first character is "
The point is it isn't valid JSON and that's why you getting an error
A simple test - click the copy button that appears under your mouse cursor when you hover over the payload in the debug sidebar. Then go to any of the hundreds of online JSON validator websites and paste it in. You will see it is not valid JSON.
this have ho results 
Please open the 'chart' file you have and copy and past the results into a reply so I can see the data you are using.
this is the result of my file, stored in file.
({"teplota":5.77586,"vlhkost":81.6777,"oblacnost":27.488888888888887,"vietor":0,"tlak":1036.17,"smer":"JZ","pocitovo":4.14,"pocasie":"01n","vychod":"06:36","zapad":"17:17","cas":"Utorok 23.2. 17:40","zrazky24":0});
Ahhh I see, In your original flow you were getting the data from the website and that is what I was working off of. So is this file what you want to parse or is it the data straight from the website?
Also please provide the flow as you have it now.
I just download file to my server, that I want to render to my weather station as a graphs.
here is my flow:
[{"id":"1a2d781c.46fa4","type":"tab","label":"Weather","disabled":false,"info":""},{"id":"e275a8a5.6029b8","type":"inject","z":"1a2d781c.46fa4","name":"make request","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"onceDelay":"","x":100,"y":80,"wires":[["aaf7ab1c.57a3e"]]},{"id":"aaf7ab1c.57a3e","type":"http request","z":"1a2d781c.46fa4","name":"","method":"GET","ret":"txt","paytoqs":false,"url":"http://meteosasova.sk/bbo_api.php","tls":"","persist":false,"proxy":"","authType":"","x":190,"y":30,"wires":[["332cb90c.a041ee"]]},{"id":"429836e1.7d4568","type":"file","z":"1a2d781c.46fa4","name":"chart","filename":"homie/homey-5ac5f38e42b2c4296e150d77/tester","appendNewline":false,"createDir":true,"overwriteFile":"true","x":380,"y":90,"wires":[["af7ad592.ac9f18"]]},{"id":"af7ad592.ac9f18","type":"debug","z":"1a2d781c.46fa4","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","x":390,"y":140,"wires":[]},{"id":"714e54e1.d9d134","type":"inject","z":"1a2d781c.46fa4","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":590,"y":20,"wires":[["2f80eb1c.584794"]]},{"id":"2f80eb1c.584794","type":"file in","z":"1a2d781c.46fa4","name":"chart","filename":"homie/homey-5ac5f38e42b2c4296e150d77/tester","format":"utf8","chunk":false,"sendError":false,"encoding":"none","x":720,"y":20,"wires":[["73162131.f881d8","aae9744e.444338"]]},{"id":"73162131.f881d8","type":"split","z":"1a2d781c.46fa4","name":"","splt":">","spltType":"str","arraySplt":1,"arraySpltType":"len","stream":false,"addname":"","x":600,"y":90,"wires":[["60d006.10541ffc"]]},{"id":"60d006.10541ffc","type":"switch","z":"1a2d781c.46fa4","name":"","property":"payload","propertyType":"msg","rules":[{"t":"cont","v":"\"({","vt":"str"},{"t":"else"}],"checkall":"true","repair":false,"outputs":2,"x":610,"y":140,"wires":[["b6c82e3e.6848d"],[]]},{"id":"b6c82e3e.6848d","type":"change","z":"1a2d781c.46fa4","name":"","rules":[{"t":"change","p":"payload","pt":"msg","from":"\"({","fromt":"str","to":"","tot":"str"},{"t":"change","p":"payload","pt":"msg","from":"});\"","fromt":"str","to":"","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":660,"y":190,"wires":[["4f96e5c5.27967c"]]},{"id":"4f96e5c5.27967c","type":"split","z":"1a2d781c.46fa4","name":"","splt":"\\n","spltType":"str","arraySplt":1,"arraySpltType":"len","stream":false,"addname":"","x":670,"y":250,"wires":[["3c4a1319.40fa1c","9e745726.41c888"]]},{"id":"3c4a1319.40fa1c","type":"json","z":"1a2d781c.46fa4","name":"","property":"payload","action":"str","pretty":false,"x":680,"y":300,"wires":[["cb3eaf48.2d056"]]},{"id":"cb3eaf48.2d056","type":"debug","z":"1a2d781c.46fa4","name":"","active":false,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","x":820,"y":300,"wires":[]},{"id":"332cb90c.a041ee","type":"split","z":"1a2d781c.46fa4","name":"","splt":"\\n","spltType":"str","arraySplt":1,"arraySpltType":"len","stream":false,"addname":"","x":220,"y":160,"wires":[["429836e1.7d4568"]]},{"id":"aae9744e.444338","type":"debug","z":"1a2d781c.46fa4","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","x":960,"y":70,"wires":[]},{"id":"9e745726.41c888","type":"debug","z":"1a2d781c.46fa4","name":"","active":false,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","x":820,"y":250,"wires":[]}]
Try this but make sure to point to the correct file;
[{"id":"f66e8a2c.747eb8","type":"inject","z":"2ed58e52.2bc8ba","name":"","repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":380,"y":100,"wires":[["52a019c2.ba757"]]},{"id":"52a019c2.ba757","type":"file in","z":"2ed58e52.2bc8ba","name":"chart","filename":"/Users/Paul/tmp/tester.txt","format":"utf8","chunk":false,"sendError":false,"encoding":"none","x":370,"y":180,"wires":[["d974618a.71486","443afdf3.b6f3ec"]]},{"id":"443afdf3.b6f3ec","type":"change","z":"2ed58e52.2bc8ba","name":"","rules":[{"t":"change","p":"payload","pt":"msg","from":"({","fromt":"str","to":"{","tot":"str"},{"t":"change","p":"payload","pt":"msg","from":"});","fromt":"str","to":"}","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":380,"y":260,"wires":[["5bb2178f.a40788","3a8741ce.13a156"]]},{"id":"3a8741ce.13a156","type":"json","z":"2ed58e52.2bc8ba","name":"","property":"payload","action":"obj","pretty":false,"x":370,"y":380,"wires":[["3ec7dd86.b125ca"]]},{"id":"3ec7dd86.b125ca","type":"debug","z":"2ed58e52.2bc8ba","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","x":630,"y":380,"wires":[]},{"id":"d974618a.71486","type":"debug","z":"2ed58e52.2bc8ba","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","x":640,"y":140,"wires":[]},{"id":"5bb2178f.a40788","type":"debug","z":"2ed58e52.2bc8ba","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","x":650,"y":260,"wires":[]}]
I have a little issue. how can I display some payload to chart? for example msg.payload.teplota to line chart?
Use a change node set to move msg.payload.teplota to msg.payload then feed to the chart
In fact, due to the fact that you are sending the data to a gauge, not a chart, then you don't need to use a Change node. You can feed the payload directly into the gauge, and in the Value Format field use
{{msg.payload.teplota}}
In addition if you want it rounded to two decimal places, for example, use
{{msg.payload.teplota | number:2}}
When it says
I assumed they meant also send to a chart ...
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