json-as/assembly/util/ptrToStr.ts

The only JSON library you'll need for AssemblyScript. SIMD enabled

// @ts-ignore: decorator
@inline export function ptrToStr(start: usize, end: usize): string {
  const size = end - start;
  const out = __new(size, idof<string>());
  memory.copy(out, start, size);
  return changetype<string>(out);
}