“SyntaxError: Unexpected token < in JSON at position 0”

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rm -rf node_modules
npm install

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return new JavaScriptSerializer().Serialize("hello");

string H = "hello";
return new JavaScriptSerializer().Serialize(H);

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var string = "some string";
JSON.parse(string)

var invalidJSON= '{"foo" : "bar", "missedquotehere : "value" }';
JSON.parse(invalidJSON)

VM598:1 Uncaught SyntaxError: Unexpected token v in JSON at position 36

var validJSON= '{"foo" : "bar", "missedquotehere : "value" }';
JSON.parse(validJSON)

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ReactDOM.render(
    <CommentBox data="/api/comments" pollInterval={2000}/>,
    document.getElementById('content')
);

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<?xml version="1.0" encoding="UTF-8"?>

<configuration>
    <system.webServer>
        <rewrite>
        <rules>
        <clear />

        <!-- ignore static files -->
        <rule name="AngularJS Conditions" stopProcessing="true">
        <match url="(app/.*|css/.*|fonts/.*|assets/.*|images/.*|js/.*|api/.*)" />
        <conditions logicalGrouping="MatchAll" trackAllCaptures="false" />
        <action type="None" />
        </rule>

        <!--remaining all other url's point to index.html file -->
        <rule name="AngularJS Wildcard" enabled="true">
        <match url="(.*)" />
        <conditions logicalGrouping="MatchAll" trackAllCaptures="false" />
        <action type="Rewrite" url="index.html" />
        </rule>

        </rules>
        </rewrite>
    </system.webServer>
</configuration>

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 let headers = new Headers({
        'Content-Type': 'application/json',
        **Accept**: 'application/json'
    });

axios({
  method:'get',
  url:'http://  ',
 headers: {
         'Content-Type': 'application/json',
        Accept: 'application/json'
    },
  responseType:'json'
})

 $.ajax({
      url: this.props.url,
      dataType: 'json',
**headers: { 
          'Content-Type': 'application/json',
        Accept: 'application/json'
    },**
      cache: false,
      success: function (data) {
        this.setState({ data: data });
      }.bind(this),
      error: function (xhr, status, err) {
        console.error(this.props.url, status, err.toString());
      }.bind(this)
    });
  },

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'/theRouteIWant&someVar=Some value to send'

'/theRouteIWant?someVar=Some value to send'
               ^

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'/:url(app|assets|stuff|etc)';

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{
    "data": [{
        "code": "1",
        "message": "This message has "unescaped" quotes, which is a JSON syntax error."
    }]
}

<b>Notice</b>:  Undefined variable: something in <b>/path/to/some-api-controller.php</b> on line <b>99</b><br />
{
    "success": false,
    "data": [{ ... }]
}

/**
 * Track Incomplete XHR Requests
 * 
 * Extend httpInterceptor to track XHR completions and keep a queue 
 * of our HTTP requests in order to find if any are incomplete or 
 * never finish, usually this is the source  of the issue if it's 
 * XHR related
 */
angular.module( "xhrErrorTracking", [
        'ng',
        'ngResource'
    ] )
    .factory( 'xhrErrorTracking', [ '$q', function( $q ) {
        var currentResponse = false;

        return {
            response: function( response ) {
                currentResponse = response;
                return response || $q.when( response );
            },
            responseError: function( rejection ) {
                var requestDesc = currentResponse.config.method + ' ' + currentResponse.config.url;
                if ( currentResponse.config.params ) requestDesc += ' ' + JSON.stringify( currentResponse.config.params );

                console.warn( 'JSON Errors Found in XHR Response: ' + requestDesc, currentResponse );

                return $q.reject( rejection );
            }
        };
    } ] )
    .config( [ '$httpProvider', function( $httpProvider ) {
        $httpProvider.interceptors.push( 'xhrErrorTracking' );
    } ] );

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public Dictionary<string, int> Clients { get; set; }
public int CRCount
{
    get
    {
        var count = 0;
        //throws when Clients is null
        foreach (var c in Clients) {
            count += c.Value;
        }
        return count;
    }
}

public Dictionary<string, int> Clients { get; set; }
public int CRCount
{
    get
    {
        var count = 0;
        if (Clients != null) {
            foreach (var c in Clients) {
                count += c.Value;
            }
        }
        return count;
    }
}

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//comments here will not be parsed and throw error

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<?php{username: 'Some'}

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homepage: "www.example.com"

hompage: ""   

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 fetch(`/api.github.com/users/${login}`)
    .then(response => response.json())
    .then(setData);
 

 fetch(`/api.github.com/users/${login}`)
    .then(response => response.text())
    .then(text => console.log(text))
    .then(setData);
 

 fetch(`https://api.github.com/users/${login}`)
    .then(response => response.json())
    .then(setData)
    .catch(error => (console.log(error)));
 

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  fetch(api_url + '/database', {
    method: 'POST', // or 'PUT'
    headers: {
     'Content-Type': 'application/json'
    },
    body: qrdata //notice that it is not qr but qrdata
  })
  .then((response) => response.json())
  .then((data) => {
    console.log('Success:', data);
  })  
  .catch((error) => {
  console.error('Error:', error);  });

async function postQRData(qr) {

  let qrdata = qr; //this was added to fix it!
  //then fetch was here
}