diff --git a/modules/openapi-generator/src/main/resources/rust/reqwest-trait/api.mustache b/modules/openapi-generator/src/main/resources/rust/reqwest-trait/api.mustache
index 7ab6fbdeede..e54ac68e968 100644
--- a/modules/openapi-generator/src/main/resources/rust/reqwest-trait/api.mustache
+++ b/modules/openapi-generator/src/main/resources/rust/reqwest-trait/api.mustache
@@ -192,36 +192,66 @@ impl {{classname}} for {{classname}}Client {
         {{/isNullable}}
         {{#isNullable}}
         {{#isDeepObject}}
-        if let Some(ref local_var_str) = {{{paramName}}} {
-            let params = crate::apis::parse_deep_object("{{{baseName}}}", local_var_str);
+        {{^isExplode}}
+        if let Some(ref param_value) = {{{paramName}}} {
+            let params = crate::apis::parse_deep_object("{{{baseName}}}", &serde_json::to_value(param_value)?);
             local_var_req_builder = local_var_req_builder.query(&params);
-        };
+        }
+        {{/isExplode}}
+        {{#isExplode}}
+        {{#isModel}}
+        if let Some(ref param_value) = {{{paramName}}} {
+            local_var_req_builder = local_var_req_builder.query(&param_value);
+        }
+        {{/isModel}}
+        {{#isMap}}
+        if let Some(ref param_value) = {{{paramName}}} {
+            let mut query_params = Vec::with_capacity(param_value.len());
+            for (key, value) in param_value.iter() {
+                query_params.push((key.to_string(), serde_json::to_string(value)?));
+            }
+            local_var_req_builder = local_var_req_builder.query(&query_params);
+        }
+        {{/isMap}}
+        {{/isExplode}}
         {{/isDeepObject}}
         {{^isDeepObject}}
-        if let Some(ref local_var_str) = {{{paramName}}} {
-            local_var_req_builder = local_var_req_builder.query(&[("{{{baseName}}}", &local_var_str.to_string())]);
+        if let Some(ref param_value) = {{{paramName}}} {
+            local_var_req_builder = local_var_req_builder.query(&[("{{{baseName}}}", &param_value.to_string())]);
         };
         {{/isDeepObject}}
         {{/isNullable}}
         {{/isArray}}
         {{/required}}
         {{^required}}
-        if let Some(ref local_var_str) = {{{paramName}}} {
+        if let Some(ref param_value) = {{{paramName}}} {
             {{#isArray}}
             local_var_req_builder = match "{{collectionFormat}}" {
-                "multi" => local_var_req_builder.query(&local_var_str.into_iter().map(|p| ("{{{baseName}}}".to_owned(), p.to_string())).collect::<Vec<(std::string::String, std::string::String)>>()),
-                _ => local_var_req_builder.query(&[("{{{baseName}}}", &local_var_str.into_iter().map(|p| p.to_string()).collect::<Vec<String>>().join(",").to_string())]),
+                "multi" => local_var_req_builder.query(&param_value.into_iter().map(|p| ("{{{baseName}}}".to_owned(), p.to_string())).collect::<Vec<(std::string::String, std::string::String)>>()),
+                _ => local_var_req_builder.query(&[("{{{baseName}}}", &param_value.into_iter().map(|p| p.to_string()).collect::<Vec<String>>().join(",").to_string())]),
             };
             {{/isArray}}
-            {{^isArray}}
             {{#isDeepObject}}
-            let params = crate::apis::parse_deep_object("{{{baseName}}}", local_var_str);
+            {{^isExplode}}
+            let params = crate::apis::parse_deep_object("{{{baseName}}}", &serde_json::to_value(param_value)?);
             local_var_req_builder = local_var_req_builder.query(&params);
+            {{/isExplode}}
+            {{#isExplode}}
+            {{#isModel}}
+            local_var_req_builder = local_var_req_builder.query(&param_value);
+            {{/isModel}}
+            {{#isMap}}
+            let mut query_params = Vec::with_capacity(param_value.len());
+            for (key, value) in param_value.iter() {
+                query_params.push((key.to_string(), serde_json::to_string(value)?));
+            }
+            local_var_req_builder = local_var_req_builder.query(&query_params);
+            {{/isMap}}
+            {{/isExplode}}
             {{/isDeepObject}}
             {{^isDeepObject}}
-            local_var_req_builder = local_var_req_builder.query(&[("{{{baseName}}}", &local_var_str.to_string())]);
+            local_var_req_builder = local_var_req_builder.query(&[("{{{baseName}}}", &param_value.to_string())]);
             {{/isDeepObject}}
-            {{/isArray}}
         }
         {{/required}}
         {{/queryParams}}
diff --git a/modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache b/modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache
index e9cfabc5599..9c73fc5c39d 100644
--- a/modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache
+++ b/modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache
@@ -160,8 +160,22 @@ pub {{#supportAsync}}async {{/supportAsync}}fn {{{operationId}}}(configuration:
     {{#isNullable}}
     {{#isDeepObject}}
     if let Some(ref param_value) = {{{vendorExtensions.x-rust-param-identifier}}} {
-        let params = crate::apis::parse_deep_object("{{{baseName}}}", param_value);
+        {{^isExplode}}
+        let params = crate::apis::parse_deep_object("{{{baseName}}}", &serde_json::to_value(param_value)?);
         req_builder = req_builder.query(&params);
+        {{/isExplode}}
+        {{#isExplode}}
+        {{#isModel}}
+        req_builder = req_builder.query(&param_value);
+        {{/isModel}}
+        {{#isMap}}
+        let mut query_params = Vec::with_capacity(param_value.len());
+        for (key, value) in param_value.iter() {
+            query_params.push((key.to_string(), serde_json::to_string(value)?));
+        }
+        req_builder = req_builder.query(&query_params);
+        {{/isMap}}
+        {{/isExplode}}
     };
     {{/isDeepObject}}
     {{^isDeepObject}}
@@ -182,8 +196,22 @@ pub {{#supportAsync}}async {{/supportAsync}}fn {{{operationId}}}(configuration:
         {{/isArray}}
         {{^isArray}}
         {{#isDeepObject}}
-        let params = crate::apis::parse_deep_object("{{{baseName}}}", param_value);
+        {{^isExplode}}
+        let params = crate::apis::parse_deep_object("{{{baseName}}}", &serde_json::to_value(param_value)?);
         req_builder = req_builder.query(&params);
+        {{/isExplode}}
+        {{#isExplode}}
+        {{#isModel}}
+        req_builder = req_builder.query(&param_value);
+        {{/isModel}}
+        {{#isMap}}
+        let mut query_params = Vec::with_capacity(param_value.len());
+        for (key, value) in param_value.iter() {
+            query_params.push((key.to_string(), serde_json::to_string(value)?));
+        }
+        req_builder = req_builder.query(&query_params);
+        {{/isMap}}
+        {{/isExplode}}
         {{/isDeepObject}}
         {{^isDeepObject}}
         req_builder = req_builder.query(&[("{{{baseName}}}", &param_value.to_string())]);