diff --git a/libs/playlist/shared/util/src/lib/source-display/source-display.spec.ts b/libs/playlist/shared/util/src/lib/source-display/source-display.spec.ts
index d9c3001c4..0b432e309 100644
--- a/libs/playlist/shared/util/src/lib/source-display/source-display.spec.ts
+++ b/libs/playlist/shared/util/src/lib/source-display/source-display.spec.ts
@@ -111,6 +111,25 @@ describe('sourceDisplayName', () => {
         }
     });
 
+    it('drops a name holding a secret of a JSON config in the URL', () => {
+        for (const json of [
+            '{"password":"hunter2"}',
+            '{"pass\\u0077ord":"hunter2"}',
+            '{"proxy":{"upstream":"http://joe:hunter2@origin.test/a"}}',
+        ]) {
+            const url = `https://proxy.test/list?config=${encodeURIComponent(json)}`;
+            expect(sourceDisplayName({ title: 'Mine hunter2', url })).toBe(
+                'proxy.test'
+            );
+        }
+        expect(
+            sourceDisplayName({
+                title: 'Mine',
+                url: 'https://proxy.test/list?config=%7B%22hd%22%3A1%7D',
+            })
+        ).toBe('Mine');
+    });
+
     it('keeps a name that only shares a letter with a decoded password', () => {
         // `%2542` is the password as written; decoded it is just `B`.
         const url = 'https://host.test/list?password=%2542';
diff --git a/libs/playlist/shared/util/src/lib/source-display/source-display.ts b/libs/playlist/shared/util/src/lib/source-display/source-display.ts
index 502a32211..949598abe 100644
--- a/libs/playlist/shared/util/src/lib/source-display/source-display.ts
+++ b/libs/playlist/shared/util/src/lib/source-display/source-display.ts
@@ -73,6 +73,14 @@ export function sourceHost(
     return parseUrl(sourceEndpoint(playlist))?.host || null;
 }
 
+function parseJson(value: string): unknown {
+    try {
+        return JSON.parse(value);
+    } catch {
+        return null;
+    }
+}
+
 /** How deep URLs nested in the source URL are searched for secrets. */
 const MAX_SECRET_NESTING = 4;
 
@@ -100,6 +108,10 @@ function collectUrlSecrets(
         if (value === null) {
             return;
         }
+        if (/^\s*[{[]/.test(value)) {
+            visitJson(parseJson(value), 0);
+            return;
+        }
         const nested = ABSOLUTE_URL.test(value.trim()) ? parseUrl(value) : null;
         if (nested) {
             collectUrlSecrets(nested, secrets, depth + 1);
@@ -107,6 +119,28 @@ function collectUrlSecrets(
             visit(new URLSearchParams(value));
         }
     };
+    // A JSON config in a parameter: values under sensitive keys are
+    // secrets, and any other string may be a URL or a parameter list.
+    const visitJson = (value: unknown, level: number): void => {
+        if (level >= MAX_SECRET_NESTING) {
+            return;
+        }
+        if (typeof value === 'string') {
+            visitNested(value);
+        } else if (Array.isArray(value)) {
+            value.forEach((item) => visitJson(item, level + 1));
+        } else if (value && typeof value === 'object') {
+            for (const [key, inner] of Object.entries(value)) {
+                const scalar =
+                    typeof inner === 'string' || typeof inner === 'number';
+                if (scalar && isDisplaySensitiveKey(key)) {
+                    secrets.push(String(inner));
+                } else {
+                    visitJson(inner, level + 1);
+                }
+            }
+        }
+    };
     const visit = (params: URLSearchParams): void =>
         params.forEach((value, key) => {
             const normalized = decodeFully(key)
diff --git a/libs/playlist/shared/util/src/lib/source-display/strip-url-credentials.spec.ts b/libs/playlist/shared/util/src/lib/source-display/strip-url-credentials.spec.ts
index fe73a1bc0..a7a335579 100644
--- a/libs/playlist/shared/util/src/lib/source-display/strip-url-credentials.spec.ts
+++ b/libs/playlist/shared/util/src/lib/source-display/strip-url-credentials.spec.ts
@@ -118,6 +118,31 @@ describe('stripUrlCredentials', () => {
         ).toBe('https://cdn.test/files%2Flive%2Flist.m3u');
     });
 
+    it('drops a JSON value and a quoted key that name a secret', () => {
+        for (const json of [
+            '{"password":"hunter2"}',
+            '{"pass\\u0077ord":"hunter2"}',
+            '[{"auth":{"token":"hunter2"}}]',
+        ]) {
+            expect(
+                stripUrlCredentials(
+                    `https://proxy.test/list?config=${encodeURIComponent(json)}&hd=1`
+                )
+            ).toBe('https://proxy.test/list?hd=1');
+        }
+        expect(
+            stripUrlCredentials(
+                `https://proxy.test/list?note=${encodeURIComponent(
+                    "see 'token': 'hunter2'"
+                )}&hd=1`
+            )
+        ).toBe('https://proxy.test/list?hd=1');
+        // Brackets that are not JSON stay: `[1080p]` is a folder name.
+        expect(stripUrlCredentials('https://cdn.test/[1080p]/list.m3u')).toBe(
+            'https://cdn.test/[1080p]/list.m3u'
+        );
+    });
+
     it('cleans a fragment that holds a URL rather than parameters', () => {
         expect(
             stripUrlCredentials(
diff --git a/libs/playlist/shared/util/src/lib/source-display/strip-url-credentials.ts b/libs/playlist/shared/util/src/lib/source-display/strip-url-credentials.ts
index f5729c1d0..b994ed940 100644
--- a/libs/playlist/shared/util/src/lib/source-display/strip-url-credentials.ts
+++ b/libs/playlist/shared/util/src/lib/source-display/strip-url-credentials.ts
@@ -22,7 +22,10 @@ const ABSOLUTE_URL = /^[a-z][a-z0-9+.-]{0,31}:\/\//iu;
 const EMBEDDED_URL = /(?<![a-z0-9+.-])[a-z][a-z0-9+.-]{0,31}:\/\/[^\s"'<>]+/giu;
 /** `joe:hunter2@origin.test`: an authority's userinfo without a scheme. */
 const BARE_USERINFO = /(?:^|[\s/])[^\s/:@]{1,256}:[^\s/@]{0,256}@[^\s/@]/u;
-const KEYED_PAIR = /(?<![a-z0-9_.-])([a-z][a-z0-9_.-]{0,63})\s{0,8}[=:]/giu;
+// A key may be quoted, as in JSON or code: `"token": …`.
+const KEYED_PAIR =
+    /(?<![a-z0-9_.-])([a-z][a-z0-9_.-]{0,63})["']?\s{0,8}[=:]/giu;
+const JSON_SHAPED = /^[{[]/;
 
 /**
  * A nested value as it must be classified: percent-decoded one round at a
@@ -56,6 +59,18 @@ export function unwrapNestedValue(value: string): string | null {
     }
 }
 
+/** A JSON object or array, such as a config in a parameter; `[1080p]` is not. */
+function isJsonLiteral(value: string): boolean {
+    if (!JSON_SHAPED.test(value)) {
+        return false;
+    }
+    try {
+        return typeof JSON.parse(value) === 'object';
+    } catch {
+        return false;
+    }
+}
+
 /**
  * A parameter whose value must not be on screen: every key the log redactor
  * treats as sensitive, plus the short account keys (`pass`, `usr`, …).
@@ -96,7 +111,13 @@ function sanitizeNested(value: string, depth: number): string | null {
     if (looksLikeSearchParams(trimmed)) {
         return withoutSensitiveParams(new URLSearchParams(trimmed), depth + 1);
     }
-    if (BARE_USERINFO.test(decoded) || hasSensitivePair(decoded)) {
+    // JSON can spell a key so no pattern reads it (`"pass\u0077ord"`): a
+    // list has no need to show a config object, so it goes whole.
+    if (
+        isJsonLiteral(trimmed) ||
+        BARE_USERINFO.test(decoded) ||
+        hasSensitivePair(decoded)
+    ) {
         return null;
     }
     const cleaned = decoded.replace(