diff --git a/.gitignore b/.gitignore
index 6f38f4a..3d84a77 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,3 +11,5 @@ target/
 
 # Ignore GIF files in the tapes directory
 tapes/*.gif
+
+.vscode
diff --git a/Cargo.lock b/Cargo.lock
index 6c14d02..931afb0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -503,9 +503,9 @@ dependencies = [
 
 [[package]]
 name = "promkit"
-version = "0.3.2"
+version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dfa31233c1a91cf9b5e8753a57b59a3bcca559f45f38da508857fb866635ab92"
+checksum = "a5d06099a0a47b6bd7414d6692596b754a12ec4537fc46b72c7363a88fee66d9"
 dependencies = [
  "anyhow",
  "crossterm",
diff --git a/Cargo.toml b/Cargo.toml
index 4139a9e..fb819d4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,7 +13,7 @@ anyhow = "1.0.80"
 clap = { version = "4.5.1", features = ["derive"] }
 gag = "1.0.0"
 j9 = "0.1.3"
-promkit = "0.3.2"
+promkit = "0.3.3"
 radix_trie = "0.2.1"
 
 # The profile that 'cargo dist' will build with
diff --git a/src/jnv.rs b/src/jnv.rs
index 19a4497..5518a95 100644
--- a/src/jnv.rs
+++ b/src/jnv.rs
@@ -18,6 +18,7 @@ use promkit::{
     text, text_editor, Prompt, PromptSignal, Renderer,
 };
 
+mod editing;
 mod keymap;
 mod render;
 mod trie;
@@ -83,6 +84,7 @@ impl Jnv {
                 active_char_style: StyleBuilder::new().bgc(Color::Magenta).build(),
                 inactive_char_style: StyleBuilder::new().build(),
                 edit_mode,
+                word_break_chars: Default::default(),
                 lines: Default::default(),
             },
             hint_message_renderer: text::Renderer {
@@ -292,6 +294,8 @@ impl Jnv {
         let suggest_clone = rc_self_clone.borrow().suggest.clone();
         let suggest_renderer_clone = rc_self_clone.borrow().suggest_renderer.clone();
         let json_renderer_clone = rc_self_clone.borrow().json_renderer.clone();
+        let input_json_stream_clone = rc_self_clone.borrow().input_json_stream.clone();
+
         Ok(Prompt::try_new(
             Box::new(self::render::Renderer {
                 keymap: keymap_clone,
@@ -302,6 +306,7 @@ impl Jnv {
                 suggest: suggest_clone,
                 suggest_snapshot: Snapshot::<listbox::Renderer>::new(suggest_renderer_clone),
                 json_snapshot: Snapshot::<json::Renderer>::new(json_renderer_clone),
+                input_json_stream: input_json_stream_clone
             }),
             Box::new(
                 move |event: &Event,
diff --git a/src/jnv/editing.rs b/src/jnv/editing.rs
new file mode 100644
index 0000000..e75fb20
--- /dev/null
+++ b/src/jnv/editing.rs
@@ -0,0 +1,119 @@
+use gag::Gag;
+use promkit::serde_json::Value;
+
+pub fn add_to_nearest_array_index(renderer: &mut crate::jnv::render::Renderer, value: isize) -> bool {
+    let query_editor_after_mut = renderer.query_editor_snapshot.after_mut();
+    let cursor = query_editor_after_mut.texteditor.position();
+    let query = query_editor_after_mut
+        .texteditor
+        .text_without_cursor()
+        .to_string();
+    let mut previous = None;
+    let mut previous_distance = usize::MAX;
+    let mut pos = 0;
+
+    while pos < query.len() {
+        match find_array_index(&query, pos) {
+            Some((start, end)) => {
+                let distance = distance_from(start, end, cursor);
+                if distance < previous_distance {
+                    previous = Some((start, end));
+                    previous_distance = distance;
+                }
+                if distance == 0 {
+                    pos = query.len()
+                } else {
+                    pos = end + 1;
+                }
+            }
+            None => {
+                pos += 1
+            }
+        }
+    }
+    match previous {
+        None => false,
+        Some((start, end)) => {
+            let before = &query[0..start + 1]; // ends with '['
+            let after = &query[end..]; // starts with ']'
+            let number = &query[start + 1..end];
+            let current_value: isize = match number.parse() {
+                Ok(value) => value,
+                Err(_) => return false,
+            };
+            let mut new_value = current_value + value;
+
+            // array bound checking and cycling
+            let array = &before[..before.len() - 1];
+            let len = query_array_length(&renderer.input_json_stream, array);
+            if len == -1 {
+                return false;
+            }
+
+            if current_value == 0 && new_value == -1 {
+                new_value = len - 1;
+            }
+            if new_value > 0 && new_value >= len {
+                new_value = 0;
+            } else if new_value < -len {
+                new_value = -1;
+            }
+            let new_query = format!("{before}{new_value}{after}");
+            query_editor_after_mut.texteditor.replace(&new_query);
+            let mut npos = query_editor_after_mut.texteditor.position();
+            while npos > cursor {
+                query_editor_after_mut.texteditor.backward();
+                npos = query_editor_after_mut.texteditor.position();
+            }
+            true
+        }
+    }
+}
+
+fn query_array_length(input_json_stream: &[Value], array: &str) -> isize {
+    let stream_len = input_json_stream.len();
+    if stream_len == 0 || stream_len > 1 {
+        // honestly, don't now how to handle it
+        return -1;
+    }
+    let query_len = format!("{array} | length");
+    let v = &input_json_stream[0];
+
+    let _ignore_err = Gag::stderr().unwrap();
+
+    match j9::run(&query_len, &v.to_string()) {
+        Ok(ret) => {
+            if ret.is_empty() {
+                -1
+            } else {
+                ret[0].parse().unwrap()
+            }
+        }
+        Err(_e) => -1,
+    }
+}
+
+fn distance_from(start: usize, end: usize, cursor: usize) -> usize {
+    if start <= cursor && cursor < end {
+        0
+    } else if cursor < start {
+        start - cursor
+    } else {
+        cursor - end
+    }
+}
+fn find_array_index(query: &str, start: usize) -> Option<(usize, usize)> {
+    let iter = query.chars().enumerate().skip(start);
+    let mut iter = iter.skip_while(|(_, ch)| *ch != '[');
+    let start = match iter.next() {
+        None => return None,
+        Some((pos, _)) => pos,
+    };
+    let mut iter = iter.skip_while(|(i, ch)| *i == start + 1 && *ch == '-');
+    let _minus = iter.next().is_some();
+    let mut iter = iter.skip_while(|(_, ch)| ch.is_ascii_digit());
+    match iter.next() {
+        Some((end, ']')) => Some((start, end)),
+        _ => None
+    }
+}
diff --git a/src/jnv/keymap.rs b/src/jnv/keymap.rs
index cc48bab..cf54214 100644
--- a/src/jnv/keymap.rs
+++ b/src/jnv/keymap.rs
@@ -1,3 +1,4 @@
+use super::editing::add_to_nearest_array_index;
 use promkit::{
     crossterm::event::{Event, KeyCode, KeyEvent, KeyEventKind, KeyEventState, KeyModifiers},
     listbox::Listbox,
@@ -163,6 +164,23 @@ pub fn default(event: &Event, renderer: &mut crate::jnv::render::Renderer) -> Re
             json_after_mut.stream.collapse_all();
         }
 
+        Event::Key(KeyEvent {
+            code: KeyCode::Down,
+            modifiers: KeyModifiers::SHIFT,
+            kind: KeyEventKind::Press,
+            state: KeyEventState::NONE,
+        }) => {
+            add_to_nearest_array_index(renderer, 1);
+        }
+        Event::Key(KeyEvent {
+            code: KeyCode::Up,
+            modifiers: KeyModifiers::SHIFT,
+            kind: KeyEventKind::Press,
+            state: KeyEventState::NONE,
+        }) => {
+            add_to_nearest_array_index(renderer, -1);
+        }
+
         // Input char.
         Event::Key(KeyEvent {
             code: KeyCode::Char(ch),
diff --git a/src/jnv/render.rs b/src/jnv/render.rs
index 6a275c4..a5d6fb0 100644
--- a/src/jnv/render.rs
+++ b/src/jnv/render.rs
@@ -1,6 +1,5 @@
 use promkit::{
-    impl_as_any, impl_cast, json, keymap::KeymapManager, listbox, pane::Pane, snapshot::Snapshot,
-    suggest::Suggest, text, text_editor,
+    impl_as_any, impl_cast, json, keymap::KeymapManager, listbox, pane::Pane, serde_json::Value, snapshot::Snapshot, suggest::Suggest, text, text_editor
 };
 
 #[derive(Clone)]
@@ -11,6 +10,7 @@ pub struct Renderer {
     pub suggest: Suggest,
     pub suggest_snapshot: Snapshot<listbox::Renderer>,
     pub json_snapshot: Snapshot<json::Renderer>,
+    pub input_json_stream: Vec<Value>
 }
 
 impl_as_any!(Renderer);