diff --git a/content/docs/standards/_index.md b/content/docs/standards/_index.md
index 52946a9..212cb35 100644
--- a/content/docs/standards/_index.md
+++ b/content/docs/standards/_index.md
@@ -2,7 +2,7 @@
 title: "Standards"
 linkTitle: "Standards"
 weight: 20
-description: "Per-language tooling standards for Python, Bash, Terraform, Ansible, Ruby, Go, and universal security tools."
+description: "Per-language tooling standards for Python, Bash, Terraform, Ansible, Ruby, Go, JavaScript/TypeScript, and universal security tools."
 ---
 
 DevRail defines opinionated tooling standards for each supported language ecosystem. Every tool is pre-installed in the dev-toolchain container and invoked through consistent Makefile targets.
@@ -11,15 +11,15 @@ DevRail defines opinionated tooling standards for each supported language ecosys
 
 The following table shows the default tool for each concern per language. These tools are pre-installed in the `dev-toolchain` container.
 
-| Concern | Python | Bash | Terraform | Ansible | Ruby | Go |
-|---|---|---|---|---|---|---|
-| Linter | ruff | shellcheck | tflint | ansible-lint | rubocop, reek | golangci-lint |
-| Formatter | ruff format | shfmt | terraform fmt | -- | rubocop | gofumpt |
-| Security | bandit, semgrep | -- | tfsec, checkov | -- | brakeman, bundler-audit | govulncheck |
-| Tests | pytest | bats | terratest | molecule | rspec | go test |
-| Type Check | mypy | -- | -- | -- | sorbet | -- |
-| Docs | -- | -- | terraform-docs | -- | -- | -- |
-| Universal | trivy, gitleaks | trivy, gitleaks | trivy, gitleaks | trivy, gitleaks | trivy, gitleaks | trivy, gitleaks |
+| Concern | Python | Bash | Terraform | Ansible | Ruby | Go | JavaScript |
+|---|---|---|---|---|---|---|---|
+| Linter | ruff | shellcheck | tflint | ansible-lint | rubocop, reek | golangci-lint | eslint |
+| Formatter | ruff format | shfmt | terraform fmt | -- | rubocop | gofumpt | prettier |
+| Security | bandit, semgrep | -- | tfsec, checkov | -- | brakeman, bundler-audit | govulncheck | npm audit |
+| Tests | pytest | bats | terratest | molecule | rspec | go test | vitest |
+| Type Check | mypy | -- | -- | -- | sorbet | -- | tsc |
+| Docs | -- | -- | terraform-docs | -- | -- | -- | -- |
+| Universal | trivy, gitleaks | trivy, gitleaks | trivy, gitleaks | trivy, gitleaks | trivy, gitleaks | trivy, gitleaks | trivy, gitleaks |
 
 A `--` entry means the concern does not apply to that language. Universal tools run for all projects regardless of declared languages.
 
@@ -29,10 +29,10 @@ Each Makefile target runs the relevant tools for all languages declared in `.dev
 
 | Target | What It Runs |
 |---|---|
-| `make lint` | ruff check, shellcheck, tflint, ansible-lint, mypy, rubocop, reek, golangci-lint |
-| `make format` | ruff format, shfmt, terraform fmt, rubocop, gofumpt |
-| `make test` | pytest, bats, terratest, molecule, rspec, go test |
-| `make security` | bandit, semgrep, tfsec, checkov, brakeman, bundler-audit, govulncheck |
+| `make lint` | ruff check, shellcheck, tflint, ansible-lint, mypy, rubocop, reek, golangci-lint, eslint, tsc |
+| `make format` | ruff format, shfmt, terraform fmt, rubocop, gofumpt, prettier |
+| `make test` | pytest, bats, terratest, molecule, rspec, go test, vitest |
+| `make security` | bandit, semgrep, tfsec, checkov, brakeman, bundler-audit, govulncheck, npm audit |
 | `make scan` | trivy, gitleaks (universal -- all projects) |
 | `make docs` | terraform-docs |
 | `make check` | All of the above in sequence |
@@ -45,6 +45,7 @@ Each Makefile target runs the relevant tools for all languages declared in `.dev
 - [Ansible Standards](/docs/standards/ansible/) -- ansible-lint, molecule
 - [Ruby Standards](/docs/standards/ruby/) -- rubocop, brakeman, bundler-audit, rspec, reek, sorbet
 - [Go Standards](/docs/standards/go/) -- golangci-lint, gofumpt, govulncheck, go test
+- [JavaScript Standards](/docs/standards/javascript/) -- eslint, prettier, npm audit, vitest, tsc
 - [Universal Security](/docs/standards/universal/) -- trivy, gitleaks
 
 ## Consistent Page Structure
diff --git a/content/docs/standards/javascript.md b/content/docs/standards/javascript.md
new file mode 100644
index 0000000..ecc1c2e
--- /dev/null
+++ b/content/docs/standards/javascript.md
@@ -0,0 +1,172 @@
+---
+title: "JavaScript"
+linkTitle: "JavaScript"
+weight: 35
+description: "JavaScript/TypeScript tooling standards: ESLint, Prettier, npm audit, Vitest, and tsc."
+---
+
+JavaScript and TypeScript projects use ESLint for linting, Prettier for formatting, npm audit for security scanning, Vitest for testing, and tsc for type checking. A single `javascript` entry in `.devrail.yml` covers both languages.
+
+## Tools
+
+| Category | Tool | Purpose |
+|---|---|---|
+| Linter | ESLint v9 | JavaScript/TypeScript linter (flat config) |
+| Formatter | Prettier | Opinionated code formatter (JS/TS/JSON/CSS/MD) |
+| Security | npm audit | Scans `package-lock.json` for known vulnerabilities |
+| Tests | Vitest | Fast, ESM-native test runner (Jest-compatible API) |
+| Type Check | tsc --noEmit | TypeScript compiler (gated on `tsconfig.json`) |
+
+All tools are pre-installed in the dev-toolchain container. Do not install them on the host.
+
+## Configuration
+
+### ESLint
+
+Config file: `eslint.config.js` (flat config) at repository root.
+
+```js
+// eslint.config.js -- DevRail JS/TS lint configuration
+import eslint from "@eslint/js";
+import tseslint from "typescript-eslint";
+
+export default tseslint.config(
+  eslint.configs.recommended,
+  tseslint.configs.recommended,
+  {
+    ignores: ["node_modules/", "dist/", "build/", "coverage/"],
+  }
+);
+```
+
+For JavaScript-only projects (no TypeScript):
+
+```js
+// eslint.config.js -- DevRail JS-only lint configuration
+import eslint from "@eslint/js";
+
+export default [
+  eslint.configs.recommended,
+  {
+    ignores: ["node_modules/", "dist/", "build/", "coverage/"],
+  },
+];
+```
+
+ESLint v9 uses flat config (`eslint.config.js`), not the legacy `.eslintrc` format. The `@eslint/js` and `typescript-eslint` packages are installed globally in the container so flat config imports resolve without project-local `node_modules`.
+
+### Prettier
+
+Config file: `.prettierrc` at repository root.
+
+```json
+{
+  "semi": true,
+  "singleQuote": false,
+  "trailingComma": "es5",
+  "printWidth": 80,
+  "tabWidth": 2
+}
+```
+
+A `.prettierignore` file is required to exclude generated files:
+
+```
+node_modules/
+dist/
+build/
+coverage/
+```
+
+Prettier formats JS, TS, JSON, CSS, and Markdown files. The `.prettierignore` controls scope.
+
+### TypeScript
+
+Config file: `tsconfig.json` at repository root. When present, `tsc --noEmit` runs as part of `make lint`.
+
+```json
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "strict": true,
+    "noEmit": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "resolveJsonModule": true,
+    "isolatedModules": true
+  },
+  "include": ["src"],
+  "exclude": ["node_modules", "dist", "build"]
+}
+```
+
+### Vitest
+
+Config file: `vitest.config.ts` (or `vitest.config.js`) at repository root.
+
+```ts
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    globals: true,
+    environment: "node",
+    coverage: {
+      reporter: ["text", "json", "html"],
+    },
+  },
+});
+```
+
+## Makefile Targets
+
+| Target | Command | Description |
+|---|---|---|
+| `make lint` | `eslint .` | Lint all JS/TS files |
+| `make lint` | `tsc --noEmit` | Type check (if `tsconfig.json` exists) |
+| `make format` | `prettier --check .` | Check formatting |
+| `make security` | `npm audit --audit-level=moderate` | Dependency vulnerability scanning (if `package-lock.json` exists) |
+| `make test` | `vitest run` | Run test suite (if `*.test.*` or `*.spec.*` files exist) |
+
+## Pre-Commit Hooks
+
+### Local Hooks (run on every commit, under 30 seconds)
+
+ESLint and Prettier run on every commit to catch lint and formatting issues:
+
+```yaml
+# .pre-commit-config.yaml -- JavaScript/TypeScript hooks
+repos:
+  - repo: https://github.com/pre-commit/mirrors-eslint
+    rev: v9.27.0
+    hooks:
+      - id: eslint
+        additional_dependencies:
+          - eslint
+          - "@eslint/js"
+          - typescript-eslint
+          - typescript
+
+  - repo: https://github.com/pre-commit/mirrors-prettier
+    rev: v4.0.0-alpha.8
+    hooks:
+      - id: prettier
+```
+
+### CI-Only (too slow for local hooks)
+
+- `npm audit --audit-level=moderate` -- dependency vulnerability scanning
+- `vitest run` -- full test suite
+
+## Notes
+
+- **Single `javascript` entry covers both JS and TS.** Do not add a separate `typescript` entry to `.devrail.yml`. TypeScript support auto-activates when `tsconfig.json` is present.
+- **ESLint v9 uses flat config.** The config file is `eslint.config.js` (not `.eslintrc`). The `@eslint/js` and `typescript-eslint` packages provide rule configurations for the flat config format.
+- **tsc runs under `make lint`, not a separate target.** Type checking is static analysis (like mypy for Python). It is gated on `tsconfig.json` presence.
+- **Prettier formats more than JS/TS.** Prettier handles JSON, CSS, Markdown, and other file types. Projects must use `.prettierignore` to exclude generated files.
+- **npm audit gates on `package-lock.json`.** If no `package-lock.json` exists, npm audit is skipped because there are no locked dependencies to scan.
+- **Vitest gates on test file presence.** If no `*.test.*` or `*.spec.*` files exist, vitest is skipped.
+- **All tools are pre-installed in the dev-toolchain container.** Do not install them on the host.