diff --git a/keymap.go b/keymap.go
index effca80..4057399 100644
--- a/keymap.go
+++ b/keymap.go
@@ -3,24 +3,28 @@ package main
 import "github.com/charmbracelet/bubbles/key"
 
 type KeyMap struct {
-	Quit         key.Binding
-	Help         key.Binding
-	PageDown     key.Binding
-	PageUp       key.Binding
-	HalfPageUp   key.Binding
-	HalfPageDown key.Binding
-	Down         key.Binding
-	Up           key.Binding
-	Expand       key.Binding
-	Collapse     key.Binding
-	GotoTop      key.Binding
-	GotoBottom   key.Binding
-	ToggleWrap   key.Binding
-	ExpandAll    key.Binding
-	CollapseAll  key.Binding
-	Search       key.Binding
-	Next         key.Binding
-	Prev         key.Binding
+	Quit                key.Binding
+	Help                key.Binding
+	PageDown            key.Binding
+	PageUp              key.Binding
+	HalfPageUp          key.Binding
+	HalfPageDown        key.Binding
+	Down                key.Binding
+	Up                  key.Binding
+	Expand              key.Binding
+	Collapse            key.Binding
+	NextSibling         key.Binding
+	PrevSibling         key.Binding
+	ExpandRecursively   key.Binding
+	CollapseRecursively key.Binding
+	GotoTop             key.Binding
+	GotoBottom          key.Binding
+	ToggleWrap          key.Binding
+	ExpandAll           key.Binding
+	CollapseAll         key.Binding
+	Search              key.Binding
+	Next                key.Binding
+	Prev                key.Binding
 }
 
 func DefaultKeyMap() KeyMap {
@@ -65,6 +69,22 @@ func DefaultKeyMap() KeyMap {
 			key.WithKeys("left", "h"),
 			key.WithHelp("", "collapse"),
 		),
+		NextSibling: key.NewBinding(
+			key.WithKeys("J"),
+			key.WithHelp("", "next sibling"),
+		),
+		PrevSibling: key.NewBinding(
+			key.WithKeys("K"),
+			key.WithHelp("", "previous sibling"),
+		),
+		ExpandRecursively: key.NewBinding(
+			key.WithKeys("L"),
+			key.WithHelp("", "expand recursively"),
+		),
+		CollapseRecursively: key.NewBinding(
+			key.WithKeys("H"),
+			key.WithHelp("", "collapse recursively"),
+		),
 		GotoTop: key.NewBinding(
 			key.WithKeys("g"),
 			key.WithHelp("", "goto top"),
diff --git a/main.go b/main.go
index 78589e7..5db0487 100644
--- a/main.go
+++ b/main.go
@@ -39,6 +39,7 @@ var colors = struct {
 
 func main() {
 	filePath := ""
+	args := []string{}
 	var dec *json.Decoder
 	if term.IsTerminal(int(os.Stdin.Fd())) {
 		if len(os.Args) >= 2 {
@@ -48,9 +49,11 @@ func main() {
 				panic(err)
 			}
 			dec = json.NewDecoder(f)
+			args = os.Args[2:]
 		}
 	} else {
 		dec = json.NewDecoder(os.Stdin)
+		args = os.Args[1:]
 	}
 	dec.UseNumber()
 	jsonObject, err := parse(dec)
@@ -58,24 +61,37 @@ func main() {
 		panic(err)
 	}
 
+	if len(args) > 0 {
+		if args[0] == "--print-code" {
+			fmt.Print(generateCode(args[1:]))
+			return
+		}
+		reduce(jsonObject, args)
+		return
+	}
+
 	expand := map[string]bool{
 		"": true,
 	}
-
 	if array, ok := jsonObject.(array); ok {
 		for i := range array {
 			expand[accessor("", i)] = true
 		}
 	}
-
 	parents := map[string]string{}
+	children := map[string][]string{}
+	canBeExpanded := map[string]bool{}
 	dfs(jsonObject, func(it iterator) {
 		parents[it.path] = it.parent
-	})
+		children[it.parent] = append(children[it.parent], it.path)
+		switch it.object.(type) {
+		case *dict, array:
+			canBeExpanded[it.path] = true
 
+		}
+	})
 	input := textinput.New()
 	input.Prompt = ""
-
 	m := &model{
 		fileName:        path.Base(filePath),
 		json:            jsonObject,
@@ -84,7 +100,9 @@ func main() {
 		mouseWheelDelta: 3,
 		keyMap:          DefaultKeyMap(),
 		expandedPaths:   expand,
+		canBeExpanded:   canBeExpanded,
 		parents:         parents,
+		children:        children,
 		wrap:            true,
 		searchInput:     input,
 	}
@@ -112,12 +130,13 @@ type model struct {
 	keyMap   KeyMap
 	showHelp bool
 
-	expandedPaths    map[string]bool   // a set with expanded paths
-	canBeExpanded    map[string]bool   // a set for path => can be expanded (i.e. dict or array)
-	pathToLineNumber *dict             // dict with path => line number
-	lineNumberToPath map[int]string    // map of line number => path
-	parents          map[string]string // map of subpath => parent path
-	cursor           int               // cursor in range of m.pathToLineNumber.keys slice
+	expandedPaths    map[string]bool     // a set with expanded paths
+	canBeExpanded    map[string]bool     // a set for path => can be expanded (i.e. dict or array)
+	pathToLineNumber *dict               // dict with path => line number
+	lineNumberToPath map[int]string      // map of line number => path
+	parents          map[string]string   // map of subpath => parent path
+	children         map[string][]string // map of path => child paths
+	cursor           int                 // cursor in range of m.pathToLineNumber.keys slice
 	showCursor       bool
 
 	wrap                    bool
@@ -234,6 +253,18 @@ func (m *model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 				m.SetOffset(at)
 			}
 
+		case key.Matches(msg, m.keyMap.NextSibling):
+			m.showCursor = true
+			// TODO: write code for collecting siblings,
+			// and write code to getting sibling and jumping to it.
+			m.render()
+			at := m.cursorLineNumber()
+			if m.offset <= at { // cursor is lower
+				m.LineDown(max(0, at-(m.offset+m.height-1))) // minus one is due to cursorLineNumber() starts from 0
+			} else {
+				m.SetOffset(at)
+			}
+
 		case key.Matches(msg, m.keyMap.Up):
 			m.showCursor = true
 			if m.cursor > 0 {
@@ -255,14 +286,27 @@ func (m *model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			m.expandedPaths[m.cursorPath()] = true
 			m.render()
 
-		case key.Matches(msg, m.keyMap.Collapse):
+		case key.Matches(msg, m.keyMap.ExpandRecursively):
+			m.showCursor = true
+			m.expandRecursively(m.cursorPath())
+			m.render()
+
+		case key.Matches(msg, m.keyMap.Collapse, m.keyMap.CollapseRecursively):
 			m.showCursor = true
 			if m.expandedPaths[m.cursorPath()] {
-				m.expandedPaths[m.cursorPath()] = false
+				if key.Matches(msg, m.keyMap.CollapseRecursively) {
+					m.collapseRecursively(m.cursorPath())
+				} else {
+					m.expandedPaths[m.cursorPath()] = false
+				}
 			} else {
 				parentPath, ok := m.parents[m.cursorPath()]
 				if ok {
-					m.expandedPaths[parentPath] = false
+					if key.Matches(msg, m.keyMap.CollapseRecursively) {
+						m.collapseRecursively(m.cursorPath())
+					} else {
+						m.expandedPaths[m.cursorPath()] = false
+					}
 					index, _ := m.pathToLineNumber.index(parentPath)
 					m.cursor = index
 				}
@@ -382,7 +426,6 @@ func (m *model) render() {
 	}
 
 	m.pathToLineNumber = newDict()
-	m.canBeExpanded = map[string]bool{}
 	m.lineNumberToPath = map[int]string{}
 	m.lines = m.print(m.json, 1, 0, 0, "", false)
 
@@ -407,3 +450,23 @@ func (m *model) cursorLineNumber() int {
 	}
 	return -1
 }
+
+func (m *model) expandRecursively(path string) {
+	if m.canBeExpanded[path] {
+		m.expandedPaths[path] = true
+		for _, childPath := range m.children[path] {
+			if childPath != "" {
+				m.expandRecursively(childPath)
+			}
+		}
+	}
+}
+
+func (m *model) collapseRecursively(path string) {
+	m.expandedPaths[path] = false
+	for _, childPath := range m.children[path] {
+		if childPath != "" {
+			m.collapseRecursively(childPath)
+		}
+	}
+}
diff --git a/print.go b/print.go
index 75dd0e5..6be0252 100644
--- a/print.go
+++ b/print.go
@@ -7,6 +7,68 @@ import (
 	"strings"
 )
 
+func prettyPrint(v interface{}, level int) string {
+	ident := strings.Repeat("  ", level)
+	subident := strings.Repeat("  ", level-1)
+	switch v.(type) {
+	case nil:
+		return colors.null.Render("null")
+
+	case bool:
+		if v.(bool) {
+			return colors.boolean.Render("true")
+		} else {
+			return colors.boolean.Render("false")
+		}
+
+	case json.Number:
+		return colors.number.Render(v.(json.Number).String())
+
+	case string:
+		return colors.string.Render(fmt.Sprintf("%q", v))
+
+	case *dict:
+		keys := v.(*dict).keys
+		if len(keys) == 0 {
+			return colors.bracket.Render("{}")
+		}
+		output := colors.bracket.Render("{\n")
+		for i, k := range keys {
+			key := colors.key.Render(fmt.Sprintf("%q", k))
+			value, _ := v.(*dict).get(k)
+			delim := ": "
+			line := ident + key + delim + prettyPrint(value, level+1)
+			if i < len(keys)-1 {
+				line += ",\n"
+			} else {
+				line += "\n"
+			}
+			output += line
+		}
+		return output + subident + colors.bracket.Render("}")
+
+	case array:
+		slice := v.(array)
+		if len(slice) == 0 {
+			return colors.bracket.Render("[]")
+		}
+		output := colors.bracket.Render("[\n")
+		for i, value := range v.(array) {
+			line := ident + prettyPrint(value, level+1)
+			if i < len(slice)-1 {
+				line += ",\n"
+			} else {
+				line += "\n"
+			}
+			output += line
+		}
+		return output + subident + colors.bracket.Render("]")
+
+	default:
+		return "unknown type"
+	}
+}
+
 func (m *model) print(v interface{}, level, lineNumber, keyEndPos int, path string, dontHighlightCursor bool) []string {
 	ident := strings.Repeat("  ", level)
 	subident := strings.Repeat("  ", level-1)
@@ -50,7 +112,6 @@ func (m *model) print(v interface{}, level, lineNumber, keyEndPos int, path stri
 
 	case *dict:
 		m.pathToLineNumber.set(path, lineNumber)
-		m.canBeExpanded[path] = true
 		m.lineNumberToPath[lineNumber] = path
 		bracketStyle := cursorOr(colors.bracket).Render
 		if len(v.(*dict).keys) == 0 {
@@ -102,7 +163,6 @@ func (m *model) print(v interface{}, level, lineNumber, keyEndPos int, path stri
 
 	case array:
 		m.pathToLineNumber.set(path, lineNumber)
-		m.canBeExpanded[path] = true
 		m.lineNumberToPath[lineNumber] = path
 		bracketStyle := cursorOr(colors.bracket).Render
 		if len(v.(array)) == 0 {
diff --git a/search.go b/search.go
index 0c63252..988ff6d 100644
--- a/search.go
+++ b/search.go
@@ -86,16 +86,16 @@ func (m *model) jumpToSearchResult(at int) {
 		m.SetOffset(lineNumber.(int))
 		m.render()
 	} else {
-		m.recursiveExpand(desiredPath)
+		m.expandToPath(desiredPath)
 		m.render()
 		m.jumpToSearchResult(at)
 	}
 }
 
-func (m *model) recursiveExpand(path string) {
+func (m *model) expandToPath(path string) {
 	m.expandedPaths[path] = true
 	if path != "" {
-		m.recursiveExpand(m.parents[path])
+		m.expandToPath(m.parents[path])
 	}
 }
 
diff --git a/util.go b/util.go
index 2df2cce..0914f5e 100644
--- a/util.go
+++ b/util.go
@@ -27,12 +27,49 @@ func max(a, b int) int {
 	return b
 }
 
-func stringify(x interface{}) string {
-	str, err := json.Marshal(x)
-	if err != nil {
-		panic(err)
+func stringify(v interface{}) string {
+	switch v.(type) {
+	case nil:
+		return "null"
+
+	case bool:
+		if v.(bool) {
+			return "true"
+		} else {
+			return "false"
+		}
+
+	case json.Number:
+		return v.(json.Number).String()
+
+	case string:
+		return fmt.Sprintf("%q", v)
+
+	case *dict:
+		result := "{"
+		for i, key := range v.(*dict).keys {
+			line := fmt.Sprintf("%q", key) + ":" + stringify(v.(*dict).values[key])
+			if i < len(v.(*dict).keys)-1 {
+				line += ","
+			}
+			result += line
+		}
+		return result + "}"
+
+	case array:
+		result := "["
+		for i, value := range v.(array) {
+			line := stringify(value)
+			if i < len(v.(array))-1 {
+				line += ","
+			}
+			result += line
+		}
+		return result + "]"
+
+	default:
+		return "unknown type"
 	}
-	return string(str)
 }
 
 func width(s string) int {