diff --git a/src/cliproxy/auth/__tests__/oauth-trace-redactor.test.ts b/src/cliproxy/auth/__tests__/oauth-trace-redactor.test.ts
index beec9578..8b48261c 100644
--- a/src/cliproxy/auth/__tests__/oauth-trace-redactor.test.ts
+++ b/src/cliproxy/auth/__tests__/oauth-trace-redactor.test.ts
@@ -51,6 +51,40 @@ describe('redactString', () => {
   test('empty input passthrough', () => {
     expect(redactString('')).toBe('');
   });
+
+  test('redacts JSON-style token payloads in plain strings', () => {
+    const out = redactString(
+      '{"access_token":"AT_SECRET","refresh_token":"RT_SECRET","token":"TOKEN_SECRET"}'
+    );
+    expect(out).not.toContain('AT_SECRET');
+    expect(out).not.toContain('RT_SECRET');
+    expect(out).not.toContain('TOKEN_SECRET');
+    expect(out).toContain(REDACTED_PLACEHOLDER);
+  });
+
+  test('preserves JSON-style separator spacing while redacting token payloads', () => {
+    const out = redactString('{"access_token" : "AT_SECRET"}');
+    expect(out).not.toContain('AT_SECRET');
+    expect(out).toContain(`"access_token" : "${REDACTED_PLACEHOLDER}"`);
+  });
+
+  test('redacts line-leading key/value formats', () => {
+    const out = redactString(
+      'access_token=AT_SECRET refresh_token=RT_SECRET client_secret: CS_SECRET'
+    );
+    expect(out).not.toContain('AT_SECRET');
+    expect(out).not.toContain('RT_SECRET');
+    expect(out).not.toContain('CS_SECRET');
+    expect(out).toContain(`access_token=${REDACTED_PLACEHOLDER}`);
+    expect(out).toContain(`refresh_token=${REDACTED_PLACEHOLDER}`);
+    expect(out).toContain(`client_secret: ${REDACTED_PLACEHOLDER}`);
+  });
+
+  test('preserves URL-style suffixes in line-leading key/value snippets', () => {
+    const out = redactString('access_token=AT_SECRET&keep=1');
+    expect(out).not.toContain('AT_SECRET');
+    expect(out).toBe(`access_token=${REDACTED_PLACEHOLDER}&keep=1`);
+  });
 });
 
 describe('redactUrl', () => {
diff --git a/src/cliproxy/auth/oauth-trace/redactor.ts b/src/cliproxy/auth/oauth-trace/redactor.ts
index 328d9744..62c74902 100644
--- a/src/cliproxy/auth/oauth-trace/redactor.ts
+++ b/src/cliproxy/auth/oauth-trace/redactor.ts
@@ -40,12 +40,34 @@ const QUERY_PARAM_REGEX = new RegExp(
 
 const BEARER_REGEX = /Bearer\s+[A-Za-z0-9._\-~+/=]+/gi;
 
+const KV_SEPARATORS = String.raw`(?:=|:)`;
+const VALUE_FRAGMENT = String.raw`[^\s,;&\]}\"']+`;
+const STRING_KV_KEYS = [...SENSITIVE_QUERY_KEYS, 'token'].filter((key) => key !== 'authorization');
+const SENSITIVE_KEY_GROUP = `(${STRING_KV_KEYS.join('|')})`;
+const LEADING_KV_REGEX = new RegExp(
+  String.raw`(^|\s)${SENSITIVE_KEY_GROUP}(\s*${KV_SEPARATORS}\s*)${VALUE_FRAGMENT}`,
+  'gi'
+);
+const QUOTED_JSON_KV_REGEX = new RegExp(
+  String.raw`([\"'])${SENSITIVE_KEY_GROUP}\1(\s*:\s*)([\"'])(?:\\.|(?!\4).)*?\4`,
+  'gi'
+);
+
 /** Redact sensitive query-param values inside any string. Idempotent. */
 export function redactString(s: string): string {
   if (!s) return s;
   return s
     .replace(QUERY_PARAM_REGEX, (_full, key) => `${key}=${REDACTED}`)
-    .replace(BEARER_REGEX, `Bearer ${REDACTED}`);
+    .replace(BEARER_REGEX, `Bearer ${REDACTED}`)
+    .replace(
+      QUOTED_JSON_KV_REGEX,
+      (_full, quoteKey, key, separator, quoteVal) =>
+        `${quoteKey}${key}${quoteKey}${separator}${quoteVal}${REDACTED}${quoteVal}`
+    )
+    .replace(
+      LEADING_KV_REGEX,
+      (_full, prefix, key, separator) => `${prefix}${key}${separator}${REDACTED}`
+    );
 }
 
 /** Redact a parsed URL by name; returns redacted href or original on parse error. */