diff --git a/.tool-versions b/.tool-versions
index 598836b..11affa2 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,3 +1,2 @@
-bun 1.0.11
-purescript 0.15.12
-nodejs 20.9.0
+bun 1.0.35
+purescript 0.15.15
diff --git a/bun.lockb b/bun.lockb
index c42d05c..8179e33 100755
Binary files a/bun.lockb and b/bun.lockb differ
diff --git a/package.json b/package.json
index e446309..c21954b 100644
--- a/package.json
+++ b/package.json
@@ -8,11 +8,12 @@
   },
   "devDependencies": {
     "bun-types": "1.0.11",
+    "postgres-range": "^1.1.4",
     "purs-tidy": "^0.10.0",
     "spago": "next"
   },
   "peerDependencies": {
     "typescript": "^5.0.0"
   },
-  "dependencies": {}
+  "dependencies": { "pg-types": "^4.0.2" }
 }
diff --git a/spago.lock b/spago.lock
new file mode 100644
index 0000000..1b9e047
--- /dev/null
+++ b/spago.lock
@@ -0,0 +1,877 @@
+workspace:
+  packages:
+    pg:
+      path: ./
+      dependencies:
+        - bifunctors
+        - control
+        - datetime
+        - effect
+        - exceptions
+        - foldable-traversable
+        - foreign
+        - lists
+        - maybe
+        - newtype
+        - node-buffer
+        - precise-datetime
+        - prelude
+        - transformers
+        - unsafe-coerce
+      test_dependencies:
+        - quickcheck
+        - spec
+        - spec-quickcheck
+      build_plan:
+        - aff
+        - ansi
+        - arraybuffer-types
+        - arrays
+        - avar
+        - bifunctors
+        - catenable-lists
+        - console
+        - const
+        - contravariant
+        - control
+        - datetime
+        - decimals
+        - distributive
+        - effect
+        - either
+        - enums
+        - exceptions
+        - exists
+        - fixed-points
+        - foldable-traversable
+        - foreign
+        - fork
+        - formatters
+        - free
+        - functions
+        - functors
+        - gen
+        - identity
+        - integers
+        - invariant
+        - js-date
+        - lazy
+        - lcg
+        - lists
+        - maybe
+        - mmorph
+        - newtype
+        - node-buffer
+        - nonempty
+        - now
+        - nullable
+        - numbers
+        - ordered-collections
+        - orders
+        - parallel
+        - parsing
+        - partial
+        - pipes
+        - precise-datetime
+        - prelude
+        - profunctor
+        - quickcheck
+        - random
+        - record
+        - refs
+        - safe-coerce
+        - spec
+        - spec-quickcheck
+        - st
+        - strings
+        - tailrec
+        - transformers
+        - tuples
+        - type-equality
+        - unfoldable
+        - unicode
+        - unsafe-coerce
+  extra_packages: {}
+packages:
+  aff:
+    type: registry
+    version: 7.1.0
+    integrity: sha256-7hOC6uQO9XBAI5FD8F33ChLjFAiZVfd4BJMqlMh7TNU=
+    dependencies:
+      - arrays
+      - bifunctors
+      - control
+      - datetime
+      - effect
+      - either
+      - exceptions
+      - foldable-traversable
+      - functions
+      - maybe
+      - newtype
+      - parallel
+      - prelude
+      - refs
+      - tailrec
+      - transformers
+      - unsafe-coerce
+  ansi:
+    type: registry
+    version: 7.0.0
+    integrity: sha256-ZMB6HD+q9CXvn9fRCmJ8dvuDrOVHcjombL3oNOerVnE=
+    dependencies:
+      - foldable-traversable
+      - lists
+      - strings
+  arraybuffer-types:
+    type: registry
+    version: 3.0.2
+    integrity: sha256-mQKokysYVkooS4uXbO+yovmV/s8b138Ws3zQvOwIHRA=
+    dependencies: []
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+    type: registry
+    version: 7.3.0
+    integrity: sha256-tmcklBlc/muUtUfr9RapdCPwnlQeB3aSrC4dK85gQlc=
+    dependencies:
+      - bifunctors
+      - control
+      - foldable-traversable
+      - functions
+      - maybe
+      - nonempty
+      - partial
+      - prelude
+      - safe-coerce
+      - st
+      - tailrec
+      - tuples
+      - unfoldable
+      - unsafe-coerce
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+    type: registry
+    version: 5.0.0
+    integrity: sha256-e7hf0x4hEpcygXP0LtvfvAQ49Bbj2aWtZT3gqM///0A=
+    dependencies:
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+      - effect
+      - either
+      - exceptions
+      - functions
+      - maybe
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+    type: registry
+    version: 6.0.0
+    integrity: sha256-/gZwC9YhNxZNQpnHa5BIYerCGM2jeX9ukZiEvYxm5Nw=
+    dependencies:
+      - const
+      - either
+      - newtype
+      - prelude
+      - tuples
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+    type: registry
+    version: 7.0.0
+    integrity: sha256-76vYENhwF4BWTBsjeLuErCH2jqVT4M3R1HX+4RwSftA=
+    dependencies:
+      - control
+      - foldable-traversable
+      - lists
+      - maybe
+      - prelude
+      - tuples
+      - unfoldable
+  console:
+    type: registry
+    version: 6.1.0
+    integrity: sha256-CxmAzjgyuGDmt9FZW51VhV6rBPwR6o0YeKUzA9rSzcM=
+    dependencies:
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+    type: registry
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+    integrity: sha256-tNrxDW8D8H4jdHE2HiPzpLy08zkzJMmGHdRqt5BQuTc=
+    dependencies:
+      - invariant
+      - newtype
+      - prelude
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+    version: 6.0.0
+    integrity: sha256-TP+ooAp3vvmdjfQsQJSichF5B4BPDHp3wAJoWchip6c=
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+      - prelude
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+    version: 6.1.0
+    integrity: sha256-g/5X5BBegQWLpI9IWD+sY6mcaYpzzlW5lz5NBzaMtyI=
+    dependencies:
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+      - control
+      - either
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+      - foldable-traversable
+      - functions
+      - gen
+      - integers
+      - lists
+      - maybe
+      - newtype
+      - numbers
+      - ordered-collections
+      - partial
+      - prelude
+      - tuples
+  decimals:
+    type: registry
+    version: 7.1.0
+    integrity: sha256-DriR6lPEfFpjVv7e4JAQkr3ZLf0h17Qg2cAIrhxWV7w=
+    dependencies:
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+    version: 6.0.0
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+    dependencies:
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+      - tuples
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+    integrity: sha256-eBtZu+HZcMa5HilvI6kaDyVX3ji8p0W9MGKy2K4T6+M=
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+    integrity: sha256-HWaD73JFLorc4A6trKIRUeDMdzE+GpkJaEOM1nTNkC8=
+    dependencies:
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+      - prelude
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+      - unfoldable
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+    type: registry
+    version: 6.0.0
+    integrity: sha256-y/xTAEIZIARCE+50/u1di0ncebJ+CIwNOLswyOWzMTw=
+    dependencies:
+      - effect
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+    type: registry
+    version: 6.0.0
+    integrity: sha256-A0JQHpTfo1dNOj9U5/Fd3xndlRSE0g2IQWOGor2yXn8=
+    dependencies:
+      - unsafe-coerce
+  fixed-points:
+    type: registry
+    version: 7.0.0
+    integrity: sha256-hTl5fzeG4mzAOFzEzAeNH7kJvJgYCH7x3v2NdX9pOE4=
+    dependencies:
+      - exists
+      - newtype
+      - prelude
+      - transformers
+  foldable-traversable:
+    type: registry
+    version: 6.0.0
+    integrity: sha256-fLeqRYM4jUrZD5H4WqcwUgzU7XfYkzO4zhgtNc3jcWM=
+    dependencies:
+      - bifunctors
+      - const
+      - control
+      - either
+      - functors
+      - identity
+      - maybe
+      - newtype
+      - orders
+      - prelude
+      - tuples
+  foreign:
+    type: registry
+    version: 7.0.0
+    integrity: sha256-1ORiqoS3HW+qfwSZAppHPWy4/6AQysxZ2t29jcdUMNA=
+    dependencies:
+      - either
+      - functions
+      - identity
+      - integers
+      - lists
+      - maybe
+      - prelude
+      - strings
+      - transformers
+  fork:
+    type: registry
+    version: 6.0.0
+    integrity: sha256-X7u0SuCvFbLbzuNEKLBNuWjmcroqMqit4xEzpQwAP7E=
+    dependencies:
+      - aff
+  formatters:
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+    version: 7.0.0
+    integrity: sha256-5JaC9d2p0xoqJWjWxlHH19R4iJwFTBr4j7SlYcLgicE=
+    dependencies:
+      - datetime
+      - fixed-points
+      - lists
+      - numbers
+      - parsing
+      - prelude
+      - transformers
+  free:
+    type: registry
+    version: 7.1.0
+    integrity: sha256-JAumgEsGSzJCNLD8AaFvuX7CpqS5yruCngi6yI7+V5k=
+    dependencies:
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+      - control
+      - distributive
+      - either
+      - exists
+      - foldable-traversable
+      - invariant
+      - lazy
+      - maybe
+      - prelude
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+      - transformers
+      - tuples
+      - unsafe-coerce
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+    type: registry
+    version: 6.0.0
+    integrity: sha256-adMyJNEnhGde2unHHAP79gPtlNjNqzgLB8arEOn9hLI=
+    dependencies:
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+    type: registry
+    version: 5.0.0
+    integrity: sha256-zfPWWYisbD84MqwpJSZFlvM6v86McM68ob8p9s27ywU=
+    dependencies:
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+      - const
+      - contravariant
+      - control
+      - distributive
+      - either
+      - invariant
+      - maybe
+      - newtype
+      - prelude
+      - profunctor
+      - tuples
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+    type: registry
+    version: 4.0.0
+    integrity: sha256-f7yzAXWwr+xnaqEOcvyO3ezKdoes8+WXWdXIHDBCAPI=
+    dependencies:
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+    integrity: sha256-sf+sK26R1hzwl3NhXR7WAu9zCDjQnfoXwcyGoseX158=
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+    integrity: sha256-RGWWyYrz0Hs1KjPDA+87Kia67ZFBhfJ5lMGOMCEFoLo=
+    dependencies:
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+      - integers
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+      - decimals
+      - either
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+      - foldable-traversable
+      - formatters
+      - integers
+      - js-date
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+    type: registry
+    version: 6.2.0
+    integrity: sha256-z9X0WsOUlPwNx9GlCC+YccCyz8MejC8Wb0C4+9fiBRY=
+    dependencies:
+      - partial
+      - prelude
+      - tailrec
+      - unsafe-coerce
+  strings:
+    type: registry
+    version: 6.0.1
+    integrity: sha256-WssD3DbX4OPzxSdjvRMX0yvc9+pS7n5gyPv5I2Trb7k=
+    dependencies:
+      - arrays
+      - control
+      - either
+      - enums
+      - foldable-traversable
+      - gen
+      - integers
+      - maybe
+      - newtype
+      - nonempty
+      - partial
+      - prelude
+      - tailrec
+      - tuples
+      - unfoldable
+      - unsafe-coerce
+  tailrec:
+    type: registry
+    version: 6.1.0
+    integrity: sha256-Xx19ECVDRrDWpz9D2GxQHHV89vd61dnXxQm0IcYQHGk=
+    dependencies:
+      - bifunctors
+      - effect
+      - either
+      - identity
+      - maybe
+      - partial
+      - prelude
+      - refs
+  transformers:
+    type: registry
+    version: 6.0.0
+    integrity: sha256-Pzw40HjthX77tdPAYzjx43LK3X5Bb7ZspYAp27wksFA=
+    dependencies:
+      - control
+      - distributive
+      - effect
+      - either
+      - exceptions
+      - foldable-traversable
+      - identity
+      - lazy
+      - maybe
+      - newtype
+      - prelude
+      - tailrec
+      - tuples
+      - unfoldable
+  tuples:
+    type: registry
+    version: 7.0.0
+    integrity: sha256-1rXgTomes9105BjgXqIw0FL6Fz1lqqUTLWOumhWec1M=
+    dependencies:
+      - control
+      - invariant
+      - prelude
+  type-equality:
+    type: registry
+    version: 4.0.1
+    integrity: sha256-Hs9D6Y71zFi/b+qu5NSbuadUQXe5iv5iWx0226vOHUw=
+    dependencies: []
+  unfoldable:
+    type: registry
+    version: 6.0.0
+    integrity: sha256-JtikvJdktRap7vr/K4ITlxUX1QexpnqBq0G/InLr6eg=
+    dependencies:
+      - foldable-traversable
+      - maybe
+      - partial
+      - prelude
+      - tuples
+  unicode:
+    type: registry
+    version: 6.0.0
+    integrity: sha256-QJnTVZpmihEAUiMeYrfkusVoziJWp2hJsgi9bMQLue8=
+    dependencies:
+      - foldable-traversable
+      - maybe
+      - strings
+  unsafe-coerce:
+    type: registry
+    version: 6.0.0
+    integrity: sha256-IqIYW4Vkevn8sI+6aUwRGvd87tVL36BBeOr0cGAE7t0=
+    dependencies: []
diff --git a/spago.yaml b/spago.yaml
index c5aa839..c7cd20c 100644
--- a/spago.yaml
+++ b/spago.yaml
@@ -1,24 +1,31 @@
 package:
+  name: pg
   build:
     strict: true
     pedantic_packages: true
   dependencies:
-    - prelude
-    - aff
+    - bifunctors
+    - control
+    - datetime
     - effect
-    - either
-    - maybe
+    - exceptions
     - foldable-traversable
-    - console
+    - foreign
+    - lists
+    - maybe
     - newtype
-    - strings
-    - stringutils
+    - node-buffer
+    - precise-datetime
+    - prelude
     - transformers
-    - tuples
-    - typelevel-prelude
-  name: project
+    - unsafe-coerce
+  test:
+    main: Test.Main
+    dependencies:
+      - quickcheck
+      - spec
+      - spec-quickcheck
 workspace:
   extra_packages: {}
-  package_set:
-    url: https://raw.githubusercontent.com/purescript/package-sets/psc-0.15.10-20230930/packages.json
-    hash: sha256-nTsd44o7/hrTdk0c6dh0wyBqhFFDJJIeKdQU6L1zv/A=
+  packageSet:
+    registry: 50.5.0
diff --git a/src/Data.Postgres.Geometry.purs b/src/Data.Postgres.Geometry.purs
new file mode 100644
index 0000000..f37de52
--- /dev/null
+++ b/src/Data.Postgres.Geometry.purs
@@ -0,0 +1,23 @@
+module Data.Postgres.Geometry where
+
+import Prelude
+
+import Data.Generic.Rep (class Generic)
+import Data.Newtype (class Newtype)
+import Data.Show.Generic (genericShow)
+
+newtype Point = Point { x :: Number, y :: Number }
+
+derive instance Newtype Point _
+derive instance Generic Point _
+derive instance Eq Point
+instance Show Point where
+  show = genericShow
+
+newtype Circle = Circle { center :: Point, radius :: Number }
+
+derive instance Newtype Circle _
+derive instance Generic Circle _
+derive instance Eq Circle
+instance Show Circle where
+  show = genericShow
diff --git a/src/Data.Postgres.Range.js b/src/Data.Postgres.Range.js
new file mode 100644
index 0000000..31140be
--- /dev/null
+++ b/src/Data.Postgres.Range.js
@@ -0,0 +1,71 @@
+import * as Range from 'postgres-range'
+
+/**
+ * @template T
+ * @typedef {{upper: T | undefined, lower: T | undefined, lowerIncl: boolean, upperIncl: boolean}} RangeRawRecord
+ */
+
+/** @type {<T>(_: Range.Range<T>) => RangeRawRecord<T>} */
+export const rangeRawToRecord = r => {
+  if (r.hasMask(Range.RANGE_EMPTY)) {
+    return {
+      upper: undefined,
+      lower: undefined,
+      lowerIncl: false,
+      upperIncl: false,
+    }
+  } else {
+    const upper = r.upper === null ? undefined : r.upper
+    const lower = r.lower === null ? undefined : r.lower
+    return {
+      upper: r.hasMask(Range.RANGE_UB_INF) ? undefined : upper,
+      lower: r.hasMask(Range.RANGE_LB_INF) ? undefined : lower,
+      lowerIncl: r.hasMask(Range.RANGE_LB_INC),
+      upperIncl: r.hasMask(Range.RANGE_UB_INC),
+    }
+  }
+}
+
+/** @type {<T>(_: RangeRawRecord<T>) => Range.Range<T>} */
+export const rangeRawFromRecord = r => {
+  const upper = r.upper === undefined ? null : r.upper
+  const lower = r.lower === undefined ? null : r.lower
+  if (upper === null && lower === null) {
+    // @ts-ignore
+    return new Range.Range(lower, upper, Range.RANGE_EMPTY)
+  }
+
+  let mask = 0
+  if (upper === null) {
+    mask |= Range.RANGE_UB_INF
+  } else if (r.upperIncl) {
+    mask |= Range.RANGE_UB_INC
+  }
+
+  if (lower === null) {
+    mask |= Range.RANGE_LB_INF
+  } else if (r.lowerIncl) {
+    mask |= Range.RANGE_LB_INC
+  }
+
+  return new Range.Range(lower, upper, mask)
+}
+
+/** @type {<T>(r: Range.Range<T>) => () => string} */
+export const rangeRawSerialize = r => () => {
+  return Range.serialize(r)
+}
+
+/** @type {<T>(r: string) => (f: (s: string) => () => T) => () => Range.Range<T>} */
+export const rangeRawParse = r => f => () => {
+  return Range.parse(r, s => f(s)())
+}
+
+/** @type {(r: unknown) => () => Range.Range<unknown>} */
+export const readRangeRaw = r => () => {
+  if (r instanceof Range.Range) {
+    return r
+  } else {
+    throw new TypeError(`expected instance of Range, found ${r}`)
+  }
+}
diff --git a/src/Data.Postgres.Range.purs b/src/Data.Postgres.Range.purs
new file mode 100644
index 0000000..64d5c93
--- /dev/null
+++ b/src/Data.Postgres.Range.purs
@@ -0,0 +1,122 @@
+module Data.Postgres.Range where
+
+import Prelude
+
+import Control.Alt ((<|>))
+import Control.Monad.Trans.Class (lift)
+import Data.Generic.Rep (class Generic)
+import Data.Maybe (Maybe(..), fromMaybe)
+import Data.Newtype (class Newtype, unwrap)
+import Data.Postgres (class Deserialize, class Rep, class Serialize, RepT, deserialize, serialize, smash)
+import Data.Postgres.Raw (Raw)
+import Data.Postgres.Raw as Raw
+import Data.Show.Generic (genericShow)
+import Effect (Effect)
+import Foreign (unsafeToForeign)
+
+type RangeRawRecord = { upper :: Raw, lower :: Raw, lowerIncl :: Boolean, upperIncl :: Boolean }
+
+foreign import data RangeRaw :: Type
+foreign import readRangeRaw :: Raw -> Effect RangeRaw
+foreign import rangeRawToRecord :: RangeRaw -> RangeRawRecord
+foreign import rangeRawFromRecord :: RangeRawRecord -> RangeRaw
+foreign import rangeRawParse :: String -> (String -> Effect Raw) -> Effect RangeRaw
+foreign import rangeRawSerialize :: RangeRaw -> Effect String
+
+rangeFromRaw :: forall a. Deserialize a => RangeRawRecord -> RepT (Range a)
+rangeFromRaw raw = do
+  upper' :: Maybe a <- deserialize raw.upper
+  lower' :: Maybe a <- deserialize raw.lower
+  pure $ Range { upper: makeBound raw.upperIncl <$> upper', lower: makeBound raw.lowerIncl <$> lower' }
+
+rangeToRaw :: forall a. Serialize a => Range a -> RepT RangeRawRecord
+rangeToRaw r = do
+  upper' <- serialize $ boundValue <$> upper r
+  lower' <- serialize $ boundValue <$> lower r
+  pure $ { upper: upper', lower: lower', upperIncl: fromMaybe false $ boundIsInclusive <$> upper r, lowerIncl: fromMaybe false $ boundIsInclusive <$> lower r }
+
+data Bound a = BoundIncl a | BoundExcl a
+
+derive instance Generic (Bound a) _
+derive instance Eq a => Eq (Bound a)
+instance Show a => Show (Bound a) where
+  show = genericShow
+
+boundValue :: forall a. Bound a -> a
+boundValue (BoundIncl a) = a
+boundValue (BoundExcl a) = a
+
+boundIsInclusive :: forall a. Bound a -> Boolean
+boundIsInclusive (BoundIncl _) = true
+boundIsInclusive (BoundExcl _) = false
+
+upper :: forall a. Range a -> Maybe (Bound a)
+upper = _.upper <<< unwrap
+
+lower :: forall a. Range a -> Maybe (Bound a)
+lower = _.lower <<< unwrap
+
+makeBound :: forall a. Boolean -> a -> Bound a
+makeBound i a
+  | i = BoundIncl a
+  | otherwise = BoundExcl a
+
+newtype Range a = Range { upper :: Maybe (Bound a), lower :: Maybe (Bound a) }
+
+derive instance Generic (Range a) _
+derive instance Newtype (Range a) _
+derive instance Eq a => Eq (Range a)
+instance Show a => Show (Range a) where
+  show = genericShow
+
+instance (Ord a, Rep a) => Serialize (Range a) where
+  serialize a = do
+    raw <- rangeToRaw a
+    pure $ Raw.unsafeFromForeign $ unsafeToForeign $ rangeRawFromRecord raw
+
+instance (Ord a, Rep a) => Deserialize (Range a) where
+  deserialize raw = do
+    range :: RangeRaw <- lift $ readRangeRaw raw
+    rangeFromRaw $ rangeRawToRecord range
+
+instance Monoid (Range a) where
+  mempty = Range { upper: Nothing, lower: Nothing }
+
+instance Semigroup (Range a) where
+  append (Range { upper: au, lower: al }) (Range { upper: bu, lower: bl }) = Range ({ upper: bu <|> au, lower: bl <|> al })
+
+parseSQL :: forall a. Rep a => (String -> RepT a) -> String -> RepT (Range a)
+parseSQL fromString sql = do
+  range <- lift $ rangeRawParse sql $ smash <<< (serialize <=< fromString)
+  rangeFromRaw $ rangeRawToRecord range
+
+printSQL :: forall a. Rep a => Range a -> RepT String
+printSQL range = do
+  record <- rangeToRaw range
+  lift $ rangeRawSerialize $ rangeRawFromRecord record
+
+contains :: forall a. Ord a => a -> Range a -> Boolean
+contains a r =
+  let
+    upperOk
+      | Just (BoundIncl u) <- upper r = u >= a
+      | Just (BoundExcl u) <- upper r = u > a
+      | otherwise = true
+    lowerOk
+      | Just (BoundIncl u) <- lower r = u <= a
+      | Just (BoundExcl u) <- lower r = u < a
+      | otherwise = true
+  in
+    upperOk && lowerOk
+
+gte :: forall a. Ord a => a -> Range a
+gte a = Range { upper: Just $ BoundIncl a, lower: Nothing }
+
+gt :: forall a. Ord a => a -> Range a
+gt a = Range { upper: Just $ BoundExcl a, lower: Nothing }
+
+lt :: forall a. Ord a => a -> Range a
+lt a = Range { upper: Nothing, lower: Just $ BoundExcl a }
+
+lte :: forall a. Ord a => a -> Range a
+lte a = Range { upper: Nothing, lower: Just $ BoundIncl a }
diff --git a/src/Data.Postgres.Raw.js b/src/Data.Postgres.Raw.js
new file mode 100644
index 0000000..7acd4fe
--- /dev/null
+++ b/src/Data.Postgres.Raw.js
@@ -0,0 +1,30 @@
+/** @type {(raw: unknown) => string} */
+export const rawToString = raw =>
+  typeof raw === 'undefined'
+    ? 'undefined'
+    : typeof raw === 'string'
+      ? raw
+      : typeof raw === 'number' ||
+          typeof raw === 'boolean' ||
+          typeof raw === 'symbol'
+        ? raw.toString()
+        : typeof raw === 'object'
+          ? raw === null
+            ? 'null'
+            : `[${raw.constructor.name}]`
+          : 'unknown'
+
+/** @type {(a: unknown) => (b: unknown) => boolean} */
+export const rawEq = a => b =>
+  typeof a === 'undefined' && typeof b === 'undefined'
+    ? true
+    : typeof a === typeof b &&
+        ['number', 'boolean', 'symbol', 'string'].includes(typeof a)
+      ? a === b
+      : typeof a === 'object' && typeof b === 'object'
+        ? a === null && b === null
+          ? true
+          : a instanceof Array && b instanceof Array
+            ? a.every((a_, ix) => rawEq(a_)(b[ix]))
+            : false
+        : false
diff --git a/src/Data.Postgres.Raw.purs b/src/Data.Postgres.Raw.purs
new file mode 100644
index 0000000..990649a
--- /dev/null
+++ b/src/Data.Postgres.Raw.purs
@@ -0,0 +1,22 @@
+module Data.Postgres.Raw where
+
+import Prelude
+
+import Foreign (Foreign)
+import Unsafe.Coerce (unsafeCoerce)
+
+foreign import data Raw :: Type
+foreign import rawToString :: Raw -> String
+foreign import rawEq :: Raw -> Raw -> Boolean
+
+instance Show Raw where
+  show = rawToString
+
+instance Eq Raw where
+  eq = rawEq
+
+unsafeFromForeign :: Foreign -> Raw
+unsafeFromForeign = unsafeCoerce
+
+unsafeToForeign :: Raw -> Foreign
+unsafeToForeign = unsafeCoerce
diff --git a/src/Data.Postgres.js b/src/Data.Postgres.js
new file mode 100644
index 0000000..a833d11
--- /dev/null
+++ b/src/Data.Postgres.js
@@ -0,0 +1,37 @@
+import { getTypeParser, setTypeParser } from 'pg-types'
+import * as Range from 'postgres-range'
+
+export const null_ = null
+
+export const modifyPgTypes = () => {
+  const oid = {
+    'text[]': 1009,
+    json: 114,
+    jsonb: 3802,
+    'json[]': 199,
+    'jsonb[]': 3807,
+    timestamp: 1114,
+    timestamptz: 1184,
+    'timestamp[]': 1115,
+    'timestamptz[]': 1185,
+    tsrange: 3908,
+    tstzrange: 3910,
+  }
+
+  // @ts-ignore
+  const asString = a => a
+  const asStringArray = getTypeParser(oid['text[]'])
+  const asStringRange = Range.parse
+
+  setTypeParser(oid['json'], asString)
+  setTypeParser(oid['jsonb'], asString)
+  setTypeParser(oid['json[]'], asStringArray)
+  setTypeParser(oid['jsonb[]'], asStringArray)
+
+  setTypeParser(oid['timestamp'], asString)
+  setTypeParser(oid['timestamptz'], asString)
+  setTypeParser(oid['timestamp[]'], asStringArray)
+  setTypeParser(oid['timestamptz[]'], asStringArray)
+  setTypeParser(oid['tsrange'], asStringRange)
+  setTypeParser(oid['tstzrange'], asStringRange)
+}
diff --git a/src/Data.Postgres.purs b/src/Data.Postgres.purs
new file mode 100644
index 0000000..75e9fbc
--- /dev/null
+++ b/src/Data.Postgres.purs
@@ -0,0 +1,167 @@
+module Data.Postgres where
+
+import Prelude
+
+import Control.Alt ((<|>))
+import Control.Monad.Error.Class (liftEither, liftMaybe)
+import Control.Monad.Except (Except, ExceptT, except, runExcept, runExceptT, withExceptT)
+import Data.Bifunctor (lmap)
+import Data.DateTime (DateTime)
+import Data.Generic.Rep (class Generic)
+import Data.List.NonEmpty (NonEmptyList)
+import Data.Maybe (Maybe(..))
+import Data.Newtype (unwrap, wrap)
+import Data.Postgres.Raw (Raw)
+import Data.Postgres.Raw (unsafeFromForeign, unsafeToForeign) as Raw
+import Data.RFC3339String as DateTime.ISO
+import Data.Show.Generic (genericShow)
+import Data.Traversable (traverse)
+import Effect (Effect)
+import Effect.Exception (error)
+import Foreign (ForeignError)
+import Foreign as F
+import Node.Buffer (Buffer)
+
+newtype JSON = JSON String
+
+foreign import null_ :: Raw
+
+-- | Important! This effect MUST be evaluated to guarantee
+-- | that (de)serialization will work for timestamp and JSON types.
+-- |
+-- | This mutates the `pg-types`, overriding the default deserialization
+-- | behavior for JSON and timestamp types.
+foreign import modifyPgTypes :: Effect Unit
+
+-- | The SQL value NULL
+data Null = Null
+
+derive instance Generic Null _
+derive instance Eq Null
+derive instance Ord Null
+instance Show Null where
+  show = genericShow
+
+-- | The serialization & deserialization monad.
+type RepT a = ExceptT RepError Effect a
+
+-- | Errors encounterable while serializing & deserializing.
+data RepError
+  = RepErrorTypeMismatch { expected :: String, found :: String }
+  | RepErrorInvalid String
+  | RepErrorForeign ForeignError
+  | RepErrorOther String
+  | RepErrorMultiple (NonEmptyList RepError)
+
+derive instance Generic RepError _
+derive instance Eq RepError
+instance Show RepError where
+  show a = genericShow a
+
+instance Semigroup RepError where
+  append (RepErrorMultiple as) (RepErrorMultiple bs) = RepErrorMultiple (as <> bs)
+  append (RepErrorMultiple as) b = RepErrorMultiple (as <> pure b)
+  append a (RepErrorMultiple bs) = RepErrorMultiple (pure a <> bs)
+  append a b = RepErrorMultiple (pure a <> pure b)
+
+-- | Flatten to an Effect, rendering any `RepError`s to `String` using `Show`.
+smash :: forall a. RepT a -> Effect a
+smash = liftEither <=< map (lmap (error <<< show)) <<< runExceptT
+
+-- | Lift an `Except` returned by functions in the `Foreign` module to `RepT`
+liftForeign :: forall a. Except (NonEmptyList ForeignError) a -> RepT a
+liftForeign = except <<< runExcept <<< withExceptT (RepErrorMultiple <<< map RepErrorForeign)
+
+-- | Serialize data of type `a` to a `Raw` SQL value.
+class Serialize a where
+  serialize :: a -> RepT Raw
+
+-- | Deserialize data of type `a` from a `Raw` SQL value.
+class Deserialize a where
+  deserialize :: Raw -> RepT a
+
+-- | A type which is `Rep`resentable as a SQL value.
+class (Serialize a, Deserialize a) <= Rep a
+
+instance (Serialize a, Deserialize a) => Rep a
+
+-- | Coerces the value to `Raw`
+unsafeSerializeCoerce :: forall m a. Monad m => a -> m Raw
+unsafeSerializeCoerce = pure <<< Raw.unsafeFromForeign <<< F.unsafeToForeign
+
+instance Serialize Raw where
+  serialize = pure
+
+instance Serialize Null where
+  serialize _ = unsafeSerializeCoerce null_
+
+-- | `bytea`
+instance Serialize Buffer where
+  serialize = unsafeSerializeCoerce
+
+instance Serialize Int where
+  serialize = unsafeSerializeCoerce
+
+instance Serialize Boolean where
+  serialize = unsafeSerializeCoerce
+
+instance Serialize String where
+  serialize = unsafeSerializeCoerce
+
+instance Serialize Number where
+  serialize = unsafeSerializeCoerce
+
+instance Serialize Char where
+  serialize = unsafeSerializeCoerce
+
+instance Serialize DateTime where
+  serialize = serialize <<< unwrap <<< DateTime.ISO.fromDateTime
+
+instance Serialize a => Serialize (Maybe a) where
+  serialize (Just a) = serialize a
+  serialize Nothing = unsafeSerializeCoerce null_
+
+instance Serialize a => Serialize (Array a) where
+  serialize = unsafeSerializeCoerce <=< traverse serialize
+
+instance Deserialize Raw where
+  deserialize = pure
+
+-- | `bytea`
+instance Deserialize Buffer where
+  deserialize = liftForeign <<< (F.unsafeReadTagged "Buffer") <<< Raw.unsafeToForeign
+
+instance Deserialize Null where
+  deserialize = map (const Null) <<< liftForeign <<< F.readNullOrUndefined <<< Raw.unsafeToForeign
+
+instance Deserialize Int where
+  deserialize = liftForeign <<< F.readInt <<< Raw.unsafeToForeign
+
+instance Deserialize Boolean where
+  deserialize = liftForeign <<< F.readBoolean <<< Raw.unsafeToForeign
+
+instance Deserialize String where
+  deserialize = liftForeign <<< F.readString <<< Raw.unsafeToForeign
+
+instance Deserialize Number where
+  deserialize = liftForeign <<< F.readNumber <<< Raw.unsafeToForeign
+
+instance Deserialize Char where
+  deserialize = liftForeign <<< F.readChar <<< Raw.unsafeToForeign
+
+instance Deserialize DateTime where
+  deserialize raw = do
+    s :: String <- deserialize raw
+    let invalid = RepErrorInvalid $ "Not a valid ISO8601 string: `" <> s <> "`"
+    liftMaybe invalid $ DateTime.ISO.toDateTime $ wrap s
+
+instance Deserialize a => Deserialize (Array a) where
+  deserialize = traverse (deserialize <<< Raw.unsafeFromForeign) <=< liftForeign <<< F.readArray <<< Raw.unsafeToForeign
+
+instance Deserialize a => Deserialize (Maybe a) where
+  deserialize raw =
+    let
+      nothing = const Nothing <$> deserialize @Null raw
+      just = Just <$> deserialize raw
+    in
+      just <|> nothing
diff --git a/src/Effect.Postgres.purs b/src/Effect.Postgres.purs
new file mode 100644
index 0000000..81762a7
--- /dev/null
+++ b/src/Effect.Postgres.purs
@@ -0,0 +1,4 @@
+module Effect.Pg where
+
+import Prelude
+
diff --git a/src/Main.purs b/src/Main.purs
deleted file mode 100644
index ee561ac..0000000
--- a/src/Main.purs
+++ /dev/null
@@ -1,7 +0,0 @@
-module Main where
-
-import Prelude
-import Effect (Effect)
-
-main :: Effect Unit
-main = pure unit
diff --git a/test/Test.Data.Postgres.purs b/test/Test.Data.Postgres.purs
new file mode 100644
index 0000000..2a1858f
--- /dev/null
+++ b/test/Test.Data.Postgres.purs
@@ -0,0 +1,74 @@
+module Test.Data.Postgres where
+
+import Prelude
+
+import Control.Monad.Error.Class (liftEither)
+import Control.Monad.Except (runExceptT)
+import Data.DateTime (DateTime(..))
+import Data.DateTime.Instant as Instant
+import Data.Int as Int
+import Data.Maybe (Maybe, fromJust, fromMaybe, maybe)
+import Data.Newtype (wrap)
+import Data.Postgres (class Rep, Null(..), deserialize, null_, serialize, smash)
+import Data.Postgres.Range as Range
+import Data.Postgres.Raw (Raw)
+import Data.Postgres.Raw as Raw
+import Data.RFC3339String as DateTime.ISO
+import Data.Tuple.Nested (type (/\), (/\))
+import Effect.Class (liftEffect)
+import Effect.Console (log)
+import Effect.Unsafe (unsafePerformEffect)
+import Foreign (unsafeToForeign)
+import Partial.Unsafe (unsafePartial)
+import Test.QuickCheck (class Arbitrary, (==?))
+import Test.Spec (Spec, describe, it)
+import Test.Spec.Assertions (shouldEqual)
+import Test.Spec.QuickCheck (quickCheck)
+
+asRaw :: forall a. a -> Raw
+asRaw = Raw.unsafeFromForeign <<< unsafeToForeign
+
+spec :: Spec Unit
+spec =
+  let
+    check :: forall @a @x. Eq a => Show a => Arbitrary x => Rep a => String -> (x -> a) -> (a -> Raw) -> Spec Unit
+    check s xa asRaw_ =
+      describe s do
+        it "serialize" $ quickCheck \(x :: x) -> (unsafePerformEffect $ runExceptT $ serialize $ xa x) ==? pure (asRaw_ $ xa x)
+        it "deserialize" $ quickCheck \(x :: x) -> (unsafePerformEffect $ runExceptT $ deserialize $ asRaw_ $ xa x) ==? pure (xa x)
+
+    check_ :: forall @a. Eq a => Show a => Arbitrary a => Rep a => String -> Spec Unit
+    check_ s = check @a @a s identity asRaw
+
+    dateTimeFromArbitrary :: Int -> DateTime
+    dateTimeFromArbitrary = Instant.toDateTime <<< unsafePartial fromJust <<< Instant.instant <<< wrap <<< Int.toNumber
+  in
+    describe "Data.Postgres" do
+      check_ @Int "Int"
+      check_ @String "String"
+      check_ @Boolean "Boolean"
+      check_ @Number "Number"
+      check_ @Char "Char"
+
+      check @(Maybe String) "Maybe String" identity (maybe null_ asRaw)
+      check @(Array String) "Array String" identity asRaw
+      check @DateTime "DateTime" dateTimeFromArbitrary (asRaw <<< DateTime.ISO.fromDateTime)
+
+      describe "Null" do
+        it "serialize" $ liftEffect $ shouldEqual null_ =<< (smash $ serialize Null)
+        it "deserialize" $ liftEffect $ shouldEqual Null =<< (smash $ deserialize null_)
+
+      describe "Range" do
+        it "deserialize" do
+          quickCheck \(up /\ lo /\ uinc /\ linc :: Int /\ Int /\ Boolean /\ Boolean) -> unsafePerformEffect do
+            let
+              record =
+                { upper: unsafePerformEffect $ smash $ serialize up
+                , lower: unsafePerformEffect $ smash $ serialize lo
+                , upperIncl: uinc
+                , lowerIncl: linc
+                }
+              raw = asRaw $ Range.rangeRawFromRecord record
+            exp :: Range.Range Int <- smash $ Range.rangeFromRaw record
+            act :: Range.Range Int <- smash $ deserialize raw
+            pure $ exp ==? act
diff --git a/test/Test.Main.purs b/test/Test.Main.purs
new file mode 100644
index 0000000..5f5fd3d
--- /dev/null
+++ b/test/Test.Main.purs
@@ -0,0 +1,13 @@
+module Test.Main where
+
+import Prelude
+
+import Effect (Effect)
+import Effect.Aff (launchAff_)
+import Test.Data.Postgres as Test.Data.Postgres
+import Test.Spec.Reporter (consoleReporter)
+import Test.Spec.Runner (runSpec)
+
+main :: Effect Unit
+main = launchAff_ $ runSpec [ consoleReporter ] do
+  Test.Data.Postgres.spec