diff --git a/packages/params/src/index.ts b/packages/params/src/index.ts
index 29ac446d6390..a2235354d18a 100644
--- a/packages/params/src/index.ts
+++ b/packages/params/src/index.ts
@@ -5,7 +5,7 @@ import {gnosisPreset} from "./presets/gnosis.js";
 import {presetStatus} from "./presetStatus.js";
 import {userSelectedPreset, userOverrides} from "./setPreset.js";
 
-export {BeaconPreset} from "./interface.js";
+export {BeaconPreset} from "./types.js";
 export {
   ForkName,
   ForkSeq,
@@ -39,7 +39,7 @@ presetStatus.frozen = true;
  */
 export const ACTIVE_PRESET =
   userSelectedPreset ?? PresetName[process?.env?.LODESTAR_PRESET as PresetName] ?? PresetName.mainnet;
-export const activePreset = presets[ACTIVE_PRESET];
+export const activePreset = {...presets[ACTIVE_PRESET], ...userOverrides};
 
 // These variables must be exported individually and explicitly
 // in order to be accessible as top-level exports
@@ -99,7 +99,7 @@ export const {
 
   FIELD_ELEMENTS_PER_BLOB,
   MAX_BLOBS_PER_BLOCK,
-} = {...presets[ACTIVE_PRESET], ...userOverrides};
+} = activePreset;
 
 ////////////
 // Constants
diff --git a/packages/params/src/interface.ts b/packages/params/src/interface.ts
deleted file mode 100644
index 41628fd2cf72..000000000000
--- a/packages/params/src/interface.ts
+++ /dev/null
@@ -1,79 +0,0 @@
-/* eslint-disable @typescript-eslint/naming-convention */
-export interface BeaconPreset {
-  // Misc
-  MAX_COMMITTEES_PER_SLOT: number;
-  TARGET_COMMITTEE_SIZE: number;
-  MAX_VALIDATORS_PER_COMMITTEE: number;
-
-  SHUFFLE_ROUND_COUNT: number;
-
-  HYSTERESIS_QUOTIENT: number;
-  HYSTERESIS_DOWNWARD_MULTIPLIER: number;
-  HYSTERESIS_UPWARD_MULTIPLIER: number;
-
-  // Gwei Values
-  MIN_DEPOSIT_AMOUNT: number;
-  MAX_EFFECTIVE_BALANCE: number;
-  EFFECTIVE_BALANCE_INCREMENT: number;
-
-  // Time parameters
-  MIN_ATTESTATION_INCLUSION_DELAY: number;
-  SLOTS_PER_EPOCH: number;
-  MIN_SEED_LOOKAHEAD: number;
-  MAX_SEED_LOOKAHEAD: number;
-  EPOCHS_PER_ETH1_VOTING_PERIOD: number;
-  SLOTS_PER_HISTORICAL_ROOT: number;
-  MIN_EPOCHS_TO_INACTIVITY_PENALTY: number;
-
-  // State vector lengths
-  EPOCHS_PER_HISTORICAL_VECTOR: number;
-  EPOCHS_PER_SLASHINGS_VECTOR: number;
-  HISTORICAL_ROOTS_LIMIT: number;
-  VALIDATOR_REGISTRY_LIMIT: number;
-
-  // Reward and penalty quotients
-  BASE_REWARD_FACTOR: number;
-  WHISTLEBLOWER_REWARD_QUOTIENT: number;
-  PROPOSER_REWARD_QUOTIENT: number;
-  INACTIVITY_PENALTY_QUOTIENT: number;
-  MIN_SLASHING_PENALTY_QUOTIENT: number;
-  PROPORTIONAL_SLASHING_MULTIPLIER: number;
-
-  // Max operations per block
-  MAX_PROPOSER_SLASHINGS: number;
-  MAX_ATTESTER_SLASHINGS: number;
-  MAX_ATTESTATIONS: number;
-  MAX_DEPOSITS: number;
-  MAX_VOLUNTARY_EXITS: number;
-
-  // ALTAIR
-  /////////
-  SYNC_COMMITTEE_SIZE: number;
-  EPOCHS_PER_SYNC_COMMITTEE_PERIOD: number;
-  INACTIVITY_PENALTY_QUOTIENT_ALTAIR: number;
-  MIN_SLASHING_PENALTY_QUOTIENT_ALTAIR: number;
-  PROPORTIONAL_SLASHING_MULTIPLIER_ALTAIR: number;
-  MIN_SYNC_COMMITTEE_PARTICIPANTS: number;
-  UPDATE_TIMEOUT: number;
-
-  // BELLATRIX
-  ////////////
-  INACTIVITY_PENALTY_QUOTIENT_BELLATRIX: number;
-  MIN_SLASHING_PENALTY_QUOTIENT_BELLATRIX: number;
-  PROPORTIONAL_SLASHING_MULTIPLIER_BELLATRIX: number;
-  MAX_BYTES_PER_TRANSACTION: number;
-  MAX_TRANSACTIONS_PER_PAYLOAD: number;
-  BYTES_PER_LOGS_BLOOM: number;
-  MAX_EXTRA_DATA_BYTES: number;
-
-  // CAPELLA
-  //////////
-  MAX_BLS_TO_EXECUTION_CHANGES: number;
-  MAX_WITHDRAWALS_PER_PAYLOAD: number;
-  MAX_VALIDATORS_PER_WITHDRAWALS_SWEEP: number;
-
-  // EIP-4844
-  ///////////
-  FIELD_ELEMENTS_PER_BLOB: number;
-  MAX_BLOBS_PER_BLOCK: number;
-}
diff --git a/packages/params/src/json.ts b/packages/params/src/json.ts
index 390550f409a6..ffb041cbb63d 100644
--- a/packages/params/src/json.ts
+++ b/packages/params/src/json.ts
@@ -1,4 +1,4 @@
-import {BeaconPreset} from "./interface.js";
+import {BeaconPreset, beaconPresetTypes} from "./types.js";
 
 /**
  * Render BeaconPreset to JSON strings
@@ -25,14 +25,15 @@ function serializePresetValue(value: number): string {
 /**
  * Parse JSON strings of BeaconPreset
  * - Numbers: Convert quoted decimal string to number
- *
- * Note: extraneous keys are not filtered out and will be validated
  */
 export function presetFromJson(json: Record<string, unknown>): Partial<BeaconPreset> {
   const beaconPreset = {} as BeaconPreset;
 
-  for (const key of Object.keys(json) as (keyof BeaconPreset)[]) {
-    beaconPreset[key] = deserializePresetValue(json[key], key);
+  for (const key of Object.keys(beaconPresetTypes) as (keyof BeaconPreset)[]) {
+    const value = json[key];
+    if (value !== undefined) {
+      beaconPreset[key] = deserializePresetValue(value, key);
+    }
   }
 
   return beaconPreset;
diff --git a/packages/params/src/presets/gnosis.ts b/packages/params/src/presets/gnosis.ts
index 4ca9fc897831..284d098b67b4 100644
--- a/packages/params/src/presets/gnosis.ts
+++ b/packages/params/src/presets/gnosis.ts
@@ -1,4 +1,4 @@
-import {BeaconPreset} from "../interface.js";
+import {BeaconPreset} from "../types.js";
 import {mainnetPreset} from "./mainnet.js";
 
 /* eslint-disable @typescript-eslint/naming-convention */
diff --git a/packages/params/src/presets/mainnet.ts b/packages/params/src/presets/mainnet.ts
index 5026858bd934..a53c3912c96b 100644
--- a/packages/params/src/presets/mainnet.ts
+++ b/packages/params/src/presets/mainnet.ts
@@ -1,4 +1,4 @@
-import {BeaconPreset} from "../interface.js";
+import {BeaconPreset} from "../types.js";
 
 /* eslint-disable @typescript-eslint/naming-convention */
 export const mainnetPreset: BeaconPreset = {
diff --git a/packages/params/src/presets/minimal.ts b/packages/params/src/presets/minimal.ts
index ce2e66b23f99..b04ed6773987 100644
--- a/packages/params/src/presets/minimal.ts
+++ b/packages/params/src/presets/minimal.ts
@@ -1,4 +1,4 @@
-import {BeaconPreset} from "../interface.js";
+import {BeaconPreset} from "../types.js";
 
 /* eslint-disable @typescript-eslint/naming-convention */
 export const minimalPreset: BeaconPreset = {
diff --git a/packages/params/src/setPreset.ts b/packages/params/src/setPreset.ts
index b8d5b5ded653..61836d86a241 100644
--- a/packages/params/src/setPreset.ts
+++ b/packages/params/src/setPreset.ts
@@ -1,6 +1,6 @@
 import {PresetName} from "./presetName.js";
 import {presetStatus} from "./presetStatus.js";
-import {BeaconPreset} from "./interface.js";
+import {BeaconPreset} from "./types.js";
 import {presetFromJson} from "./json.js";
 
 export {PresetName, presetFromJson};
diff --git a/packages/params/src/types.ts b/packages/params/src/types.ts
new file mode 100644
index 000000000000..c7a47b45107c
--- /dev/null
+++ b/packages/params/src/types.ts
@@ -0,0 +1,170 @@
+/* eslint-disable @typescript-eslint/naming-convention */
+
+/**
+ * Compile-time chain configuration
+ */
+export type BeaconPreset = {
+  // Misc
+  MAX_COMMITTEES_PER_SLOT: number;
+  TARGET_COMMITTEE_SIZE: number;
+  MAX_VALIDATORS_PER_COMMITTEE: number;
+
+  SHUFFLE_ROUND_COUNT: number;
+
+  HYSTERESIS_QUOTIENT: number;
+  HYSTERESIS_DOWNWARD_MULTIPLIER: number;
+  HYSTERESIS_UPWARD_MULTIPLIER: number;
+
+  // Gwei Values
+  MIN_DEPOSIT_AMOUNT: number;
+  MAX_EFFECTIVE_BALANCE: number;
+  EFFECTIVE_BALANCE_INCREMENT: number;
+
+  // Time parameters
+  MIN_ATTESTATION_INCLUSION_DELAY: number;
+  SLOTS_PER_EPOCH: number;
+  MIN_SEED_LOOKAHEAD: number;
+  MAX_SEED_LOOKAHEAD: number;
+  EPOCHS_PER_ETH1_VOTING_PERIOD: number;
+  SLOTS_PER_HISTORICAL_ROOT: number;
+  MIN_EPOCHS_TO_INACTIVITY_PENALTY: number;
+
+  // State vector lengths
+  EPOCHS_PER_HISTORICAL_VECTOR: number;
+  EPOCHS_PER_SLASHINGS_VECTOR: number;
+  HISTORICAL_ROOTS_LIMIT: number;
+  VALIDATOR_REGISTRY_LIMIT: number;
+
+  // Reward and penalty quotients
+  BASE_REWARD_FACTOR: number;
+  WHISTLEBLOWER_REWARD_QUOTIENT: number;
+  PROPOSER_REWARD_QUOTIENT: number;
+  INACTIVITY_PENALTY_QUOTIENT: number;
+  MIN_SLASHING_PENALTY_QUOTIENT: number;
+  PROPORTIONAL_SLASHING_MULTIPLIER: number;
+
+  // Max operations per block
+  MAX_PROPOSER_SLASHINGS: number;
+  MAX_ATTESTER_SLASHINGS: number;
+  MAX_ATTESTATIONS: number;
+  MAX_DEPOSITS: number;
+  MAX_VOLUNTARY_EXITS: number;
+
+  // ALTAIR
+  /////////
+  SYNC_COMMITTEE_SIZE: number;
+  EPOCHS_PER_SYNC_COMMITTEE_PERIOD: number;
+  INACTIVITY_PENALTY_QUOTIENT_ALTAIR: number;
+  MIN_SLASHING_PENALTY_QUOTIENT_ALTAIR: number;
+  PROPORTIONAL_SLASHING_MULTIPLIER_ALTAIR: number;
+  MIN_SYNC_COMMITTEE_PARTICIPANTS: number;
+  UPDATE_TIMEOUT: number;
+
+  // BELLATRIX
+  ////////////
+  INACTIVITY_PENALTY_QUOTIENT_BELLATRIX: number;
+  MIN_SLASHING_PENALTY_QUOTIENT_BELLATRIX: number;
+  PROPORTIONAL_SLASHING_MULTIPLIER_BELLATRIX: number;
+  MAX_BYTES_PER_TRANSACTION: number;
+  MAX_TRANSACTIONS_PER_PAYLOAD: number;
+  BYTES_PER_LOGS_BLOOM: number;
+  MAX_EXTRA_DATA_BYTES: number;
+
+  // CAPELLA
+  //////////
+  MAX_BLS_TO_EXECUTION_CHANGES: number;
+  MAX_WITHDRAWALS_PER_PAYLOAD: number;
+  MAX_VALIDATORS_PER_WITHDRAWALS_SWEEP: number;
+
+  // EIP-4844
+  ///////////
+  FIELD_ELEMENTS_PER_BLOB: number;
+  MAX_BLOBS_PER_BLOCK: number;
+};
+
+/**
+ * Presets only contain numbers, just used to filter out extraneous keys
+ * when overriding the active preset with custom values from file
+ */
+export const beaconPresetTypes: BeaconPresetTypes = {
+  // Misc
+  MAX_COMMITTEES_PER_SLOT: "number",
+  TARGET_COMMITTEE_SIZE: "number",
+  MAX_VALIDATORS_PER_COMMITTEE: "number",
+
+  SHUFFLE_ROUND_COUNT: "number",
+
+  HYSTERESIS_QUOTIENT: "number",
+  HYSTERESIS_DOWNWARD_MULTIPLIER: "number",
+  HYSTERESIS_UPWARD_MULTIPLIER: "number",
+
+  // Gwei Values
+  MIN_DEPOSIT_AMOUNT: "number",
+  MAX_EFFECTIVE_BALANCE: "number",
+  EFFECTIVE_BALANCE_INCREMENT: "number",
+
+  // Time parameters
+  MIN_ATTESTATION_INCLUSION_DELAY: "number",
+  SLOTS_PER_EPOCH: "number",
+  MIN_SEED_LOOKAHEAD: "number",
+  MAX_SEED_LOOKAHEAD: "number",
+  EPOCHS_PER_ETH1_VOTING_PERIOD: "number",
+  SLOTS_PER_HISTORICAL_ROOT: "number",
+  MIN_EPOCHS_TO_INACTIVITY_PENALTY: "number",
+
+  // State vector lengths
+  EPOCHS_PER_HISTORICAL_VECTOR: "number",
+  EPOCHS_PER_SLASHINGS_VECTOR: "number",
+  HISTORICAL_ROOTS_LIMIT: "number",
+  VALIDATOR_REGISTRY_LIMIT: "number",
+
+  // Reward and penalty quotients
+  BASE_REWARD_FACTOR: "number",
+  WHISTLEBLOWER_REWARD_QUOTIENT: "number",
+  PROPOSER_REWARD_QUOTIENT: "number",
+  INACTIVITY_PENALTY_QUOTIENT: "number",
+  MIN_SLASHING_PENALTY_QUOTIENT: "number",
+  PROPORTIONAL_SLASHING_MULTIPLIER: "number",
+
+  // Max operations per block
+  MAX_PROPOSER_SLASHINGS: "number",
+  MAX_ATTESTER_SLASHINGS: "number",
+  MAX_ATTESTATIONS: "number",
+  MAX_DEPOSITS: "number",
+  MAX_VOLUNTARY_EXITS: "number",
+
+  // ALTAIR
+  /////////
+  SYNC_COMMITTEE_SIZE: "number",
+  EPOCHS_PER_SYNC_COMMITTEE_PERIOD: "number",
+  INACTIVITY_PENALTY_QUOTIENT_ALTAIR: "number",
+  MIN_SLASHING_PENALTY_QUOTIENT_ALTAIR: "number",
+  PROPORTIONAL_SLASHING_MULTIPLIER_ALTAIR: "number",
+  MIN_SYNC_COMMITTEE_PARTICIPANTS: "number",
+  UPDATE_TIMEOUT: "number",
+
+  // BELLATRIX
+  ////////////
+  INACTIVITY_PENALTY_QUOTIENT_BELLATRIX: "number",
+  MIN_SLASHING_PENALTY_QUOTIENT_BELLATRIX: "number",
+  PROPORTIONAL_SLASHING_MULTIPLIER_BELLATRIX: "number",
+  MAX_BYTES_PER_TRANSACTION: "number",
+  MAX_TRANSACTIONS_PER_PAYLOAD: "number",
+  BYTES_PER_LOGS_BLOOM: "number",
+  MAX_EXTRA_DATA_BYTES: "number",
+
+  // CAPELLA
+  //////////
+  MAX_BLS_TO_EXECUTION_CHANGES: "number",
+  MAX_WITHDRAWALS_PER_PAYLOAD: "number",
+  MAX_VALIDATORS_PER_WITHDRAWALS_SWEEP: "number",
+
+  // EIP-4844
+  ///////////
+  FIELD_ELEMENTS_PER_BLOB: "number",
+  MAX_BLOBS_PER_BLOCK: "number",
+};
+
+type BeaconPresetTypes = {
+  [K in keyof BeaconPreset]: "number";
+};
diff --git a/packages/params/test/e2e/overridePresetOk.ts b/packages/params/test/e2e/overridePresetOk.ts
index 25879c81212a..7373ecee7fff 100644
--- a/packages/params/test/e2e/overridePresetOk.ts
+++ b/packages/params/test/e2e/overridePresetOk.ts
@@ -2,7 +2,7 @@ import assert from "node:assert";
 
 /* eslint import/order: "off" */
 // This script is should be run in an e2e !!
-// It demostrates how to properly change the Lodestar preset safely
+// It demonstrates how to properly change the Lodestar preset safely
 
 // 1. Import from @lodestar/params/setPreset only
 import {setActivePreset, PresetName} from "../../src/setPreset.js";
@@ -11,8 +11,10 @@ setActivePreset(PresetName.minimal, {SLOTS_PER_EPOCH: 2});
 
 // 2. Import from any other @lodestar/params paths
 
-const {SLOTS_PER_EPOCH, BASE_REWARD_FACTOR} = await import("../../src/index.js");
+const {activePreset, SLOTS_PER_EPOCH, BASE_REWARD_FACTOR} = await import("../../src/index.js");
 
-assert.equal(SLOTS_PER_EPOCH, 2, "SLOTS_PER_EPOCH should have overriden preset value");
+assert.equal(SLOTS_PER_EPOCH, 2, "SLOTS_PER_EPOCH should have overridden preset value");
+assert.equal(activePreset.SLOTS_PER_EPOCH, 2, "activePreset.SLOTS_PER_EPOCH should have overridden preset value");
 assert.equal(BASE_REWARD_FACTOR, 64, "BASE_REWARD_FACTOR should have preset value");
+assert.equal(activePreset.BASE_REWARD_FACTOR, 64, "activePreset.BASE_REWARD_FACTOR should have preset value");
 assert.equal(process.env.LODESTAR_PRESET, undefined, "LODESTAR_PRESET ENV must not be set");