Zig

Zig is a general-purpose programming language and toolchain for maintaining robust, optimal, and reusable software.

https://ziglang.org/

https://ziglang.org/documentation/master/#Introduction

const std = @import("std"); const json = std.json; const payload = \\{   \\    "vals": { \\       "testing": 1, \\       "production": 42 \\   },    \\    "uptime": 9999 \\} const Config = struct { vals: struct { testing: u8, production: u8 }, uptime: u64, }; const config = x: { var stream = json.TokenStream.init(payload); const res = json.parse(Config, &stream, .{}); // Assert no error can occur since we are // parsing this JSON at comptime! break :x res catch unreachable; }; pub fn main !void { if (config.vals.production > 50) { @compileError("only up to 50 supported"); }   std.log.info("up={d}", .{config.uptime}); }