give out .json and .csv, not only .ndjson

index.ts

@@ -1,5 +1,5 @@
 import { parseHTML } from "linkedom"
-import { ndjsonToJson, prettyStringify, requireBasicAuth, tripleBool, type Change, type Entry } from "./lib";
+import { jsonToCsv, ndjsonToJson, prettyStringify, requireBasicAuth, tripleBool, type Change, type Entry } from "./lib";
 import * as fs from "fs/promises"
 import { existsSync } from "fs";
 import { $ } from "bun"
@@ -193,6 +193,18 @@ export class ClientResponse extends Response {
 Bun.serve({
   routes: {
     "/": () => new ClientResponse("Sheets v2"),
+    "/artists.json": async () => ClientResponse.json(
+      ndjsonToJson((await fs.readFile("artists.ndjson")).toString("utf8"))
+    ),
+    "/artists.csv": async () => new ClientResponse(
+        jsonToCsv(
+          ndjsonToJson((await fs.readFile("artists.ndjson")).toString("utf8")
+        )
+      ), {
+      headers: {
+        "Content-Type": "text/csv"
+      }
+    }),
     "/artists.ndjson": async () => new ClientResponse(await fs.readFile("artists.ndjson")),
     "/th_artists.ndjson": async () => new ClientResponse(await fs.readFile("th_artists.ndjson")),
     "/ignore-th/:id": async (req) => {

lib.ts

@@ -17,6 +17,20 @@ export const thIgnore = [
 	"bpmkeytracker",
 ]
 
+export function jsonToCsv(data: unknown|unknown[]) {
+  const arr = Array.isArray(data) ? data : [data];
+  const headers = [...new Set(arr.flatMap(o => Object.keys(o)))];
+
+  const escape = (v: string )=>
+    `"${String(v ?? "").replace(/"/g, '""')}"`;
+
+  const rows = arr.map(o =>
+    headers.map(h => escape(o[h])).join(",")
+  );
+
+  return [headers.join(","), ...rows].join("\n");
+}
+
 export enum TripleBool {
   MOSTLY = 2,
   YES = 1,