tinygo | Go compiler for small places. Microcontrollers, WebAssembly (WASM/WASI), and command-line tools. Bas | Binary Executable Format library

1000/65535 is an integer division and will result in 0. It doesn't matter if you convert the result to float64, then it'll be 0.0.

Use floating point constant(s):

tl;dr: basically yes, but you might have to port your program.

I wonder if it is possible to use TinyGo to compile go into small binary for ARM/Linux system?

Yes (reference: https://tinygo.org/docs/guides/linux/)

TinyGo also lets you compile programs for Linux systems, both 32-bit and 64-bit, on both x86 and ARM architectures.

For cross compiling, you can use GOOS and GOARCH as usual.

For example:

Decoding and getting the name part is easy. But this does not ensure the token is valid, meaning the owner of the token is truly what the name says!

JWT tokens just contain the base64 encoded forms of a header, payload and signature parts, connected with a .. So just split the token by ., decode the base64 string and you may use json.Unmarshal() to convert the header and playload parts to maps or structs.

You must verify the signature to ensure the name is valid. If you don't perform signature verification, a token may easily be forged to pose as anyone. Signature verification is exactly what JWT libs do (besides parsing and generating tokens). How to do that, check the sources of JWT libs. I also believe there are open-source libs that process JWT tokens that also work with tiny-go.

Example code to decode the parts and print the name: