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Life & fun · June 26, 2025

I built a JSON-RPC library for Zig with compile time reflection

Doing dynamic dispatching in a strict static typing language is hard. Something as simple as, map.put("add", add); map.put("hello", hello); fn add(a: i32, b: i32) i32 { return a + b; } fn hello() []const u8 { return "Hello World"; } is impossible because the value type of key/value of the map needs to be the same but all the function types are different. Calling functions with different number of parameters, different parameter types, and different return type dynamically is difficult. Other languages either use dynamic typing, runtime reflection, macro, or passing in one big generic…

I built a JSON-RPC library for Zig with compile time reflection launched on June 26, 2025 with 13 votes, #1,425 of 7,999 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 1 year on.

Visit github.com ↗Alternativestop 18% of June 2025

In plain words

ZigJR is a JSON-RPC library for the Zig programming language that solves dynamic function dispatching in a statically-typed environment. It uses Zig's compile-time reflection capabilities to automatically determine function signatures, parameter types, and return types, then packages them into uniformly typed call objects. The library is designed for developers working with Zig who need to call functions with varying parameters and return types through a single dynamic interface.

written from the facts on this page · September 2026

From the sources

A Lightweight Zig Library for JSON-RPC 2.0. Contribute to williamw520/zigjr development by creating an account on GitHub.

In the maker’s words, at launch

Doing dynamic dispatching in a strict static typing language is hard. Something as simple as, map.put("add", add); map.put("hello", hello); fn add(a: i32, b: i32) i32 { return a + b; } fn hello() []const u8 { return "Hello World"; } is impossible because the value type of key/value of the map needs to be the…

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