https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/bad-escaped-character-in-json-esriconfig/m-p/1356034#M82993 <P>The backslash in a JavaScript string is an escape character that is combined with the character immediately following it to represent a special character, for example \n is a newline character, and \t is a tab character.&nbsp; The parser sees the backslashes in your value, but \c isn't a valid character.</P><P>&nbsp;</P><P>To get around this, you need to escape your backslashes so that the compiler interprets them properly.&nbsp; For instance "assets\config\config.json" should instead be "assets\\config\\config.json".&nbsp; You can do this with something like:</P><LI-CODE lang="javascript">var urlParams = new URLSearchParams(window.location.search); var configPath = urlParams.get("config").replace(/\\/g, "\\\\");</LI-CODE><P>&nbsp;</P> Fri, 01 Dec 2023 23:17:28 GMT JoelBennett 2023-12-01T23:17:28Z https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/bad-escaped-character-in-json-esriconfig/m-p/1355732#M82986 <P>Hi all,</P><P>I am receiving multiple worker exceptions when the mapview loads. It does not affect anything as I believe the issue is in logger.</P><P>My site supports locale and config as querystring parameters. Adding the config parameter seems to trigger the issue. Example:&nbsp;<A href="http://localhost:5173/?locale=fr&amp;config=assets\config\config.json" target="_blank">http://localhost:5173/?locale=fr&amp;config=assets\config\config.json</A>&nbsp;causes the issue but&nbsp;<A href="http://localhost:5173/?locale=fr" target="_blank">http://localhost:5173/?locale=fr</A>&nbsp;does not. I have also tried&nbsp;<A href="http://localhost:5173/?locale=fr&amp;config=assets\config\config.json" target="_blank">http://localhost:5173/?locale=fr&amp;config=assets%5cconfig%5cconfig.json</A>&nbsp;but that made no difference. My config file still loads up fine in the javascript either way.</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Ren_Tnire_0-1701446021386.png" style="width: 772px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/87739i6E3A6E5129C0DC03/image-dimensions/772x83?v=v2" width="772" height="83" role="button" title="Ren_Tnire_0-1701446021386.png" alt="Ren_Tnire_0-1701446021386.png" /></span></P><LI-CODE lang="javascript">let globalId=0;const outgoing=new Map,configuration=JSON.parse('{"esriConfig":{"applicationName":"","applicationUrl":"http://localhost:5173/?locale=fr&amp;config=assets\\config\\config.json","assetsPath":"https://js.arcgis.com/4.28/@arcgis/core/assets","fontsUrl":"https://static.arcgis.com/fonts","geometryServiceUrl":"https://utility.arcgisonline.com/arcgis/rest/services/Geometry/GeometryServer","geoRSSServiceUrl":"https://utility.arcgis.com/sharing/rss","kmlServiceUrl":"https://utility.arcgis.com/sharing/kml","userPrivilegesApplied":true,"portalUrl":"https://nsdnr-forestry.maps.arcgis.com","routeServiceUrl":"https://route-api.arcgis.com/arcgis/rest/services/World/Route/NAServer/Route_World","workers":{"loaderConfig":{"has":{},"paths":{},"map":{},"packages":[]},"workerPath":"https://js.arcgis.com/4.28/@arcgis/core/assets/esri/core/workers/RemoteClient.js","useDynamicImport":false},"request":{"crossOriginNoCorsDomains":null,"httpsDomains":["arcgis.com","arcgisonline.com","esrikr.com","premiumservices.blackbridge.com","esripremium.accuweather.com","gbm.digitalglobe.com","firstlook.digitalglobe.com","msi.digitalglobe.com"],"interceptors":[],"maxUrlLength":2000,"priority":"high","proxyRules":[],"proxyUrl":null,"timeout":60000,"trustedServers":[],"useIdentity":true},"log":{"interceptors":[],"level":null},"defaultAssetsPath":"https://js.arcgis.com/4.28/@arcgis/core/assets","locale":"fr","has":{"esri-csp-restrictions":false,"esri-2d-debug":false,"featurelayer-pbf":true,"featurelayer-simplify-thresholds":[0.5,0.5,0.5,0.5],"featurelayer-simplify-payload-size-factors":[1,1,4],"esri-atomics":true,"esri-shared-array-buffer":false,"esri-workers-arraybuffer-transfer":true,"feature-polyline-generalization-factor":1,"host-webworker":1}},"loaderConfig":{"async":true,"isDebug":false,"locale":"fr","has":{"csp-restrictions":1,"dojo-test-sniff":0,"host-webworker":1},"map":{},"packages":[],"paths":{}},"kernelInfo":{"buildDate":"20231115","fullVersion":"4.28.10","revision":"a6fcf2901ef678ef17a528e11b93ffe09e3ec267"}}');self.esriConfig=configuration.esriConfig;const workerPath=self.esriConfig.workers.workerPath,HANDSHAKE=0,OPEN=1,OPENED=2,RESPONSE=3,INVOKE=4,ABORT=5;function createAbortError(){const e=new Error("Aborted");return e.name="AbortError",e}function receiveMessage(e){return e&amp;&amp;e.data?"string"==typeof e.data?JSON.parse(e.data):e.data:null}function invokeStaticMessage(e,o,r){const t=r&amp;&amp;r.signal,n=globalId++;return new Promise(((r,s)=&gt;{if(t){if(t.aborted)return s(createAbortError());t.addEventListener("abort",(()=&gt;{outgoing.get(n)&amp;&amp;(outgoing.delete(n),self.postMessage({type:ABORT,jobId:n}),s(createAbortError()))}))}outgoing.set(n,{resolve:r,reject:s}),self.postMessage({type:INVOKE,jobId:n,methodName:e,abortable:null!=t,data:o})}))}let workerRevisionChecked=!1;function checkWorkerRevision(e){if(!workerRevisionChecked&amp;&amp;e.kernelInfo){workerRevisionChecked=!0;const{revision:o,fullVersion:r}=configuration.kernelInfo,{revision:t,fullVersion:n,version:s}=e.kernelInfo;esriConfig.assetsPath!==esriConfig.defaultAssetsPath&amp;&amp;o!==t&amp;&amp;console.warn(`Version mismatch detected between ArcGIS Maps SDK for JavaScript modules and assets. For more information visit https://bit.ly/3QnsuSo.\nModules version: ${r}\nAssets version: ${n??s}\nAssets path: ${esriConfig.assetsPath}`)}}function messageHandler(e){const o=receiveMessage(e);if(!o)return;const r=o.jobId;switch(o.type){case OPEN:let n;function t(e){const o=n.connect(e);self.postMessage({type:OPENED,jobId:r,data:o},[o])}"function"==typeof define&amp;&amp;define.amd?require([workerPath],(e=&gt;{n=e.default||e,checkWorkerRevision(n),n.loadWorker(o.modulePath).then((e=&gt;e||new Promise((e=&gt;{require([o.modulePath],e)})))).then(t)})):"System"in self&amp;&amp;"function"==typeof System.import?System.import(workerPath).then((e=&gt;(n=e.default,checkWorkerRevision(n),n.loadWorker(o.modulePath)))).then((e=&gt;e||System.import(o.modulePath))).then(t):esriConfig.workers.useDynamicImport?import(workerPath).then((e=&gt;{n=e.default||e,checkWorkerRevision(n),n.loadWorker(o.modulePath).then((e=&gt;e||import(o.modulePath))).then(t)})):(self.RemoteClient||importScripts(workerPath),n=self.RemoteClient.default||self.RemoteClient,checkWorkerRevision(n),n.loadWorker(o.modulePath).then(t));break;case RESPONSE:if(outgoing.has(r)){const s=outgoing.get(r);outgoing.delete(r),o.error?s.reject(JSON.parse(o.error)):s.resolve(o.data)}}}self.dojoConfig=configuration.loaderConfig,esriConfig.workers.loaderUrl&amp;&amp;(self.importScripts(esriConfig.workers.loaderUrl),"function"==typeof require&amp;&amp;"function"==typeof require.config&amp;&amp;require.config(configuration.loaderConfig)),self.addEventListener("message",messageHandler),self.postMessage({type:0});</LI-CODE><P>&nbsp;</P> Fri, 01 Dec 2023 15:59:13 GMT https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/bad-escaped-character-in-json-esriconfig/m-p/1355732#M82986 René_Ténière 2023-12-01T15:59:13Z https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/bad-escaped-character-in-json-esriconfig/m-p/1356034#M82993 <P>The backslash in a JavaScript string is an escape character that is combined with the character immediately following it to represent a special character, for example \n is a newline character, and \t is a tab character.&nbsp; The parser sees the backslashes in your value, but \c isn't a valid character.</P><P>&nbsp;</P><P>To get around this, you need to escape your backslashes so that the compiler interprets them properly.&nbsp; For instance "assets\config\config.json" should instead be "assets\\config\\config.json".&nbsp; You can do this with something like:</P><LI-CODE lang="javascript">var urlParams = new URLSearchParams(window.location.search); var configPath = urlParams.get("config").replace(/\\/g, "\\\\");</LI-CODE><P>&nbsp;</P> Fri, 01 Dec 2023 23:17:28 GMT https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/bad-escaped-character-in-json-esriconfig/m-p/1356034#M82993 JoelBennett 2023-12-01T23:17:28Z https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/bad-escaped-character-in-json-esriconfig/m-p/1356756#M83012 <P>The url parameter is decoded properly within code (decodeURI() will properly return the escaped parameter). The issue is that you cannot rely on user validation. Upon further digging I have found that the applicationUrl is not uri encoded when added to the esriConfig:&nbsp;</P><LI-CODE lang="javascript">JSON.parse('{"esriConfig":{"applicationName":"","applicationUrl":"http://localhost:5173/?locale=fr&amp;config=assets\\config\\config.json",</LI-CODE><P>&nbsp;JSON.parse() does not seem to accept an escaped \ (\\).</P><P>If the input URL is:</P><LI-CODE lang="markup">http://localhost:5173/?locale=fr&amp;config=assets%5cconfig%5cconfig.json</LI-CODE><P>&nbsp;then there is no problem.</P><P>It would be proper if esri fixed the code that adds applicationUrl so that it is properly encoded, i.e. <SPAN>encodeURI(</SPAN><SPAN>window</SPAN><SPAN>.</SPAN><SPAN>location</SPAN><SPAN>.</SPAN><SPAN>href</SPAN><SPAN>)</SPAN>. You cannot rely on the fact that the client will validate the url parameter. If you look at past WAB functionality, it accepted non-encoded or escaped backslashes as config parameters.</P> Tue, 05 Dec 2023 13:37:13 GMT https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/bad-escaped-character-in-json-esriconfig/m-p/1356756#M83012 René_Ténière 2023-12-05T13:37:13Z