First screen, captured 9 days ago. Open the video.

A new Go API for JSON

What HN thinks

A JSON API announcement that somehow became a referendum on whether anyone will write code by hand in nine months.

Go is great for LLM-written code
Many argue Go's simplicity, verbosity and fast compiles make it an ideal target for AI-generated code, versus slow-compiling Rust; others counter with Kotlin, C#, OCaml or Crystal.
v2 API is welcome, with quibbles
Users like encoding/json/v2 and jsontext, though some miss MarshalIndent, debate the nil-slice-as-empty default, and question why it took six years.
Marshal errors and type safety
A side debate on why Marshal returns an error: commenters cite any-typed inputs, custom MarshalJSON failures and NaN floats, while others wish for compile-time checks like Rust's serde.

Consensus: Most see the new JSON API as a solid improvement, mainly for its cleaner API rather than raw speed, and accept Go's slow, careful standard library pace.

Recommended in the comments

jsontext ↗ (library): Praised as fast, reflection-free and ideal for custom parsers with precise errors; also provides indentation.
decimal ↗ (library): Offered by its author as a way to handle arbitrary-precision JSON numbers in Go.
Crystal ↗ (tool): Suggested as a fast yet simple, enjoyable language, though noted as slow to compile.
OCaml (tool): Recommended for combining very fast compile times with fast runtime and strong types.

Summarised by Claude from the comment thread 8 days ago.

Points: 373
Comments: 189
Best rank: #2
Posted: 2026-11-04 by olexsmir
Category: Programming

go golang json encoding-json-v2 standard-library api-design

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