diff --git a/.prettierrc b/.prettierrc
new file mode 100644
index 0000000..991a44c
--- /dev/null
+++ b/.prettierrc
@@ -0,0 +1,7 @@
+{
+  "trailingComma": "all",
+  "singleQuote": true,
+  "semi": false,
+  "arrowParens": "avoid",
+  "parser": "babel"
+}
diff --git a/package.json b/package.json
index b300500..c0023cb 100644
--- a/package.json
+++ b/package.json
@@ -6,9 +6,16 @@
   "repository": "git@git.orionkindel.com:dnim/srv.git",
   "author": "Orion Kindel <cakekindel@gmail.com>",
   "license": "MIT",
+  "scripts": {
+    "fmt:check": "prettier --check 'src/**/*.js'",
+    "fmt": "prettier --write 'src/**/*.js'"
+  },
   "dependencies": {
     "@matchbook/ts": "^1.0.0",
     "fp-ts": "^2.16.0",
     "yaml": "^2.3.1"
+  },
+  "devDependencies": {
+    "prettier": "^2.8.8"
   }
 }
diff --git a/src/cmd.js b/src/cmd.js
index bd89c03..fdee471 100644
--- a/src/cmd.js
+++ b/src/cmd.js
@@ -1,34 +1,34 @@
-const Either = require("fp-ts/Either");
-const { pipe, identity: id } = require("fp-ts/function");
-const cp = require("child_process");
+const Either = require('fp-ts/Either')
+const { pipe, identity: id } = require('fp-ts/function')
+const cp = require('child_process')
 
-const run = (script) =>
+const run = script =>
   pipe(
     Either.tryCatch(
-      () => cp.spawnSync(script, { encoding: "utf8", shell: true }),
-      id
+      () => cp.spawnSync(script, { encoding: 'utf8', shell: true }),
+      id,
     ),
-    Either.flatMap((o) => (o.error ? Either.left(o.error) : Either.right(o))),
-    Either.flatMap((o) =>
+    Either.flatMap(o => (o.error ? Either.left(o.error) : Either.right(o))),
+    Either.flatMap(o =>
       o.status > 0
         ? Either.left(
-            new Error(JSON.stringify({ reason: "status_gt_0", ...o }))
+            new Error(JSON.stringify({ reason: 'status_gt_0', ...o })),
           )
-        : Either.right(o)
+        : Either.right(o),
     ),
-    Either.map((o) => o.stdout.trim())
-  );
+    Either.map(o => o.stdout.trim()),
+  )
 
-const ignoringStatus = Either.orElse((e) =>
+const ignoringStatus = Either.orElse(e =>
   pipe(
     Either.tryCatch(() => JSON.parse(e.message), id),
-    Either.flatMap((o) =>
-      o.reason && o.reason === "status_gt_0"
+    Either.flatMap(o =>
+      o.reason && o.reason === 'status_gt_0'
         ? Either.right(o.stdout.trim())
-        : Either.left(new Error())
+        : Either.left(new Error()),
     ),
-    Either.mapLeft(() => e)
-  )
-);
+    Either.mapLeft(() => e),
+  ),
+)
 
-module.exports = { run, ignoringStatus };
+module.exports = { run, ignoringStatus }
diff --git a/src/config.js b/src/config.js
index b8fd9f2..83c18e4 100644
--- a/src/config.js
+++ b/src/config.js
@@ -1,205 +1,231 @@
-const yaml = require("yaml");
-const { strike, match, otherwise } = require("@matchbook/ts");
-const Array_ = require("fp-ts/Array");
-const Either = require("fp-ts/Either");
-const { identity: id, flow, pipe } = require("fp-ts/function");
+const yaml = require('yaml')
+const { strike, match, otherwise } = require('@matchbook/ts')
+const Array_ = require('fp-ts/Array')
+const Either = require('fp-ts/Either')
+const { identity: id, flow, pipe } = require('fp-ts/function')
 
-const parseSegmentLinuxUser = (o) =>
-  "linux_user" in o
-    ? "username" in o.linux_user
+const parseSegmentLinuxUser = o =>
+  'linux_user' in o
+    ? 'username' in o.linux_user
       ? Either.right({
           username: o.linux_user.username.trim(),
-          allowedSshPublicKeys: (o.allowed_ssh_public_keys || []).map(
-            (pubkey) => pubkey.trim()
+          allowedSshPublicKeys: (o.allowed_ssh_public_keys || []).map(pubkey =>
+            pubkey.trim(),
           ),
         })
-      : Either.left(new Error("linux_user.username required"))
-    : Either.left(new Error("linux_user required"));
+      : Either.left(new Error('linux_user.username required'))
+    : Either.left(new Error('linux_user required'))
 
 const parseSegmentPgAdmin = flow(
-  (o) =>
-    "pg_admin" in o
+  o =>
+    'pg_admin' in o
       ? Either.right(o.pg_admin)
       : Either.left(
           new Error(
-            ["pg_admin required", `in: ${JSON.stringify(o)}`].join("\n")
-          )
+            ['pg_admin required', `in: ${JSON.stringify(o)}`].join('\n'),
+          ),
         ),
-  Either.flatMap((pg) =>
-    "username" in pg
+  Either.flatMap(pg =>
+    'username' in pg
       ? Either.right(pg)
       : Either.left(
           new Error(
-            ["pg_admin.username required", `in: ${JSON.stringify(pg)}`].join(
-              "\n"
-            )
-          )
-        )
+            ['pg_admin.username required', `in: ${JSON.stringify(pg)}`].join(
+              '\n',
+            ),
+          ),
+        ),
   ),
-  Either.flatMap((pg) =>
-    "password" in pg
+  Either.flatMap(pg =>
+    'password' in pg
       ? Either.right(pg)
       : Either.left(
           new Error(
-            ["pg_admin.password required", `in: ${JSON.stringify(pg)}`].join(
-              "\n"
-            )
-          )
-        )
+            ['pg_admin.password required', `in: ${JSON.stringify(pg)}`].join(
+              '\n',
+            ),
+          ),
+        ),
   ),
-  Either.map((pg) => ({
+  Either.map(pg => ({
     username: pg.username.trim(),
     password: pg.password.trim(),
-  }))
-);
+  })),
+)
 
 const parseSegmentNetwork = flow(
-  (o) =>
-    "network" in o
+  o =>
+    'network' in o
       ? Either.right(o.network)
       : Either.left(
-          new Error(["network required", `in: ${JSON.stringify(o)}`].join("\n"))
+          new Error(
+            ['network required', `in: ${JSON.stringify(o)}`].join('\n'),
+          ),
         ),
-  Either.flatMap((n) =>
-    ("interface" in n && n.interface === "public") || n.interface === "local"
+  Either.flatMap(n =>
+    ('interface' in n && n.interface === 'public') || n.interface === 'local'
       ? Either.right(n)
       : Either.left(
           new Error(
             [
               "network.interface required, and must be 'public' or 'local'",
               `in: ${JSON.stringify(n)}`,
-            ].join("\n")
-          )
-        )
+            ].join('\n'),
+          ),
+        ),
   ),
-  Either.flatMap((n) =>
-    "port" in n && typeof n.port === "number" && Number.isInteger(n.port)
+  Either.flatMap(n =>
+    'port' in n && typeof n.port === 'number' && Number.isInteger(n.port)
       ? Either.right(n)
       : Either.left(
           new Error(
             [
-              "network.port required and must be an integer",
+              'network.port required and must be an integer',
               `in: ${JSON.stringify(n)}`,
-            ].join("\n")
-          )
-        )
+            ].join('\n'),
+          ),
+        ),
   ),
-  Either.flatMap((n) =>
-    n.interface === 'public' || (n.interface === "local" && !"domain" in n)
+  Either.flatMap(n =>
+    n.interface === 'public' || (n.interface === 'local' && !'domain' in n)
       ? Either.right(n)
       : Either.left(
           new Error(
             [
               "network.interface is 'local', network.domain must not be present.",
               `in: ${JSON.stringify(n)}`,
-            ].join("\n")
-          )
-        )
+            ].join('\n'),
+          ),
+        ),
   ),
-  Either.flatMap((n) =>
-    n.interface === 'public' && "domain" in n && typeof n.domain === "string" && n.domain.length > 0
+  Either.flatMap(n =>
+    n.interface === 'public' &&
+    'domain' in n &&
+    typeof n.domain === 'string' &&
+    n.domain.length > 0
       ? Either.right(n)
       : Either.left(
           new Error(
             [
               "network.interface is 'public', network.domain be set to a value.",
               `in: ${JSON.stringify(n)}`,
-            ].join("\n")
-          )
-        )
+            ].join('\n'),
+          ),
+        ),
   ),
-  Either.flatMap((n) =>
-    "ssl" in n && typeof n.ssl === "boolean"
+  Either.flatMap(n =>
+    'ssl' in n && typeof n.ssl === 'boolean'
       ? Either.right(n)
       : Either.left(
           new Error(
             [
-              "network.ssl required and must be a bool",
+              'network.ssl required and must be a bool',
               `in: ${JSON.stringify(n)}`,
-            ].join("\n")
-          )
-        )
+            ].join('\n'),
+          ),
+        ),
   ),
-  Either.map((n) => ({
+  Either.map(n => ({
     ssl: n.ssl,
-    domain: (n.domain || "").trim(),
+    domain: (n.domain || '').trim(),
     interface: n.interface,
     port: n.port,
-  }))
-);
+  })),
+)
 
-const parseServiceDb = (svc) =>
+const parseServiceDb = svc =>
   pipe(
     Either.Do,
-    Either.bind("linuxUser", () => parseSegmentLinuxUser(svc)),
-    Either.let("persist", () =>
-      (svc.persist || []).filter((s) => typeof s === "string" && s.length > 0)
+    Either.bind('linuxUser', () => parseSegmentLinuxUser(svc)),
+    Either.let('persist', () =>
+      (svc.persist || []).filter(s => typeof s === 'string' && s.length > 0),
     ),
-    Either.bind("network", () => parseSegmentNetwork(svc)),
-    Either.bind("pgAdmin", () => parseSegmentPgAdmin(svc))
-  );
+    Either.bind('network', () => parseSegmentNetwork(svc)),
+    Either.bind('pgAdmin', () => parseSegmentPgAdmin(svc)),
+  )
 
-const parseServiceApi = (svc) =>
+const parseServiceApi = svc =>
   pipe(
     Either.Do,
-    Either.bind("linuxUser", () => parseSegmentLinuxUser(svc)),
-    Either.let("persist", () =>
-      (svc.persist || []).filter((s) => typeof s === "string" && s.length > 0)
+    Either.bind('linuxUser', () => parseSegmentLinuxUser(svc)),
+    Either.let('persist', () =>
+      (svc.persist || []).filter(s => typeof s === 'string' && s.length > 0),
     ),
-    Either.bind("network", () => parseSegmentNetwork(svc))
-  );
+    Either.bind('network', () => parseSegmentNetwork(svc)),
+  )
 
-const parseServiceUi = (svc) =>
+const parseServiceUi = svc =>
   pipe(
     Either.Do,
-    Either.bind("linuxUser", () => parseSegmentLinuxUser(svc)),
-    Either.let("persist", () =>
-      (svc.persist || []).filter((s) => typeof s === "string" && s.length > 0)
+    Either.bind('linuxUser', () => parseSegmentLinuxUser(svc)),
+    Either.let('persist', () =>
+      (svc.persist || []).filter(s => typeof s === 'string' && s.length > 0),
     ),
-    Either.bind("network", () => parseSegmentNetwork(svc))
-  );
+    Either.bind('network', () => parseSegmentNetwork(svc)),
+  )
 
-const parseService = (svc) =>
-  "db" in svc
+const parseService = svc =>
+  'db' in svc
     ? parseServiceDb(svc.db)
-    : "api" in svc
+    : 'api' in svc
     ? parseServiceApi(svc.api)
-    : "ui" in svc
+    : 'ui' in svc
     ? parseServiceUi(svc.ui)
     : Either.left(
         new Error(
           [
             `top-level array elements must be records with a key named "db", "ui", or "api".`,
             `in: ${JSON.stringify(svc)}`,
-          ].join("\n")
-        )
-      );
+          ].join('\n'),
+        ),
+      )
 
-const ensureUniq = ({getWith, onConflict, isConflict}) => array => pipe(array,
-    Array_.map(getWith),
-    Array_.reduce(Either.right([]), (res, cur) =>
-      Either.flatMap(seen =>
-        isConflict(seen, cur)
-          ? Either.left(onConflict(cur))
-          : Either.right([...seen, cur])
-      )(res)
-    ),
-    Either.map(() => array)
-  );
+const ensureUniq =
+  ({ getWith, onConflict, isConflict }) =>
+  array =>
+    pipe(
+      array,
+      Array_.map(getWith),
+      Array_.reduce(Either.right([]), (res, cur) =>
+        Either.flatMap(seen =>
+          isConflict(seen, cur)
+            ? Either.left(onConflict(cur))
+            : Either.right([...seen, cur]),
+        )(res),
+      ),
+      Either.map(() => array),
+    )
 const ensureServicesDoNotOverlap = flow(
-  ensureUniq({getWith: s => s.linuxUser.username, onConflict: usr => new Error(`linux_user.username must be unique: ${usr}`), isConflict: (seen, cur) => seen.includes(cur)}),
-  Either.flatMap(ensureUniq({getWith: s => s.network.port, onConflict: port => new Error(`network.port must be unique: ${port}`), isConflict: (seen, cur) => seen.includes(cur)})),
-  Either.flatMap(ensureUniq({getWith: s => s.network.domain, onConflict: domain => new Error(`network.domain must be unique: ${domain}`), isConflict: (seen, cur) => seen.includes(cur)}))
-);
+  ensureUniq({
+    getWith: s => s.linuxUser.username,
+    onConflict: usr => new Error(`linux_user.username must be unique: ${usr}`),
+    isConflict: (seen, cur) => seen.includes(cur),
+  }),
+  Either.flatMap(
+    ensureUniq({
+      getWith: s => s.network.port,
+      onConflict: port => new Error(`network.port must be unique: ${port}`),
+      isConflict: (seen, cur) => seen.includes(cur),
+    }),
+  ),
+  Either.flatMap(
+    ensureUniq({
+      getWith: s => s.network.domain,
+      onConflict: domain =>
+        new Error(`network.domain must be unique: ${domain}`),
+      isConflict: (seen, cur) => seen.includes(cur),
+    }),
+  ),
+)
 
 const parse = flow(
-  (cfg) => Either.tryCatch(() => yaml.parse(cfg), id),
+  cfg => Either.tryCatch(() => yaml.parse(cfg), id),
   Either.filterOrElse(
-    (p) => p instanceof Array,
-    () => new Error("config must have top-level array elements")
+    p => p instanceof Array,
+    () => new Error('config must have top-level array elements'),
   ),
-  Either.flatMap((svcs) => Either.sequenceArray(svcs.map(parseService))),
-  Either.tap(ensureServicesDoNotOverlap)
-);
+  Either.flatMap(svcs => Either.sequenceArray(svcs.map(parseService))),
+  Either.tap(ensureServicesDoNotOverlap),
+)
 
-module.exports = { parse };
+module.exports = { parse }
diff --git a/src/index.js b/src/index.js
index dfed2b6..39ed27b 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,10 +1,7 @@
-const Config = require("./config.js");
-const Cmd = require("./cmd.js");
-const fs = require("fs");
-const {pipe} = require("fp-ts/function");
-const Either = require("fp-ts/Either");
+const Config = require('./config.js')
+const Cmd = require('./cmd.js')
+const fs = require('fs')
+const { pipe } = require('fp-ts/function')
+const Either = require('fp-ts/Either')
 
-pipe(
-  Cmd.run('cat ./config.example.yml'),
-  Either.flatMap(Config.parse),
-);
+pipe(Cmd.run('cat ./config.example.yml'), Either.flatMap(Config.parse))
diff --git a/yarn.lock b/yarn.lock
index 5f35f6d..1059c36 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -12,6 +12,11 @@ fp-ts@^2.16.0:
   resolved "https://registry.yarnpkg.com/fp-ts/-/fp-ts-2.16.0.tgz#64e03314dfc1c7ce5e975d3496ac14bc3eb7f92e"
   integrity sha512-bLq+KgbiXdTEoT1zcARrWEpa5z6A/8b7PcDW7Gef3NSisQ+VS7ll2Xbf1E+xsgik0rWub/8u0qP/iTTjj+PhxQ==
 
+prettier@^2.8.8:
+  version "2.8.8"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.8.8.tgz#e8c5d7e98a4305ffe3de2e1fc4aca1a71c28b1da"
+  integrity sha512-tdN8qQGvNjw4CHbY+XXk0JgCXn9QiF21a55rBe5LJAU+kDyC4WQn4+awm2Xfk2lQMk5fKup9XgzTZtGkjBdP9Q==
+
 yaml@^2.3.1:
   version "2.3.1"
   resolved "https://registry.yarnpkg.com/yaml/-/yaml-2.3.1.tgz#02fe0975d23cd441242aa7204e09fc28ac2ac33b"