Ignore BOM char (#5)

* add bom test

* add bom check

Author: Eomm

index.js

@@ -17,6 +17,11 @@ function parse (text, reviver, options) {
   const protoAction = options.protoAction || 'error'
   const constructorAction = options.constructorAction || 'error'
 
+  // BOM checker
+  if (text && text.charCodeAt(0) === 0xFEFF) {
+    text = text.slice(1)
+  }
+
   // Parse normally, allowing exceptions
   const obj = JSON.parse(text, reviver)
 

test.js

@@ -363,3 +363,13 @@ test('safeParse', t => {
 
   t.end()
 })
+
+test('parse string with BOM', t => {
+  const theJson = { hello: 'world' }
+  const buffer = Buffer.concat([
+    Buffer.from([239, 187, 191]), // the utf8 BOM
+    Buffer.from(JSON.stringify(theJson))
+  ])
+  t.deepEqual(j.parse(buffer.toString()), theJson)
+  t.end()
+})