The article critiques the design decision in JSON and other programming languages that disallows trailing commas in data structures, arguing that it makes code maintenance more difficult. The author demonstrates how allowing trailing commas would simplify common operations like adding or removing elements, and points out similar issues in languages like Haskell and TLA+. The piece highlights a small but impactful design choice that affects developer experience in multiple programming languages.
Background
JSON (JavaScript Object Notation) is a widely used data interchange format that is both human-readable and machine-parseable. The debate over trailing commas in programming languages has been ongoing for years, with some languages allowing them while others strictly forbid them.
- Source
- Lobsters
- Published
- Jun 11, 2026 at 12:49 AM
- Score
- 5.0 / 10