diff --git a/lazy-lock.json b/lazy-lock.json
index 2c62387..6a1e1c4 100644
--- a/lazy-lock.json
+++ b/lazy-lock.json
@@ -5,6 +5,7 @@
   "cmp-nvim-lsp": { "branch": "main", "commit": "cbc7b02bb99fae35cb42f514762b89b5126651ef" },
   "cmp-path": { "branch": "main", "commit": "c642487086dbd9a93160e1679a1327be111cbc25" },
   "cmp_luasnip": { "branch": "master", "commit": "98d9cb5c2c38532bd9bdb481067b20fea8f32e90" },
+  "conform.nvim": { "branch": "master", "commit": "619363c30309d29ffa631e67c8183f2a72caa373" },
   "friendly-snippets": { "branch": "main", "commit": "6cd7280adead7f586db6fccbd15d2cac7e2188b9" },
   "gitsigns.nvim": { "branch": "main", "commit": "2038c666bd9d8a0b7349a0b6ee00dc83104b9ecf" },
   "lazy.nvim": { "branch": "main", "commit": "306a05526ada86a7b30af95c5cc81ffba93fef97" },
diff --git a/lua/config/ignored_patterns.lua b/lua/config/ignored_patterns.lua
new file mode 100644
index 0000000..5ace81d
--- /dev/null
+++ b/lua/config/ignored_patterns.lua
@@ -0,0 +1,160 @@
+local M = {}
+local fn = vim.fn
+local file_path = fn.stdpath("data") .. "/ignored_patterns.json"
+
+function M.load()
+  if fn.filereadable(file_path) == 0 then
+    return {
+      ".git",
+      "node_modules",
+    }
+  end
+  local file = io.open(file_path, "r")
+  if not file then return {} end
+  local content = file:read("*a")
+  file:close()
+  local ok, data = pcall(fn.json_decode, content)
+  if ok and type(data) == "table" then
+    return data
+  end
+  return {}
+end
+
+function M.save(patterns)
+  local file = io.open(file_path, "w")
+  if not file then return end
+  file:write(fn.json_encode(patterns))
+  file:close()
+end
+
+function M.get_for_nvim_tree()
+  local patterns = M.load()
+  local nvim_tree_patterns = {}
+  for _, p in ipairs(patterns) do
+    table.insert(nvim_tree_patterns, p)
+  end
+  return nvim_tree_patterns
+end
+
+function M.get_for_telescope()
+  local patterns = M.load()
+  local telescope_patterns = {}
+  for _, p in ipairs(patterns) do
+    table.insert(telescope_patterns, p)
+    -- Also ignore contents if it's a directory
+    if not p:match("[.*%%]") then
+      table.insert(telescope_patterns, p .. "/.*")
+    end
+  end
+  return telescope_patterns
+end
+
+function M.apply()
+  local nvim_tree_patterns = M.get_for_nvim_tree()
+  local telescope_patterns = M.get_for_telescope()
+
+  -- Apply to nvim-tree if loaded
+  local has_nvim_tree, nvim_tree = pcall(require, "nvim-tree")
+  if has_nvim_tree then
+    nvim_tree.setup({
+      git = {
+        ignore = false,
+      },
+      filters = {
+        dotfiles = false,
+        custom = nvim_tree_patterns,
+      },
+      view = {
+        adaptive_size = true,
+      }
+    })
+    pcall(require("nvim-tree.api").tree.reload)
+  end
+
+  -- Apply to telescope if loaded
+  local has_telescope, telescope = pcall(require, "telescope")
+  if has_telescope then
+    telescope.setup({
+      defaults = {
+        file_ignore_patterns = telescope_patterns,
+        vimgrep_arguments = {
+          "rg",
+          "--color=never",
+          "--no-heading",
+          "--with-filename",
+          "--line-number",
+          "--column",
+          "--smart-case",
+          "--no-ignore",
+        },
+      },
+      pickers = {
+        find_files = {
+          no_ignore = true,
+        },
+      },
+    })
+  end
+end
+
+function M.add(pattern)
+  if not pattern or pattern == "" then return end
+  local patterns = M.load()
+  for _, p in ipairs(patterns) do
+    if p == pattern then
+      print("Pattern already ignored: " .. pattern)
+      return
+    end
+  end
+  table.insert(patterns, pattern)
+  M.save(patterns)
+  M.apply()
+  print("Added to ignored patterns: " .. pattern)
+end
+
+function M.remove(pattern)
+  if not pattern or pattern == "" then return end
+  local patterns = M.load()
+  local index = nil
+  for i, p in ipairs(patterns) do
+    if p == pattern then
+      index = i
+      break
+    end
+  end
+  if index then
+    table.remove(patterns, index)
+    M.save(patterns)
+    M.apply()
+    print("Removed from ignored patterns: " .. pattern)
+  else
+    print("Pattern not found in ignores: " .. pattern)
+  end
+end
+
+function M.list()
+  local patterns = M.load()
+  if #patterns == 0 then
+    print("No custom ignored patterns.")
+  else
+    print("Ignored patterns:")
+    for _, p in ipairs(patterns) do
+      print(" - " .. p)
+    end
+  end
+end
+
+-- Create the custom commands
+vim.api.nvim_create_user_command("IgnoreAdd", function(opts)
+  M.add(opts.args)
+end, { nargs = 1, desc = "Add file/directory pattern to nvim-tree and telescope ignore lists" })
+
+vim.api.nvim_create_user_command("IgnoreRemove", function(opts)
+  M.remove(opts.args)
+end, { nargs = 1, desc = "Remove file/directory pattern from nvim-tree and telescope ignore lists" })
+
+vim.api.nvim_create_user_command("IgnoreList", function()
+  M.list()
+end, { desc = "List all custom ignored patterns" })
+
+return M
diff --git a/lua/config/lazy.lua b/lua/config/lazy.lua
index 65b4ff8..db21548 100644
--- a/lua/config/lazy.lua
+++ b/lua/config/lazy.lua
@@ -20,6 +20,7 @@ require("config.options")
 require("config.keymaps")
 require("config.globals")
 require("config.autocmds")
+require("config.ignored_patterns")
 
 -- Setup lazy.nvim
 require("lazy").setup({
diff --git a/lua/plugins/barbar.lua b/lua/plugins/barbar.lua
index d08d857..e9ac275 100644
--- a/lua/plugins/barbar.lua
+++ b/lua/plugins/barbar.lua
@@ -6,10 +6,9 @@ return {
     },
     init = function() vim.g.barbar_auto_setup = false end,
     opts = {
-      -- lazy.nvim will automatically call setup for you. put your options here, anything missing will use the default:
-      -- animation = true,
-      -- insert_at_start = true,
-      -- …etc.
+      sidebar_filetypes = {
+        NvimTree = true,
+      },
     },
     version = '^1.0.0', -- optional: only update when a new 1.x version is released
   }}
diff --git a/lua/plugins/format.lua b/lua/plugins/format.lua
new file mode 100644
index 0000000..925f4bc
--- /dev/null
+++ b/lua/plugins/format.lua
@@ -0,0 +1,35 @@
+return {
+  {
+    "stevearc/conform.nvim",
+    event = { "BufWritePre" },
+    cmd = { "ConformInfo" },
+    keys = {
+      {
+        "<leader>f",
+        function()
+          require("conform").format({ async = true, lsp_fallback = true })
+        end,
+        mode = "",
+        desc = "Format buffer",
+      },
+    },
+    opts = {
+      formatters_by_ft = {
+        lua = { "stylua" },
+        python = { "ruff_format" },
+        javascript = { "prettier" },
+        typescript = { "prettier" },
+        javascriptreact = { "prettier" },
+        typescriptreact = { "prettier" },
+        html = { "prettier" },
+        css = { "prettier" },
+        json = { "prettier" },
+        markdown = { "prettier" },
+      },
+      format_on_save = {
+        timeout_ms = 500,
+        lsp_fallback = true,
+      },
+    },
+  },
+}
diff --git a/lua/plugins/lsp.lua b/lua/plugins/lsp.lua
index 54c0970..4bb9a96 100644
--- a/lua/plugins/lsp.lua
+++ b/lua/plugins/lsp.lua
@@ -27,6 +27,8 @@ return {
       ensure_installed = {
         "pyright",
         "ruff",
+        "ts_ls",
+        "eslint",
       },
       automatic_installation = true,
     },
@@ -77,15 +79,13 @@ return {
             client.server_capabilities.hoverProvider = false
           end
 
-          -- Format on save if client supports it
-          if client and client:supports_method("textDocument/formatting") then
-            local format_grp = vim.api.nvim_create_augroup("LspFormat." .. bufnr, { clear = true })
+          -- Auto-fix ESLint issues on save if ESLint is active
+          if client and client.name == "eslint" then
+            local eslint_grp = vim.api.nvim_create_augroup("LspEslint." .. bufnr, { clear = true })
             vim.api.nvim_create_autocmd("BufWritePre", {
-              group = format_grp,
+              group = eslint_grp,
               buffer = bufnr,
-              callback = function()
-                vim.lsp.buf.format({ bufnr = bufnr, id = client.id, async = false })
-              end,
+              command = "EslintFixAll",
             })
           end
 
@@ -152,6 +152,26 @@ return {
         capabilities = capabilities,
       })
       vim.lsp.enable("ruff")
+
+      -- Configure ts_ls (TypeScript/JavaScript LSP) using native Neovim 0.11+ API
+      vim.lsp.config("ts_ls", {
+        capabilities = capabilities,
+        init_options = {
+          preferences = {
+            disableSuggestions = false,
+          },
+        },
+      })
+      vim.lsp.enable("ts_ls")
+
+      -- Configure ESLint (JS/TS linter) using native Neovim 0.11+ API
+      vim.lsp.config("eslint", {
+        capabilities = capabilities,
+        settings = {
+          workingDirectories = { mode = "location" },
+        },
+      })
+      vim.lsp.enable("eslint")
     end,
   },
 }
diff --git a/lua/plugins/nvim-tree.lua b/lua/plugins/nvim-tree.lua
index ec5ee27..b60f31f 100644
--- a/lua/plugins/nvim-tree.lua
+++ b/lua/plugins/nvim-tree.lua
@@ -6,13 +6,15 @@ return {
     "nvim-tree/nvim-web-devicons",
   },
   config = function()
+    local ignored = require("config.ignored_patterns")
     -- vim.cmd([[hi NvimTreeNormal guibg=NONE ctermbd=NONE]])
     require("nvim-tree").setup {
       git = {
         ignore = false,
       },
-      filters= {
+      filters = {
         dotfiles = false,
+        custom = ignored.get_for_nvim_tree(),
       },
       view = {
         adaptive_size = true,
diff --git a/lua/plugins/telescope.lua b/lua/plugins/telescope.lua
index 2b4256a..ed3ecda 100644
--- a/lua/plugins/telescope.lua
+++ b/lua/plugins/telescope.lua
@@ -6,8 +6,10 @@ return {
         { 'nvim-telescope/telescope-fzf-native.nvim', build = 'make' },
     },
     config = function()
+        local ignored = require("config.ignored_patterns")
         require('telescope').setup({
             defaults = {
+                file_ignore_patterns = ignored.get_for_telescope(),
                 vimgrep_arguments = {
                     "rg",
                     "--color=never",