what is a JSON file

JSON (JavaScript Object Notation) is an independent data exchange format. JSON  supports text and numeric values. Binary values are not supported.

 Data structures in JSON are based on key / value pairs. The key is a string, the value can be a numerical value, a boolean value (true or false) or an object.

An JSON object is a set of key / value pairs which starts with "{" and ends with "}".

Example: file name declares as chromesettings.json

{
  "capabilities":
      [
     
        {
       "platform": "WINDOWS",
          "browserName": "chrome",
          "maxInstances": 5,
          "seleniumProtocol": "WebDriver"
        },
      ],
  "configuration":
  {
    "proxy": "org.openqa.grid.selenium.proxy.DefaultRemoteProxy",
    "maxSession": 5,
    "port": 5556,
    "host": 192.18.0.5,
    "register": true,
    "registerCycle": 5000,
    "hubPort": 4444,
    "hubHost": 192.18.0.5
  }
}

Lists are one or more values surrounded by [] and separated by ",".