diff --git a/src/commands/from_ini.rs b/src/commands/from_ini.rs
index 7352d4c0db..340ad26e4f 100644
--- a/src/commands/from_ini.rs
+++ b/src/commands/from_ini.rs
@@ -1,4 +1,4 @@
-use crate::object::{Dictionary, Primitive, SpannedDictBuilder, Value};
+use crate::object::{Primitive, SpannedDictBuilder, Value};
 use crate::prelude::*;
 use std::collections::HashMap;
 
diff --git a/src/commands/from_json.rs b/src/commands/from_json.rs
index e81d81e281..36dae4b1b1 100644
--- a/src/commands/from_json.rs
+++ b/src/commands/from_json.rs
@@ -1,5 +1,5 @@
 use crate::object::base::OF64;
-use crate::object::{Dictionary, Primitive, SpannedDictBuilder, Value};
+use crate::object::{Primitive, SpannedDictBuilder, Value};
 use crate::prelude::*;
 
 fn convert_json_value_to_nu_value(v: &serde_hjson::Value, span: impl Into<Span>) -> Spanned<Value> {
diff --git a/src/commands/from_toml.rs b/src/commands/from_toml.rs
index ffea6fd5d7..1745548eeb 100644
--- a/src/commands/from_toml.rs
+++ b/src/commands/from_toml.rs
@@ -1,5 +1,5 @@
 use crate::object::base::OF64;
-use crate::object::{Dictionary, Primitive, SpannedDictBuilder, Value};
+use crate::object::{Primitive, SpannedDictBuilder, Value};
 use crate::prelude::*;
 
 fn convert_toml_value_to_nu_value(v: &toml::Value, span: impl Into<Span>) -> Spanned<Value> {
diff --git a/src/commands/from_xml.rs b/src/commands/from_xml.rs
index ebfce83e98..db56cb830d 100644
--- a/src/commands/from_xml.rs
+++ b/src/commands/from_xml.rs
@@ -1,4 +1,4 @@
-use crate::object::{Dictionary, Primitive, SpannedDictBuilder, Value};
+use crate::object::{Primitive, SpannedDictBuilder, Value};
 use crate::prelude::*;
 
 fn from_node_to_value<'a, 'd>(
diff --git a/src/commands/from_yaml.rs b/src/commands/from_yaml.rs
index 3c9de7302f..12121037bc 100644
--- a/src/commands/from_yaml.rs
+++ b/src/commands/from_yaml.rs
@@ -1,5 +1,5 @@
 use crate::object::base::OF64;
-use crate::object::{Dictionary, Primitive, SpannedDictBuilder, Value};
+use crate::object::{Primitive, SpannedDictBuilder, Value};
 use crate::prelude::*;
 
 fn convert_yaml_value_to_nu_value(v: &serde_yaml::Value, span: impl Into<Span>) -> Spanned<Value> {
diff --git a/src/commands/to_json.rs b/src/commands/to_json.rs
index 0a79ca48c5..335ceee175 100644
--- a/src/commands/to_json.rs
+++ b/src/commands/to_json.rs
@@ -45,15 +45,17 @@ pub fn to_json(args: CommandArgs) -> Result<OutputStream, ShellError> {
     let name_span = args.name_span;
     Ok(out
         .values
-        .map(move |a| match serde_json::to_string(&a) {
-            Ok(x) => {
-                ReturnSuccess::value(Value::Primitive(Primitive::String(x)).spanned(name_span))
-            }
-            Err(_) => Err(ShellError::maybe_labeled_error(
-                "Can not convert to JSON string",
-                "can not convert piped data to JSON string",
-                name_span,
-            )),
-        })
+        .map(
+            move |a| match serde_json::to_string(&value_to_json_value(&a)) {
+                Ok(x) => {
+                    ReturnSuccess::value(Value::Primitive(Primitive::String(x)).spanned(name_span))
+                }
+                Err(_) => Err(ShellError::maybe_labeled_error(
+                    "Can not convert to JSON string",
+                    "can not convert piped data to JSON string",
+                    name_span,
+                )),
+            },
+        )
         .to_output_stream())
 }
diff --git a/src/object/dict.rs b/src/object/dict.rs
index e0844dda57..16c7d32818 100644
--- a/src/object/dict.rs
+++ b/src/object/dict.rs
@@ -72,20 +72,6 @@ impl PartialEq<Value> for Dictionary {
 }
 
 impl Dictionary {
-    crate fn add(&mut self, name: impl Into<String>, value: impl Into<Spanned<Value>>) {
-        self.entries.insert(name.into(), value.into());
-    }
-
-    crate fn copy_dict(&self) -> Dictionary {
-        let mut out = Dictionary::default();
-
-        for (key, value) in self.entries.iter() {
-            out.add(key.clone(), value.clone());
-        }
-
-        out
-    }
-
     pub fn get_data(&'a self, desc: &String) -> MaybeOwned<'a, Value> {
         match self.entries.get(desc) {
             Some(v) => MaybeOwned::Borrowed(v),
diff --git a/src/object/files.rs b/src/object/files.rs
index 210ff5405e..0e031b1544 100644
--- a/src/object/files.rs
+++ b/src/object/files.rs
@@ -1,5 +1,5 @@
 use crate::errors::ShellError;
-use crate::object::{Dictionary, SpannedDictBuilder, Value};
+use crate::object::{SpannedDictBuilder, Value};
 use crate::prelude::*;
 
 #[derive(Debug)]
diff --git a/src/parser/parse/span.rs b/src/parser/parse/span.rs
index 3886f40e18..7b98a00a29 100644
--- a/src/parser/parse/span.rs
+++ b/src/parser/parse/span.rs
@@ -1,7 +1,7 @@
 use crate::Text;
 use derive_new::new;
 use getset::Getters;
-use serde::{Serialize, Serializer};
+use serde::Serialize;
 use serde_derive::Deserialize;
 
 #[derive(
diff --git a/src/prelude.rs b/src/prelude.rs
index 67454939c6..7316efada3 100644
--- a/src/prelude.rs
+++ b/src/prelude.rs
@@ -40,7 +40,7 @@ crate use crate::context::Context;
 crate use crate::env::host::handle_unexpected;
 crate use crate::env::{Environment, Host};
 crate use crate::errors::ShellError;
-crate use crate::object::types::{ExtractType, Type};
+crate use crate::object::types::ExtractType;
 crate use crate::object::{Primitive, Value};
 crate use crate::parser::{Span, Spanned, SpannedItem};
 crate use crate::stream::{InputStream, OutputStream};