Manifest.json Unexpected Token

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Hello I pushed a react/express project up to heroku ( and received the following errors in the console: Chrome console error messages

I tried looking up this error and it seems that I need to change something in my manifest.json file but I'm not sure. Any advice would help. Here's my manifest file:

  "short_name": "React App",
  "name": "Create React App Sample",
  "icons": [
      "src": "favicon.ico",
      "sizes": "64x64 32x32 24x24 16x16",
      "type": "image/x-icon"
  "start_url": ".",
  "display": "standalone",
  "theme_color": "#000000",
  "background_color": "#ffffff"

And also my project on Github:

This error means that the request to manifest.json does not return a valid JSON response. Probably it returns an HTML, given the fact that it fails because of a starting <.

Be sure to link the manifest.json correctly and make sure to preserve its integrity in the deployment process. Try to navigate to http://yoururl/manifest.json and check the result.

EDIT1: it seems like your link to the manifest is broken. In , try replacing

<link rel="manifest" href="%PUBLIC_URL%/manifest.json" />


<link rel="manifest" href="manifest.json" />

EDIT2: Just checked your Heroku link and can confirm the error. Your page tries to find the manifest.json under the path /cat-cards/manifest.json which is wrong. It should only be manifest.json

Manifest.json Unexpected Token, Manifest: Line: 1, column: 1, Unexpected token. Looks like my manifest.json file is not getting read somehow, despite being physically in place� Manifest: Line: 1, column: 1, Unexpected token. and the lighthouse audit scores Performance 18 and PWA 31, and the rest of the scores are green. Does anyone have any insight into optimizing an Ionic app for PWA status? I have followed several tutorials to no avail and its driving me crazy. here is a screenshot of the audit

I added this change "/cat-cards/" in my server.js file so now it's app.use("/cat-cards/", express.static("client/build"));. Adding that change and pushing to Heroku made my website work. This helped me:

Manifest: Line: 1, column: 1, Unexpected token., line 1 column 1 unexpected token". I tried some lints and my code is ok, but still getting this error. In my project i have three files: manifest.json: vendor.43103173.js:1 Uncaught SyntaxError: Unexpected token < with subsequent one saying: Uncaught TypeError: Cannot read property 'call' of undefined at n ((index):15) at Object.0 (app.e637b463.js:40) at n ((index):15) at window.webpackJsonp ((index):15) at app.e637b463.js:1

I had a similar issue. I'll add it since this is the SO post I ended up at while trying to figure it out. I'd included some generated favicon markup to my "JS not allowed" file. My manifest.json is in my src/ directory, so the pasted in markup was referencing a manifest that wasn't in my public root. The boilerplate code then returned the "JS not allowed here" EJS HTML as the actual return value for the manifest.json, so the browser saw it as malformed JSON... Not ideal.

So, if your router is going to return this sort of thing for bad HTTP requests, like Ant Design Pro does, it could be your problem.

Siemens PLM Community, an image asset but the console of my chrome is showing this error: "Uncaught SyntaxError: Unexpected token :" on manifest.json:2 I think thi. >> JSON.parse([ 'foo' ].to_json).first => "foo" When you do that, remember to select the record from the array after parsing (e.g. via first).. How to work around the problem

yeah I faced this problem and struggled a lot with it then I follow This helped me: link. it definitely works. I am thankful to the person who shares this link.

manifest is not valid json. line 1 column 1 unexpected token � Issue , How to fix Unexpected Token in JSON error - Duration: 5:10. Dave Ceddia 100,678 views � 5 Duration: 1:00 Posted: Jun 8, 2019 Every app has a JSON-formatted manifest file, named manifest.json, that provides important information. Field summary. The following code shows the supported manifest fields for Apps, with links to the page that discusses each field.

Syntax Error in manifest.json � Issue #183 � symfony/webpack , keep getting this error: "Manifest is not valid JSON. Line: 1, column: 1, Unexpected token." i don't understand what the issue is with my code? here is what i have� Dismiss Join GitHub today. GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

PWA Manifest Line 1, Column 1, Unexpected Token, keep getting this error: "Manifest is not valid JSON. Line: 1, column: 1, Unexpected token." i don't understand what the issue is with my code? here is what i have� As of 2019.3, your manifest.json file should not contain any references to the com.unity.package-manager-ui package. You can either reset your project’s package configuration or remove the following line from the manifest’s dependencies list: "com.unity.package-manager-ui": "2.1.1",

Manifest is not valid JSON. Line: 1, column: 1, Unexpected token, I am trying to optimize my app with lighthouse I have added <link rel="manifest" href="./manifest.json"> to the index.html then i have� They both say "Unexpected token '/u0000' at 1:1" but in different .json files. Summary: - While trying to open a moved project on another computer than the "origin computer" resulted in it not being able to update to the newest unity release.

Manifest is not valid JSON. Line: 1, column: 1, Unexpected token, Failed to resolve packages: The file [E:\\Work\\<project-name>\\Packages\\manifest.json] is not valid JSON: Unexpected token '' at 1:1 { ^. No

  • Usually such errors mean the JSON parsed is not valid JSON. A quick check of the file you linked seems to suggest it is valid JSON. Is it possible the manifest.json is changed somehow during the deploy process?
  • "Unexpected token <" usually means you're trying to parse HTML instead of JSON. Looking at the data returned by the server for you can see that that's exactly what's happening. The server is returning an HTML document instead of your JSON file. (It's doing the same thing for your .js and .css files.)
  • I just got the same error and after some hours I fixed it changing the start_url in the manifest.json to "start_url": "./index.html",
  • I changed the link to just manifest.json and it removed the error message about the manifest file but looking at the console now in my recently deployed heroku site I still get the first two errors in this picture: Any ideas on how to remove the uncaught syntax error?
  • you have to fix the links to your javascript files aswell
  • I'm not sure if I'm looking in the right place but could you clarify where I can find those javascript links? I'm assuming it's in the client/build/index.html file where the manifest link was in but I was not able to find javascript links in it.
  • Actually removing homepage from package.json fixes it.
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