This content originally appeared on DEV Community and was authored by Aleksei Aleinikov
Go’s new JSON stack landed in 2025 — but what really changed, and do you need to rewrite your code?
Here’s the short version:
•
Your old Marshal/Unmarshal still works (no big migration)
•
New helpers: MarshalWrite, UnmarshalRead for direct I/O
•
Real streaming via jsontext.Encoder/Decoder
•
Smarter field tags (inline, format:DateOnly, unknown)
•
Faster decoding + stricter defaults (catch bugs early)
Think of JSON v2 as a tightened toolkit: same foundations, but with better defaults, streaming, and performance.
Full breakdown with practical examples here:
https://levelup.gitconnected.com/json-in-2025-what-actually-changed-in-v2-and-how-to-use-it-27d99efc5fcb
This content originally appeared on DEV Community and was authored by Aleksei Aleinikov