To create a small payload parser in javascript

We have 320 bits 40 bytes of info and need to extract into json variables. below link is the data format we receive into TTN The things network, then we need to output into json with relevant variables as per link below.
https://www.iotsoundsensor.com/wp-content/uploads/2021/11/310_payload_parser_manual.html
i need this done in 1 day max. My Budget is $100 max.