Fix strict json error message on Node.js 19+

closes #475

Author: dougwilson

.github/workflows/ci.yml

@@ -31,6 +31,7 @@ jobs:
         - Node.js 16.x
         - Node.js 17.x
         - Node.js 18.x
+        - Node.js 19.x
 
         include:
         - name: Node.js 0.8
@@ -113,6 +114,9 @@ jobs:
         - name: Node.js 18.x
           node-version: "18.14"
 
+        - name: Node.js 19.x
+          node-version: "19.7"
+
     steps:
     - uses: actions/checkout@v3
 

HISTORY.md

@@ -1,6 +1,7 @@
 unreleased
 ==========
 
+  * Fix strict json error message on Node.js 19+
   * deps: content-type@~1.0.5
     - perf: skip value escaping when unnecessary
   * deps: raw-body@2.5.2

lib/types/json.js

@@ -39,6 +39,9 @@ module.exports = json
 
 var FIRST_CHAR_REGEXP = /^[\x20\x09\x0a\x0d]*([^\x20\x09\x0a\x0d])/ // eslint-disable-line no-control-regex
 
+var JSON_SYNTAX_CHAR = '#'
+var JSON_SYNTAX_REGEXP = /#+/g
+
 /**
  * Create a middleware to parse JSON bodies.
  *
@@ -152,15 +155,23 @@ function json (options) {
 
 function createStrictSyntaxError (str, char) {
   var index = str.indexOf(char)
-  var partial = index !== -1
-    ? str.substring(0, index) + '#'
-    : ''
+  var partial = ''
+
+  if (index !== -1) {
+    partial = str.substring(0, index) + JSON_SYNTAX_CHAR
+
+    for (var i = index + 1; i < str.length; i++) {
+      partial += JSON_SYNTAX_CHAR
+    }
+  }
 
   try {
     JSON.parse(partial); /* istanbul ignore next */ throw new SyntaxError('strict violation')
   } catch (e) {
     return normalizeJsonSyntaxError(e, {
-      message: e.message.replace('#', char),
+      message: e.message.replace(JSON_SYNTAX_REGEXP, function (placeholder) {
+        return str.substring(index, index + placeholder.length)
+      }),
       stack: e.stack
     })
   }

test/json.js

@@ -245,7 +245,7 @@ describe('bodyParser.json()', function () {
           .post('/')
           .set('Content-Type', 'application/json')
           .send('true')
-          .expect(400, '[entity.parse.failed] ' + parseError('#rue').replace('#', 't'), done)
+          .expect(400, '[entity.parse.failed] ' + parseError('#rue').replace(/#/g, 't'), done)
       })
     })
 
@@ -273,15 +273,15 @@ describe('bodyParser.json()', function () {
           .post('/')
           .set('Content-Type', 'application/json')
           .send('true')
-          .expect(400, '[entity.parse.failed] ' + parseError('#rue').replace('#', 't'), done)
+          .expect(400, '[entity.parse.failed] ' + parseError('#rue').replace(/#/g, 't'), done)
       })
 
       it('should not parse primitives with leading whitespaces', function (done) {
         request(this.server)
           .post('/')
           .set('Content-Type', 'application/json')
           .send('    true')
-          .expect(400, '[entity.parse.failed] ' + parseError('    #rue').replace('#', 't'), done)
+          .expect(400, '[entity.parse.failed] ' + parseError('    #rue').replace(/#/g, 't'), done)
       })
 
       it('should allow leading whitespaces in JSON', function (done) {
@@ -299,7 +299,7 @@ describe('bodyParser.json()', function () {
           .set('X-Error-Property', 'stack')
           .send('true')
           .expect(400)
-          .expect(shouldContainInBody(parseError('#rue').replace('#', 't')))
+          .expect(shouldContainInBody(parseError('#rue').replace(/#/g, 't')))
           .end(done)
       })
     })