diff --git a/.prettierignore b/.prettierignore
index 8cca56c93fb..86750c6ed78 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -21,3 +21,4 @@
 !/scripts/find-troublesome-ancestors.ts
 !/scripts/release.ts
 !/scripts/update-drafts.ts
+!/scripts/validate.ts
diff --git a/package.json b/package.json
index c78a26c5861..bf476070a20 100644
--- a/package.json
+++ b/package.json
@@ -16,12 +16,13 @@
     "node": ">=18.19.0"
   },
   "scripts": {
+    "build:extended": "tsx scripts/build.ts extended-json",
     "build": "tsx scripts/build.ts package",
     "dist": "tsx scripts/dist.ts",
     "feature-init": "tsx scripts/feature-init.ts",
     "format": "npx prettier --write .",
     "schema:write": "npm run schema -- --out ./schemas/data.schema.json",
-    "schema": "ts-json-schema-generator --tsconfig ./tsconfig.json --path ./types.ts",
+    "schema": "ts-json-schema-generator --tsconfig ./tsconfig.json --path ./types.ts --type=WebFeaturesData",
     "test:caniuse": "tsx scripts/caniuse.ts",
     "test:coverage": "npm run --workspaces test:coverage",
     "test:dist": "tsx scripts/dist.ts --check",
diff --git a/schemas/data.schema.json b/schemas/data.schema.json
index 8d07d51fcd8..f4ff58970ae 100644
--- a/schemas/data.schema.json
+++ b/schemas/data.schema.json
@@ -1,4 +1,5 @@
 {
+  "$ref": "#/definitions/WebFeaturesData",
   "$schema": "http://json-schema.org/draft-07/schema#",
   "definitions": {
     "FeatureData": {
@@ -111,6 +112,68 @@
               "description": "Date the feature achieved Baseline low status",
               "type": "string"
             },
+            "by_compat_key": {
+              "additionalProperties": {
+                "additionalProperties": false,
+                "properties": {
+                  "baseline": {
+                    "description": "Whether the feature is Baseline (low substatus), Baseline (high substatus), or not (false)",
+                    "enum": [
+                      "high",
+                      "low",
+                      false
+                    ],
+                    "type": [
+                      "string",
+                      "boolean"
+                    ]
+                  },
+                  "baseline_high_date": {
+                    "description": "Date the feature achieved Baseline high status",
+                    "type": "string"
+                  },
+                  "baseline_low_date": {
+                    "description": "Date the feature achieved Baseline low status",
+                    "type": "string"
+                  },
+                  "support": {
+                    "additionalProperties": false,
+                    "description": "Browser versions that most-recently introduced the feature",
+                    "properties": {
+                      "chrome": {
+                        "type": "string"
+                      },
+                      "chrome_android": {
+                        "type": "string"
+                      },
+                      "edge": {
+                        "type": "string"
+                      },
+                      "firefox": {
+                        "type": "string"
+                      },
+                      "firefox_android": {
+                        "type": "string"
+                      },
+                      "safari": {
+                        "type": "string"
+                      },
+                      "safari_ios": {
+                        "type": "string"
+                      }
+                    },
+                    "type": "object"
+                  }
+                },
+                "required": [
+                  "baseline",
+                  "support"
+                ],
+                "type": "object"
+              },
+              "description": "Statuses for each key in the feature's compat_features list, if applicable. Not available to the npm release of web-features.",
+              "type": "object"
+            },
             "support": {
               "additionalProperties": false,
               "description": "Browser versions that most-recently introduced the feature",
diff --git a/scripts/build.ts b/scripts/build.ts
index 239affce9f3..3204cd6bd57 100644
--- a/scripts/build.ts
+++ b/scripts/build.ts
@@ -1,9 +1,21 @@
-import { basename } from "node:path";
+import { DefinedError } from "ajv";
+import { getStatus } from "compute-baseline";
+import stringify from "fast-json-stable-stringify";
 import { execSync } from "node:child_process";
 import fs from "node:fs";
-import stringify from "fast-json-stable-stringify";
+import { basename } from "node:path";
+import winston from "winston";
 import yargs from "yargs";
 import * as data from "../index.js";
+import { validate } from "./validate.js";
+
+const logger = winston.createLogger({
+  format: winston.format.combine(
+    winston.format.colorize(),
+    winston.format.simple(),
+  ),
+  transports: new winston.transports.Console(),
+});
 
 const rootDir = new URL("..", import.meta.url);
 
@@ -14,14 +26,23 @@ yargs(process.argv.slice(2))
     describe: "Generate the web-features npm package",
     handler: buildPackage,
   })
+  .command({
+    command: "extended-json",
+    describe: "Generate a web-features JSON file with BCD per-key statuses",
+    handler: buildExtendedJSON,
+  })
   .parseSync();
 
 function buildPackage() {
   const packageDir = new URL("./packages/web-features/", rootDir);
   const filesToCopy = ["LICENSE.txt", "types.ts", "schemas/data.schema.json"];
 
+  if (!valid(data)) {
+    logger.error("Data failed schema validation. No package built.");
+    process.exit(1);
+  }
+
   const json = stringify(data);
-  // TODO: Validate the resulting JSON against a schema.
   const path = new URL("data.json", packageDir);
   fs.writeFileSync(path, json);
   for (const file of filesToCopy) {
@@ -39,3 +60,42 @@ function buildPackage() {
     encoding: "utf-8",
   });
 }
+
+function buildExtendedJSON() {
+  for (const [id, featureData] of Object.entries(data.features)) {
+    if (
+      Array.isArray(featureData.compat_features) &&
+      featureData.compat_features.length &&
+      featureData.status
+    ) {
+      featureData.status.by_compat_key = {};
+      for (const key of featureData.compat_features) {
+        featureData.status.by_compat_key[key] = getStatus(id, key);
+      }
+    }
+  }
+
+  if (!valid(data)) {
+    logger.error("Data failed schema validation. No JSON file written.");
+    process.exit(1);
+  }
+
+  fs.writeFileSync(
+    new URL("./web-features.extended.json", rootDir),
+    stringify(data),
+  );
+}
+
+function valid(data: any): boolean {
+  const valid = validate(data);
+  if (!valid) {
+    // TODO: turn on strictNullChecks, fix all the errors, and replace this with:
+    // const errors = validate.errors;
+    const errors = (valid as any).errors as DefinedError[];
+    for (const error of errors) {
+      logger.error(`${error.instancePath}: ${error.message}`);
+    }
+    return false;
+  }
+  return true;
+}
diff --git a/scripts/schema.ts b/scripts/schema.ts
index 81a110a6a14..357bcf85a21 100644
--- a/scripts/schema.ts
+++ b/scripts/schema.ts
@@ -3,12 +3,9 @@ import fs from "node:fs";
 import path from "node:path";
 import url from 'url';
 
-import Ajv from 'ajv';
-import addFormats from 'ajv-formats';
-
+import { DefinedError } from "ajv";
 import * as data from '../index.js';
-
-import schema from '../schemas/data.schema.json' assert { type: 'json' };
+import { validate } from "./validate.js";
 
 let status: 0 | 1 = 0;
 
@@ -25,15 +22,13 @@ function checkSchemaConsistency(): void {
     }
 }
 
-function validate() {
-    const ajv = new Ajv({allErrors: true});
-    addFormats(ajv);
-
-    const validate = ajv.compile(schema);
-
+function valid() {
     const valid = validate(data);
     if (!valid) {
-        for (const error of validate.errors) {
+        // TODO: turn on strictNullChecks, fix all the errors, and replace this with:
+        // const errors = validate.errors;
+        const errors = (validate as any).errors as DefinedError[];
+        for (const error of errors) {
             console.error(`${error.instancePath}: ${error.message}`);
         }
         status = 1;
@@ -41,5 +36,5 @@ function validate() {
 }
 
 checkSchemaConsistency();
-validate();
+valid();
 process.exit(status);
diff --git a/scripts/validate.ts b/scripts/validate.ts
new file mode 100644
index 00000000000..9a21ca7fdf3
--- /dev/null
+++ b/scripts/validate.ts
@@ -0,0 +1,21 @@
+import Ajv from "ajv";
+import addFormats from "ajv-formats";
+import assert from "node:assert/strict";
+
+import * as schema from "../schemas/data.schema.json" with { type: "json" };
+
+export function validate(data: any) {
+  const ajv = new Ajv({ allErrors: true, allowUnionTypes: true });
+  addFormats(ajv);
+  // TODO: turn on strictNullChecks, fix all the errors, and replace this with:
+  // const validator = ajv.compile<WebFeaturesData>(schema);
+  const validator = ajv.compile(schema);
+
+  assert.equal(
+    validator({}),
+    false,
+    "Failed confidence check: schema validates empty object",
+  );
+
+  return validator;
+}
diff --git a/types.ts b/types.ts
index 524999a9504..c5770950ff1 100644
--- a/types.ts
+++ b/types.ts
@@ -32,7 +32,7 @@ type browserIdentifier = "chrome" | "chrome_android" | "edge" | "firefox" | "fir
 
 type BaselineHighLow = "high" | "low";
 
-interface SupportStatus {
+interface Status {
     /** Whether the feature is Baseline (low substatus), Baseline (high substatus), or not (false) */
     baseline: BaselineHighLow | false;
     /** Date the feature achieved Baseline low status */
@@ -45,6 +45,11 @@ interface SupportStatus {
     };
 }
 
+interface SupportStatus extends Status {
+    /** Statuses for each key in the feature's compat_features list, if applicable. Not available to the npm release of web-features. */
+    by_compat_key?: Record<string, Status>
+}
+
 /** Specification URL
  * @format uri
 */