You can build from source or download a binary from the releases page. To build from source simply clone the repo and run go build main.go
The program accepts json input from a file, from stdin, or as a string of text. You can specify a file like so:
./jsonparse --file <path to file>
You can also pass in input by piping data, for example cat test.json | ./jsonparse or simply running ./jsonparse and typing in the json input.
If pasing in a json string directly you can do so like: ./jsonparse {"key":"value"}