diff --git a/CHANGELOG.md b/CHANGELOG.md
index 803ab43..d61f356 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- Add `--json` flag to `progress` frontend.
+  - Prints the output as json instead of using a human readable format.
+
 ### Changed
 
 - Improve lifetime usage and avoid unnecessary clones on Rust side.
diff --git a/src/rs/mapfile.rs b/src/rs/mapfile.rs
index 10da48e..af28b6c 100644
--- a/src/rs/mapfile.rs
+++ b/src/rs/mapfile.rs
@@ -242,7 +242,9 @@ impl MapFile {
         self.segments_list = Self::post_process_segments_gnu(temp_segment_list);
     }
 
-    fn post_process_segments_gnu(temp_segment_list: Vec<segment::Segment>) -> Vec<segment::Segment> {
+    fn post_process_segments_gnu(
+        temp_segment_list: Vec<segment::Segment>,
+    ) -> Vec<segment::Segment> {
         let mut segments_list = Vec::with_capacity(temp_segment_list.len());
 
         for (i, segment) in temp_segment_list.into_iter().enumerate() {
@@ -426,7 +428,9 @@ impl MapFile {
         self.segments_list = Self::post_process_segments_lld(temp_segment_list);
     }
 
-    fn post_process_segments_lld(temp_segment_list: Vec<segment::Segment>) -> Vec<segment::Segment> {
+    fn post_process_segments_lld(
+        temp_segment_list: Vec<segment::Segment>,
+    ) -> Vec<segment::Segment> {
         let mut segments_list = Vec::with_capacity(temp_segment_list.len());
 
         for (i, segment) in temp_segment_list.into_iter().enumerate() {