From 6d5e6fe711cda884b674c7f519a1bf4386ea9a01 Mon Sep 17 00:00:00 2001
From: Vladimir Grichina <vgrichina@gmail.com>
Date: Thu, 5 Oct 2023 13:35:20 -0700
Subject: [PATCH] Detect quoted strings and unquoted numbers as JSON

---
 test/is-json.test.js | 3 +++
 utils/is-json.js     | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/test/is-json.test.js b/test/is-json.test.js
index 4d34e93..1e8b131 100644
--- a/test/is-json.test.js
+++ b/test/is-json.test.js
@@ -6,6 +6,9 @@ const isJSON = require('../utils/is-json');
 
 test('empty is not JSON', async t => t.false(isJSON(Buffer.from([]))));
 test('binary is not JSON', async t => t.false(isJSON(Buffer.from([1, 2, 3]))));
+test('quoted string is JSON', async t => t.true(isJSON(Buffer.from('"Hello, World!"'))));
+test('quoted integer is JSON', async t => t.true(isJSON(Buffer.from('"12345"'))));
+test('arbitrary integer is JSON', async t => t.true(isJSON(Buffer.from('12345'))));
 test('arbitrary string is not JSON', async t => t.false(isJSON(Buffer.from('Hello, World!'))));
 test('should detect JSON object', async t => t.true(isJSON(Buffer.from('{}'))));
 test('should detect JSON object with trailing whitespace', async t => t.true(isJSON(Buffer.from('       {}   '))));
diff --git a/utils/is-json.js b/utils/is-json.js
index 516495d..fa4dc7f 100644
--- a/utils/is-json.js
+++ b/utils/is-json.js
@@ -2,7 +2,7 @@ function isJSON(buffer) {
     try {
         const MAX_WHITESPACE = 1000;
         const startSlice = buffer.slice(0, MAX_WHITESPACE + 1).toString('utf8').trim();
-        if (startSlice.startsWith('{') || startSlice.startsWith('[')) {
+        if (/^\s*[\[\{"\d]/.test(startSlice)) {
             JSON.parse(buffer.toString('utf8'));
             return true;
         }