100644
--- a/src/framework/openapi.schema.validator.ts
+++ b/src/framework/openapi.schema.validator.ts
@@ -14,7 +14,7 @@ export class OpenAPISchemaValidator {
     if (!ver) throw Error('version missing from OpenAPI specification');
     if (ver != 3) throw Error('OpenAPI v3 specification version is required');
 
-    const schema = merge({}, openapi3Schema, extensions || {});
+    const schema = merge({}, openapi3Schema, extensions ?? {});
     v.addSchema(schema);
     this.validator = v.compile(schema);
   }
diff --git a/src/framework/openapi.spec.loader.ts b/src/framework/openapi.spec.loader.ts
index 0e2d2741..842898fd 100644
--- a/src/framework/openapi.spec.loader.ts
+++ b/src/framework/openapi.spec.loader.ts
@@ -13,8 +13,8 @@ export class OpenApiSpecLoader {
 
   load() {
     const framework = this.createFramework(this.opts);
-    const apiDoc = framework.apiDoc || {};
-    const bps = framework.basePaths || [];
+    const apiDoc = framework.apiDoc ?? {};
+    const bps = framework.basePaths ?? [];
     const basePaths = bps.reduce((acc, bp) => {
       bp.all().forEach(path => acc.add(path));
       return acc;
@@ -52,10 +52,10 @@ export class OpenApiSpecLoader {
                 continue;
               }
               const schemaParameters = new Set();
-              (schema.parameters || []).forEach(parameter =>
+              (schema.parameters ?? []).forEach(parameter =>
                 schemaParameters.add(parameter),
               );
-              ((methods as any).parameters || []).forEach(parameter =>
+              ((methods as any).parameters ?? []).forEach(parameter =>
                 schemaParameters.add(parameter),
               );
               schema.parameters = Array.from(schemaParameters);
diff --git a/src/index.ts b/src/index.ts
index 0365b6a2..141526ca 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -42,7 +42,7 @@ export class OpenApiValidator {
     this.installMultipartMiddleware();
 
     const components = this.context.apiDoc.components;
-    if (components && components.securitySchemes) {
+    if (components?.securitySchemes) {
       this.installSecurityMiddleware();
     }
 
@@ -76,7 +76,7 @@ export class OpenApiValidator {
         ) => {
           if (req.openapi.pathParams) {
             // override path params
-            req.params[name] = req.openapi.pathParams[name] || req.params[name];
+            req.params[name] = req.openapi.pathParams[name] ?? req.params[name];
           }
           next();
         },
diff --git a/src/middlewares/openapi.multipart.ts b/src/middlewares/openapi.multipart.ts
index a68a5fe8..92ed2bb6 100644
--- a/src/middlewares/openapi.multipart.ts
+++ b/src/middlewares/openapi.multipart.ts
@@ -50,13 +50,7 @@ function isValidContentType(req: Request): boolean {
 }
 
 function isMultipart(req: OpenApiRequest): boolean {
-  return (
-    req.openapi &&
-    req.openapi.schema &&
-    req.openapi.schema.requestBody &&
-    req.openapi.schema.requestBody.content &&
-    req.openapi.schema.requestBody.content['multipart/form-data']
-  );
+  return req?.openapi?.schema?.requestBody?.content?.['multipart/form-data'];
 }
 
 function error(req: OpenApiRequest, err: Error) {
@@ -67,7 +61,7 @@ function error(req: OpenApiRequest, err: Error) {
     // HACK
     // TODO improve multer error handling
     const missingField = /Multipart: Boundary not found/i.test(
-      err.message || '',
+      err.message ?? '',
     );
     if (missingField) {
       return validationError(400, req.path, 'multipart file(s) required');
diff --git a/src/middlewares/openapi.request.validator.ts b/src/middlewares/openapi.request.validator.ts
index 376ecf5e..cc650273 100644
--- a/src/middlewares/openapi.request.validator.ts
+++ b/src/middlewares/openapi.request.validator.ts
@@ -49,7 +49,7 @@ export class RequestValidator {
 
     // cache middleware by combining method, path, and contentType
     // TODO contentType could have value not_provided
-    const contentType = extractContentType(req) || 'not_provided';
+    const contentType = extractContentType(req) ?? 'not_provided';
     const key = `${req.method}-${req.path}-${contentType}`;
 
     if (!this._middlewareCache[key]) {
@@ -71,13 +71,13 @@ export class RequestValidator {
 
     let requestBody = pathSchema.requestBody;
 
-    if (requestBody && requestBody.hasOwnProperty('$ref')) {
+    if (requestBody?.hasOwnProperty('$ref')) {
       const id = requestBody.$ref.replace(/^.+\//i, '');
       requestBody = this._apiDocs.components.requestBodies[id];
     }
 
     let body = this.requestBodyToSchema(path, contentType, requestBody);
-    let requiredAdds = requestBody && requestBody.required ? ['body'] : [];
+    let requiredAdds = requestBody?.required ? ['body'] : [];
 
     const schema = {
       // $schema: "http://json-schema.org/draft-04/schema#",
@@ -100,7 +100,7 @@ export class RequestValidator {
         Object.keys(req.openapi.pathParams).length > 0;
 
       if (shouldUpdatePathParams) {
-        req.params = req.openapi.pathParams || req.params;
+        req.params = req.openapi.pathParams ?? req.params;
       }
 
       req.schema = schema;
@@ -111,7 +111,7 @@ export class RequestValidator {
        * https://swagger.io/docs/specification/describing-parameters/#schema-vs-content
        */
       parameters.parseJson.forEach(item => {
-        if (req[item.reqField] && req[item.reqField][item.name]) {
+        if (req[item.reqField]?.[item.name]) {
           req[item.reqField][item.name] = JSON.parse(
             req[item.reqField][item.name],
           );
@@ -125,7 +125,7 @@ export class RequestValidator {
        * filter=foo%20bar%20baz
        */
       parameters.parseArray.forEach(item => {
-        if (req[item.reqField] && req[item.reqField][item.name]) {
+        if (req[item.reqField]?.[item.name]) {
           req[item.reqField][item.name] = req[item.reqField][item.name].split(
             item.delimiter,
           );
@@ -137,8 +137,7 @@ export class RequestValidator {
        */
       parameters.parseArrayExplode.forEach(item => {
         if (
-          req[item.reqField] &&
-          req[item.reqField][item.name] &&
+          req[item.reqField]?.[item.name] &&
           !(req[item.reqField][item.name] instanceof Array)
         ) {
           req[item.reqField][item.name] = [req[item.reqField][item.name]];
@@ -156,7 +155,7 @@ export class RequestValidator {
         next();
       } else {
         // TODO look into Ajv async errors plugins
-        const errors = augmentAjvErrors([...(validator.errors || [])]);
+        const errors = augmentAjvErrors([...(validator.errors ?? [])]);
         const err = ajvErrorsToValidatorError(400, errors);
         const message = this.ajv.errorsText(errors, { dataVar: 'request' });
         throw ono(err, message);
@@ -190,7 +189,7 @@ export class RequestValidator {
             : `unsupported media type ${contentType}`;
         throw validationError(415, path, msg);
       }
-      return content.schema || {};
+      return content.schema ?? {};
     }
     return {};
   }
@@ -203,7 +202,7 @@ export class RequestValidator {
             const securityKey = Object.keys(sec)[0];
             return securitySchema[securityKey];
           })
-          .filter(sec => sec && sec.in && sec.in === 'query')
+          .filter(sec => sec?.in === 'query')
           .map(sec => sec.name)
       : [];
   }
@@ -242,7 +241,7 @@ export class RequestValidator {
       }
 
       let parameterSchema = parameter.schema;
-      if (parameter.content && parameter.content[TYPE_JSON]) {
+      if (parameter.content?.[TYPE_JSON]) {
         parameterSchema = parameter.content[TYPE_JSON].schema;
         parseJson.push({ name, reqField });
       }
@@ -252,11 +251,7 @@ export class RequestValidator {
         throw validationError(400, path, message);
       }
 
-      if (
-        parameter.schema &&
-        parameter.schema.type === 'array' &&
-        !parameter.explode
-      ) {
+      if (parameter.schema?.type === 'array' && !parameter.explode) {
         const delimiter = arrayDelimiter[parameter.style];
         if (!delimiter) {
           const message = `Parameter 'style' has incorrect value '${parameter.style}' for [${parameter.name}]`;
@@ -265,11 +260,7 @@ export class RequestValidator {
         parseArray.push({ name, reqField, delimiter });
       }
 
-      if (
-        parameter.schema &&
-        parameter.schema.type === 'array' &&
-        parameter.explode
-      ) {
+      if (parameter.schema?.type === 'array' && parameter.explode) {
         parseArrayExplode.push({ name, reqField });
       }
 
diff --git a/src/middlewares/openapi.response.validator.ts b/src/middlewares/openapi.response.validator.ts
index 7ad6cc63..2d48c146 100644
--- a/src/middlewares/openapi.response.validator.ts
+++ b/src/middlewares/openapi.response.validator.ts
@@ -28,7 +28,7 @@ export class ResponseValidator {
   public validate() {
     return mung.json((body, req: any, res) => {
       if (req.openapi) {
-        const responses = req.openapi.schema && req.openapi.schema.responses;
+        const responses = req.openapi.schema?.responses;
         const validators = this._getOrBuildValidator(req, responses);
         const statusCode = res.statusCode;
         const path = req.path;
@@ -45,7 +45,7 @@ export class ResponseValidator {
       return this.buildValidators(responses);
     }
 
-    const contentType = extractContentType(req) || 'not_provided';
+    const contentType = extractContentType(req) ?? 'not_provided';
     const key = `${req.method}-${req.path}-${contentType}`;
 
     let validators = this.validatorsCache[key];
@@ -100,10 +100,7 @@ export class ResponseValidator {
    * @returns a map of validators
    */
   private buildValidators(responses) {
-    const canValidate = r =>
-      typeof r.content === 'object' &&
-      r.content[TYPE_JSON] &&
-      r.content[TYPE_JSON].schema;
+    const canValidate = r => typeof r.content === 'object' && r.content[TYPE_JSON]?.schema;
 
     const schemas = {};
     for (const entry of <any[]>Object.entries(responses)) {
@@ -122,7 +119,7 @@ export class ResponseValidator {
         properties: {
           response: schema,
         },
-        components: this.spec.components || {},
+        components: this.spec.components ?? {},
       };
     }
 
diff --git a/src/middlewares/openapi.security.ts b/src/middlewares/openapi.security.ts
index 1613beb3..ea9f5783 100644
--- a/src/middlewares/openapi.security.ts
+++ b/src/middlewares/openapi.security.ts
@@ -46,7 +46,7 @@ export function security(
 
     // use the local security object or fallbac to api doc's security or undefined
     const securities: OpenAPIV3.SecurityRequirementObject[] =
-      req.openapi.schema.security || context.apiDoc.security;
+      req.openapi.schema.security ?? context.apiDoc.security;
 
     const path: string = req.openapi.openApiRoute;
 
@@ -84,7 +84,7 @@ export function security(
       if (success) next();
       else throw firstError;
     } catch (e) {
-      const message = (e && e.error && e.error.message) || 'unauthorized';
+      const message = e?.error?.message || 'unauthorized';
       const err = validationError(e.status, path, message);
       next(err);
     }
@@ -117,9 +117,7 @@ class SecuritySchemes {
         }
         const securityKey = Object.keys(s)[0];
         const scheme: any = this.securitySchemes[securityKey];
-        const handler =
-          (this.securityHandlers && this.securityHandlers[securityKey]) ||
-          fallbackHandler;
+        const handler = this.securityHandlers?.[securityKey] ?? fallbackHandler;
         const scopesTmp = s[securityKey];
         const scopes = Array.isArray(scopesTmp) ? scopesTmp : [];
 
@@ -154,7 +152,7 @@ class SecuritySchemes {
       } catch (e) {
         return {
           success: false,
-          status: e.status || 401,
+          status: e.status ?? 401,
           error: e,
         };
       }
diff --git a/src/middlewares/util.ts b/src/middlewares/util.ts
index d5193e8d..b5d54b78 100644
--- a/src/middlewares/util.ts
+++ b/src/middlewares/util.ts
@@ -27,7 +27,7 @@ const _validationError = (
     {
       path,
       message,
-      ...({ errors } || {}),
+      ...({ errors } ?? {}),
     },
   ],
 });
@@ -52,7 +52,7 @@ export function augmentAjvErrors(
   errors.forEach(e => {
     if (e.keyword === 'enum') {
       const params: any = e.params;
-      const allowedEnumValues = params && params.allowedValues;
+      const allowedEnumValues = params?.allowedValues;
       e.message = !!allowedEnumValues
         ? `${e.message}: ${allowedEnumValues.join(', ')}`
         : e.message;
@@ -68,15 +68,9 @@ export function ajvErrorsToValidatorError(
     status,
     errors: errors.map(e => {
       const params: any = e.params;
-      const required =
-        params &&
-        params.missingProperty &&
-        e.dataPath + '.' + params.missingProperty;
-      const additionalProperty =
-        params &&
-        params.additionalProperty &&
-        e.dataPath + '.' + params.additionalProperty;
-      const path = required || additionalProperty || e.dataPath || e.schemaPath;
+      const required = params?.missingProperty && e.dataPath + '.' + params.missingProperty;
+      const additionalProperty = params?.additionalProperty && e.dataPath + '.' + params.additionalProperty;
+      const path = required ?? additionalProperty ?? e.dataPath ?? e.schemaPath;
       return {
         path,
         message: e.message,
diff --git a/test/common/app.ts b/test/common/app.ts
index 203ff02e..03701584 100644
--- a/test/common/app.ts
+++ b/test/common/app.ts
@@ -37,7 +37,7 @@ export async function createApp(
   if (useRoutes) {
     // Register error handler
     app.use((err, req, res, next) => {
-      res.status(err.status || 500).json({
+      res.status(err.status ?? 500).json({
         message: err.message,
         errors: err.errors,
       });
diff --git a/test/one.of.spec.ts b/test/one.of.spec.ts
index 6a019c4a..367d796a 100644
--- a/test/one.of.spec.ts
+++ b/test/one.of.spec.ts
@@ -22,9 +22,9 @@ describe(packageJson.name, () => {
           res.json(req.body);
         });
         app.use((err, req, res, next) => {
-          res.status(err.status || 500).json({
+          res.status(err.status ?? 500).json({
             message: err.message,
-            code: err.status || 500,
+            code: err.status ?? 500,
           });
         });
       },
diff --git a/test/read.only.spec.ts b/test/read.only.spec.ts
index 5bd76537..54ba3ec0 100644
--- a/test/read.only.spec.ts
+++ b/test/read.only.spec.ts
@@ -34,7 +34,7 @@ describe(packageJson.name, () => {
           body.created_at = new Date().toISOString();
           body.reviews = body.reviews.map(r => ({
             id: 99,
-            rating: r.rating || 2,
+            rating: r.rating ?? 2,
           }));
           res.json(body);
         }),
diff --git a/test/response.validation.options.spec.ts b/test/response.validation.options.spec.ts
index f06d52a6..bd621129 100644
--- a/test/response.validation.options.spec.ts
+++ b/test/response.validation.options.spec.ts
@@ -36,9 +36,9 @@ describe(packageJson.name, () => {
           res.json(req.body);
         });
         app.use((err, req, res, next) => {
-          res.status(err.status || 500).json({
+          res.status(err.status ?? 500).json({
             message: err.message,
-            code: err.status || 500,
+            code: err.status ?? 500,
           });
         });
       },
diff --git a/test/response.validation.spec.ts b/test/response.validation.spec.ts
index 0852da44..28dc7822 100644
--- a/test/response.validation.spec.ts
+++ b/test/response.validation.spec.ts
@@ -40,9 +40,9 @@ describe(packageJson.name, () => {
           res.json(req.body);
         });
         app.use((err, req, res, next) => {
-          res.status(err.status || 500).json({
+          res.status(err.status ?? 500).json({
             message: err.message,
-            code: err.status || 500,
+            code: err.status ?? 500,
           });
         });
       },
diff --git a/test/write.only.spec.ts b/test/write.only.spec.ts
index 9f152257..c8618d8f 100644
--- a/test/write.only.spec.ts
+++ b/test/write.only.spec.ts
@@ -29,7 +29,7 @@ describe(packageJson.name, () => {
           body.created_at = new Date().toISOString();
           body.reviews = body.reviews.map(r => ({
             ...(excludeWriteOnly ? {} : { role_x: 'admin' }),
-            rating: r.rating || 2,
+            rating: r.rating ?? 2,
           }));
 
           if (excludeWriteOnly) {