diff --git a/__fixtures__/generated/generated.json b/__fixtures__/generated/generated.json
index e5815db1..a2a04ff9 100644
--- a/__fixtures__/generated/generated.json
+++ b/__fixtures__/generated/generated.json
@@ -53,6 +53,13 @@
   "pretty/selects-13.sql": "SELECT\n  id,\n  name\nFROM users\nWHERE\n  id IN (SELECT\n  user_id\nFROM orders\nWHERE\n  total > 100)",
   "pretty/selects-14.sql": "SELECT\n  id,\n  name,\n  email\nFROM users\nWHERE\n  active = true",
   "pretty/selects-15.sql": "SELECT\n  u.id,\n  u.name,\n  u.email,\n  p.title\nFROM users AS u\nJOIN profiles AS p ON u.id = p.user_id\nWHERE\n  u.active = true\n  AND u.created_at > '2023-01-01'\nGROUP BY\n  u.id,\n  u.name,\n  u.email,\n  p.title\nHAVING\n  count(*) > 1\nORDER BY\n  u.created_at DESC,\n  u.name ASC\nLIMIT 10\nOFFSET 5",
+  "pretty/quoting-1.sql": "CREATE FUNCTION faker.float(min double precision DEFAULT 0, max double precision DEFAULT 100) RETURNS double precision AS $EOFCODE$\nBEGIN\n  RETURN min + random() * (max - min);\nEND;\n$EOFCODE$ LANGUAGE plpgsql",
+  "pretty/quoting-2.sql": "CREATE FUNCTION faker.\"float\"(min double precision DEFAULT 0, max double precision DEFAULT 100) RETURNS double precision AS $EOFCODE$\nBEGIN\n  RETURN min + random() * (max - min);\nEND;\n$EOFCODE$ LANGUAGE plpgsql",
+  "pretty/quoting-3.sql": "CREATE FUNCTION faker.interval(min int, max int) RETURNS interval AS $EOFCODE$\nBEGIN\n  RETURN make_interval(secs => (min + floor(random() * (max - min + 1)))::int);\nEND;\n$EOFCODE$ LANGUAGE plpgsql",
+  "pretty/quoting-4.sql": "CREATE FUNCTION faker.\"interval\"(min int, max int) RETURNS interval AS $EOFCODE$\nBEGIN\n  RETURN make_interval(secs => (min + floor(random() * (max - min + 1)))::int);\nEND;\n$EOFCODE$ LANGUAGE plpgsql",
+  "pretty/quoting-5.sql": "CREATE FUNCTION faker.boolean() RETURNS boolean AS $EOFCODE$\nBEGIN\n  RETURN random() < 0.5;\nEND;\n$EOFCODE$ LANGUAGE plpgsql",
+  "pretty/quoting-6.sql": "CREATE FUNCTION faker.\"boolean\"() RETURNS boolean AS $EOFCODE$\nBEGIN\n  RETURN random() < 0.5;\nEND;\n$EOFCODE$ LANGUAGE plpgsql",
+  "pretty/quoting-7.sql": "CREATE DOMAIN origin AS text CHECK (value = pg_catalog.\"substring\"(value, '^(https?://[^/]*)'))",
   "pretty/procedures-1.sql": "SELECT handle_insert('TYPE_A')",
   "pretty/procedures-2.sql": "SELECT \"HandleInsert\"('TYPE_A', 'Region-1')",
   "pretty/procedures-3.sql": "SELECT compute_score(42, TRUE)",
@@ -80,6 +87,15 @@
   "pretty/misc-15.sql": "ALTER DEFAULT PRIVILEGES IN SCHEMA dashboard_jobs \n GRANT EXECUTE ON FUNCTIONS  TO administrator",
   "pretty/misc-16.sql": "GRANT EXECUTE ON FUNCTION dashboard_private.uuid_generate_seeded_uuid TO PUBLIC",
   "pretty/misc-17.sql": "SELECT CAST(t.date AT TIME ZONE $$America/New_York$$ AS text)::date FROM tbl t",
+  "pretty/formatting-1.sql": "EXPLAIN (COSTS OFF) SELECT * FROM onek2 WHERE unique2 = 11 AND stringu1 = 'ATAAAA'",
+  "pretty/formatting-2.sql": "EXPLAIN SELECT * FROM onek2 WHERE unique2 = 11 AND stringu1 = 'ATAAAA'",
+  "pretty/formatting-3.sql": "INSERT INTO objects.object (name, val, active, hash)\nVALUES ('name', 'val', 't'::boolean, 'abcdefg'),\n       ('name', 'val', 't'::boolean, 'abcdefg'),\n       ('name', 'val', 't'::boolean, 'abcdefg')",
+  "pretty/formatting-4.sql": "INSERT INTO objects.object (name, val, active, hash)\nVALUES ('name', 'val', TRUE, 'abcdefg'),\n       ('name', 'val', TRUE, 'abcdefg'),\n       ('name', 'val', TRUE, 'abcdefg')",
+  "pretty/formatting-5.sql": "INSERT INTO objects.object (name, val, active, hash)\nVALUES ('name', 'val', FALSE, 'abcdefg')",
+  "pretty/formatting-6.sql": "INSERT INTO objects.object (name, val, active, hash)\nVALUES ('name', 'val', 'f'::boolean, 'abcdefg')",
+  "pretty/formatting-7.sql": "CREATE FUNCTION test_func(IN p1 pos_int) RETURNS void AS $$ BEGIN NULL; END; $$ LANGUAGE plpgsql",
+  "pretty/formatting-8.sql": "CREATE FUNCTION test_func2(IN p1 pos_int, IN p2 text) RETURNS void AS $$ BEGIN NULL; END; $$ LANGUAGE plpgsql",
+  "pretty/formatting-9.sql": "CREATE FUNCTION test_func3(IN p1 integer, OUT p2 text, INOUT p3 boolean) RETURNS record AS $$ BEGIN p2 := 'test'; END; $$ LANGUAGE plpgsql",
   "pretty/cte-1.sql": "WITH regional_sales AS (SELECT region, SUM(sales_amount) as total_sales FROM sales GROUP BY region) SELECT * FROM regional_sales",
   "pretty/cte-2.sql": "WITH regional_sales AS (SELECT region, SUM(sales_amount) as total_sales FROM sales GROUP BY region), top_regions AS (SELECT region FROM regional_sales WHERE total_sales > 1000000) SELECT * FROM top_regions",
   "pretty/cte-3.sql": "WITH RECURSIVE employee_hierarchy AS (SELECT id, name, manager_id, 1 as level FROM employees WHERE manager_id IS NULL UNION ALL SELECT e.id, e.name, e.manager_id, eh.level + 1 FROM employees e JOIN employee_hierarchy eh ON e.manager_id = eh.id) SELECT * FROM employee_hierarchy",
diff --git a/__fixtures__/kitchen-sink/pretty/formatting.sql b/__fixtures__/kitchen-sink/pretty/formatting.sql
new file mode 100644
index 00000000..fc0303d1
--- /dev/null
+++ b/__fixtures__/kitchen-sink/pretty/formatting.sql
@@ -0,0 +1,40 @@
+-- 1. EXPLAIN with COSTS OFF - tests optional keyword preservation
+-- Some deparsers may omit optional keywords like COSTS OFF
+-- This documents that EXPLAIN (COSTS OFF) may deparse differently than EXPLAIN alone
+EXPLAIN (COSTS OFF) SELECT * FROM onek2 WHERE unique2 = 11 AND stringu1 = 'ATAAAA';
+
+-- 2. EXPLAIN without COSTS (default behavior)
+EXPLAIN SELECT * FROM onek2 WHERE unique2 = 11 AND stringu1 = 'ATAAAA';
+
+-- 3. Boolean literal formatting - INPUT FORM with 't'::boolean cast
+-- The deparser may normalize this to TRUE
+INSERT INTO objects.object (name, val, active, hash)
+VALUES ('name', 'val', 't'::boolean, 'abcdefg'),
+       ('name', 'val', 't'::boolean, 'abcdefg'),
+       ('name', 'val', 't'::boolean, 'abcdefg');
+
+-- 4. Boolean literal formatting - CANONICAL FORM with TRUE
+INSERT INTO objects.object (name, val, active, hash)
+VALUES ('name', 'val', TRUE, 'abcdefg'),
+       ('name', 'val', TRUE, 'abcdefg'),
+       ('name', 'val', TRUE, 'abcdefg');
+
+-- 5. Boolean literal formatting - CANONICAL FORM with FALSE
+INSERT INTO objects.object (name, val, active, hash)
+VALUES ('name', 'val', FALSE, 'abcdefg');
+
+-- 6. Boolean literal formatting - INPUT FORM with 'f'::boolean cast
+-- The deparser may normalize this to FALSE
+INSERT INTO objects.object (name, val, active, hash)
+VALUES ('name', 'val', 'f'::boolean, 'abcdefg');
+
+-- 7. Parenthesization / argument formatting with IN parameter mode
+-- Tests formatting of function parameters with IN mode and custom types
+-- Input form: ( IN p1 pos_int )
+CREATE FUNCTION test_func(IN p1 pos_int) RETURNS void AS $$ BEGIN NULL; END; $$ LANGUAGE plpgsql;
+
+-- 8. Parenthesization with multiple IN parameters
+CREATE FUNCTION test_func2(IN p1 pos_int, IN p2 text) RETURNS void AS $$ BEGIN NULL; END; $$ LANGUAGE plpgsql;
+
+-- 9. Mixed parameter modes (IN, OUT, INOUT)
+CREATE FUNCTION test_func3(IN p1 integer, OUT p2 text, INOUT p3 boolean) RETURNS record AS $$ BEGIN p2 := 'test'; END; $$ LANGUAGE plpgsql;
diff --git a/__fixtures__/kitchen-sink/pretty/quoting.sql b/__fixtures__/kitchen-sink/pretty/quoting.sql
new file mode 100644
index 00000000..869e5fb7
--- /dev/null
+++ b/__fixtures__/kitchen-sink/pretty/quoting.sql
@@ -0,0 +1,47 @@
+-- 1. Unquoted function name "float" (reserved keyword) - INPUT FORM
+-- The deparser should quote this reserved keyword
+CREATE FUNCTION faker.float(min double precision DEFAULT 0, max double precision DEFAULT 100) RETURNS double precision AS $EOFCODE$
+BEGIN
+  RETURN min + random() * (max - min);
+END;
+$EOFCODE$ LANGUAGE plpgsql;
+
+-- 2. Quoted function name "float" - CANONICAL FORM (idempotence check)
+CREATE FUNCTION faker."float"(min double precision DEFAULT 0, max double precision DEFAULT 100) RETURNS double precision AS $EOFCODE$
+BEGIN
+  RETURN min + random() * (max - min);
+END;
+$EOFCODE$ LANGUAGE plpgsql;
+
+-- 3. Unquoted function name "interval" (reserved keyword) - INPUT FORM
+CREATE FUNCTION faker.interval(min int, max int) RETURNS interval AS $EOFCODE$
+BEGIN
+  RETURN make_interval(secs => (min + floor(random() * (max - min + 1)))::int);
+END;
+$EOFCODE$ LANGUAGE plpgsql;
+
+-- 4. Quoted function name "interval" - CANONICAL FORM (idempotence check)
+CREATE FUNCTION faker."interval"(min int, max int) RETURNS interval AS $EOFCODE$
+BEGIN
+  RETURN make_interval(secs => (min + floor(random() * (max - min + 1)))::int);
+END;
+$EOFCODE$ LANGUAGE plpgsql;
+
+-- 5. Unquoted function name "boolean" (reserved keyword) - INPUT FORM
+CREATE FUNCTION faker.boolean() RETURNS boolean AS $EOFCODE$
+BEGIN
+  RETURN random() < 0.5;
+END;
+$EOFCODE$ LANGUAGE plpgsql;
+
+-- 6. Quoted function name "boolean" - CANONICAL FORM (idempotence check)
+CREATE FUNCTION faker."boolean"() RETURNS boolean AS $EOFCODE$
+BEGIN
+  RETURN random() < 0.5;
+END;
+$EOFCODE$ LANGUAGE plpgsql;
+
+-- 7. pg_catalog.substring with quoted identifier - CANONICAL FORM
+-- Note: SUBSTRING(value FROM 'pattern') SQL syntax gets deparsed to pg_catalog."substring"(value, 'pattern')
+-- The SQL syntax form cannot be tested here due to AST round-trip differences (COERCE_SQL_SYNTAX vs COERCE_EXPLICIT_CALL)
+CREATE DOMAIN origin AS text CHECK (value = pg_catalog."substring"(value, '^(https?://[^/]*)'));
diff --git a/packages/deparser/__tests__/pretty/__snapshots__/formatting-pretty.test.ts.snap b/packages/deparser/__tests__/pretty/__snapshots__/formatting-pretty.test.ts.snap
new file mode 100644
index 00000000..9f466abe
--- /dev/null
+++ b/packages/deparser/__tests__/pretty/__snapshots__/formatting-pretty.test.ts.snap
@@ -0,0 +1,85 @@
+// Jest Snapshot v1, https://jestjs.io/docs/snapshot-testing
+
+exports[`non-pretty: pretty/formatting-1.sql 1`] = `"EXPLAIN (COSTS OFF) SELECT * FROM onek2 WHERE unique2 = 11 AND stringu1 = 'ATAAAA'"`;
+
+exports[`non-pretty: pretty/formatting-2.sql 1`] = `"EXPLAIN SELECT * FROM onek2 WHERE unique2 = 11 AND stringu1 = 'ATAAAA'"`;
+
+exports[`non-pretty: pretty/formatting-3.sql 1`] = `"INSERT INTO objects.object (name, val, active, hash) VALUES ('name', 'val', CAST('t' AS boolean), 'abcdefg'), ('name', 'val', CAST('t' AS boolean), 'abcdefg'), ('name', 'val', CAST('t' AS boolean), 'abcdefg')"`;
+
+exports[`non-pretty: pretty/formatting-4.sql 1`] = `"INSERT INTO objects.object (name, val, active, hash) VALUES ('name', 'val', true, 'abcdefg'), ('name', 'val', true, 'abcdefg'), ('name', 'val', true, 'abcdefg')"`;
+
+exports[`non-pretty: pretty/formatting-5.sql 1`] = `"INSERT INTO objects.object (name, val, active, hash) VALUES ('name', 'val', false, 'abcdefg')"`;
+
+exports[`non-pretty: pretty/formatting-6.sql 1`] = `"INSERT INTO objects.object (name, val, active, hash) VALUES ('name', 'val', CAST('f' AS boolean), 'abcdefg')"`;
+
+exports[`non-pretty: pretty/formatting-7.sql 1`] = `"CREATE FUNCTION test_func(IN p1 pos_int) RETURNS void AS $$ BEGIN NULL; END; $$ LANGUAGE plpgsql"`;
+
+exports[`non-pretty: pretty/formatting-8.sql 1`] = `"CREATE FUNCTION test_func2(IN p1 pos_int, IN p2 text) RETURNS void AS $$ BEGIN NULL; END; $$ LANGUAGE plpgsql"`;
+
+exports[`non-pretty: pretty/formatting-9.sql 1`] = `"CREATE FUNCTION test_func3(IN p1 int, OUT p2 text, INOUT p3 boolean) RETURNS record AS $$ BEGIN p2 := 'test'; END; $$ LANGUAGE plpgsql"`;
+
+exports[`pretty: pretty/formatting-1.sql 1`] = `
+"EXPLAIN (COSTS OFF) SELECT *
+FROM onek2
+WHERE
+  unique2 = 11
+  AND stringu1 = 'ATAAAA'"
+`;
+
+exports[`pretty: pretty/formatting-2.sql 1`] = `
+"EXPLAIN SELECT *
+FROM onek2
+WHERE
+  unique2 = 11
+  AND stringu1 = 'ATAAAA'"
+`;
+
+exports[`pretty: pretty/formatting-3.sql 1`] = `
+"INSERT INTO objects.object (
+  name,
+  val,
+  active,
+  hash
+) VALUES
+  ('name', 'val', CAST('t' AS boolean), 'abcdefg'),
+  ('name', 'val', CAST('t' AS boolean), 'abcdefg'),
+  ('name', 'val', CAST('t' AS boolean), 'abcdefg')"
+`;
+
+exports[`pretty: pretty/formatting-4.sql 1`] = `
+"INSERT INTO objects.object (
+  name,
+  val,
+  active,
+  hash
+) VALUES
+  ('name', 'val', true, 'abcdefg'),
+  ('name', 'val', true, 'abcdefg'),
+  ('name', 'val', true, 'abcdefg')"
+`;
+
+exports[`pretty: pretty/formatting-5.sql 1`] = `
+"INSERT INTO objects.object (
+  name,
+  val,
+  active,
+  hash
+) VALUES
+  ('name', 'val', false, 'abcdefg')"
+`;
+
+exports[`pretty: pretty/formatting-6.sql 1`] = `
+"INSERT INTO objects.object (
+  name,
+  val,
+  active,
+  hash
+) VALUES
+  ('name', 'val', CAST('f' AS boolean), 'abcdefg')"
+`;
+
+exports[`pretty: pretty/formatting-7.sql 1`] = `"CREATE FUNCTION test_func(IN p1 pos_int) RETURNS void AS $$ BEGIN NULL; END; $$ LANGUAGE plpgsql"`;
+
+exports[`pretty: pretty/formatting-8.sql 1`] = `"CREATE FUNCTION test_func2(IN p1 pos_int, IN p2 text) RETURNS void AS $$ BEGIN NULL; END; $$ LANGUAGE plpgsql"`;
+
+exports[`pretty: pretty/formatting-9.sql 1`] = `"CREATE FUNCTION test_func3(IN p1 int, OUT p2 text, INOUT p3 boolean) RETURNS record AS $$ BEGIN p2 := 'test'; END; $$ LANGUAGE plpgsql"`;
diff --git a/packages/deparser/__tests__/pretty/__snapshots__/quoting-pretty.test.ts.snap b/packages/deparser/__tests__/pretty/__snapshots__/quoting-pretty.test.ts.snap
new file mode 100644
index 00000000..2a7f41dc
--- /dev/null
+++ b/packages/deparser/__tests__/pretty/__snapshots__/quoting-pretty.test.ts.snap
@@ -0,0 +1,104 @@
+// Jest Snapshot v1, https://jestjs.io/docs/snapshot-testing
+
+exports[`non-pretty: pretty/quoting-1.sql 1`] = `
+"CREATE FUNCTION faker."float"(min double precision DEFAULT 0, max double precision DEFAULT 100) RETURNS double precision AS $$
+BEGIN
+  RETURN min + random() * (max - min);
+END;
+$$ LANGUAGE plpgsql"
+`;
+
+exports[`non-pretty: pretty/quoting-2.sql 1`] = `
+"CREATE FUNCTION faker."float"(min double precision DEFAULT 0, max double precision DEFAULT 100) RETURNS double precision AS $$
+BEGIN
+  RETURN min + random() * (max - min);
+END;
+$$ LANGUAGE plpgsql"
+`;
+
+exports[`non-pretty: pretty/quoting-3.sql 1`] = `
+"CREATE FUNCTION faker."interval"(min int, max int) RETURNS interval AS $$
+BEGIN
+  RETURN make_interval(secs => (min + floor(random() * (max - min + 1)))::int);
+END;
+$$ LANGUAGE plpgsql"
+`;
+
+exports[`non-pretty: pretty/quoting-4.sql 1`] = `
+"CREATE FUNCTION faker."interval"(min int, max int) RETURNS interval AS $$
+BEGIN
+  RETURN make_interval(secs => (min + floor(random() * (max - min + 1)))::int);
+END;
+$$ LANGUAGE plpgsql"
+`;
+
+exports[`non-pretty: pretty/quoting-5.sql 1`] = `
+"CREATE FUNCTION faker."boolean"() RETURNS boolean AS $$
+BEGIN
+  RETURN random() < 0.5;
+END;
+$$ LANGUAGE plpgsql"
+`;
+
+exports[`non-pretty: pretty/quoting-6.sql 1`] = `
+"CREATE FUNCTION faker."boolean"() RETURNS boolean AS $$
+BEGIN
+  RETURN random() < 0.5;
+END;
+$$ LANGUAGE plpgsql"
+`;
+
+exports[`non-pretty: pretty/quoting-7.sql 1`] = `"CREATE DOMAIN origin AS text CHECK (value = pg_catalog."substring"(value, '^(https?://[^/]*)'))"`;
+
+exports[`pretty: pretty/quoting-1.sql 1`] = `
+"CREATE FUNCTION faker."float"(min double precision DEFAULT 0, max double precision DEFAULT 100) RETURNS double precision AS $$
+BEGIN
+  RETURN min + random() * (max - min);
+END;
+$$ LANGUAGE plpgsql"
+`;
+
+exports[`pretty: pretty/quoting-2.sql 1`] = `
+"CREATE FUNCTION faker."float"(min double precision DEFAULT 0, max double precision DEFAULT 100) RETURNS double precision AS $$
+BEGIN
+  RETURN min + random() * (max - min);
+END;
+$$ LANGUAGE plpgsql"
+`;
+
+exports[`pretty: pretty/quoting-3.sql 1`] = `
+"CREATE FUNCTION faker."interval"(min int, max int) RETURNS interval AS $$
+BEGIN
+  RETURN make_interval(secs => (min + floor(random() * (max - min + 1)))::int);
+END;
+$$ LANGUAGE plpgsql"
+`;
+
+exports[`pretty: pretty/quoting-4.sql 1`] = `
+"CREATE FUNCTION faker."interval"(min int, max int) RETURNS interval AS $$
+BEGIN
+  RETURN make_interval(secs => (min + floor(random() * (max - min + 1)))::int);
+END;
+$$ LANGUAGE plpgsql"
+`;
+
+exports[`pretty: pretty/quoting-5.sql 1`] = `
+"CREATE FUNCTION faker."boolean"() RETURNS boolean AS $$
+BEGIN
+  RETURN random() < 0.5;
+END;
+$$ LANGUAGE plpgsql"
+`;
+
+exports[`pretty: pretty/quoting-6.sql 1`] = `
+"CREATE FUNCTION faker."boolean"() RETURNS boolean AS $$
+BEGIN
+  RETURN random() < 0.5;
+END;
+$$ LANGUAGE plpgsql"
+`;
+
+exports[`pretty: pretty/quoting-7.sql 1`] = `
+"CREATE DOMAIN origin AS text 
+  CHECK (value = pg_catalog."substring"(value, '^(https?://[^/]*)'))"
+`;
diff --git a/packages/deparser/__tests__/pretty/formatting-pretty.test.ts b/packages/deparser/__tests__/pretty/formatting-pretty.test.ts
new file mode 100644
index 00000000..aee7c727
--- /dev/null
+++ b/packages/deparser/__tests__/pretty/formatting-pretty.test.ts
@@ -0,0 +1,14 @@
+import { PrettyTest } from '../../test-utils/PrettyTest';
+const prettyTest = new PrettyTest([
+  'pretty/formatting-1.sql',
+  'pretty/formatting-2.sql',
+  'pretty/formatting-3.sql',
+  'pretty/formatting-4.sql',
+  'pretty/formatting-5.sql',
+  'pretty/formatting-6.sql',
+  'pretty/formatting-7.sql',
+  'pretty/formatting-8.sql',
+  'pretty/formatting-9.sql',
+]);
+
+prettyTest.generateTests();
diff --git a/packages/deparser/__tests__/pretty/quoting-pretty.test.ts b/packages/deparser/__tests__/pretty/quoting-pretty.test.ts
new file mode 100644
index 00000000..1d663374
--- /dev/null
+++ b/packages/deparser/__tests__/pretty/quoting-pretty.test.ts
@@ -0,0 +1,12 @@
+import { PrettyTest } from '../../test-utils/PrettyTest';
+const prettyTest = new PrettyTest([
+  'pretty/quoting-1.sql',
+  'pretty/quoting-2.sql',
+  'pretty/quoting-3.sql',
+  'pretty/quoting-4.sql',
+  'pretty/quoting-5.sql',
+  'pretty/quoting-6.sql',
+  'pretty/quoting-7.sql',
+]);
+
+prettyTest.generateTests();