# ajson > Executes JSONPath on JSON objects. > More information: . - Read JSON from a file and execute a specified JSONPath expression: `ajson '{{$..json[?(@.path)]}}' {{path/to/file.json}}` - Read JSON from `stdin` and execute a specified JSONPath expression: `cat {{path/to/file.json}} | ajson '{{$..json[?(@.path)]}}'` - Read JSON from a URL and evaluate a specified JSONPath expression: `ajson '{{avg($..price)}}' '{{https://example.com/api/}}'` - Read some simple JSON and calculate a value: `echo '{{3}}' | ajson '{{2 * pi * $}}'`