🌀 JSON v2 in Go (2025): What Actually Changed

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

Print Share Comment Cite Upload Translate Updates

APA

Aleksei Aleinikov | Sciencx (2025-08-21T03:39:32+00:00) 🌀 JSON v2 in Go (2025): What Actually Changed. Retrieved from https://www.scien.cx/2025/08/21/%f0%9f%8c%80-json-v2-in-go-2025-what-actually-changed/

MLA

" » 🌀 JSON v2 in Go (2025): What Actually Changed." Aleksei Aleinikov | Sciencx - Thursday August 21, 2025, https://www.scien.cx/2025/08/21/%f0%9f%8c%80-json-v2-in-go-2025-what-actually-changed/

HARVARD

Aleksei Aleinikov | Sciencx Thursday August 21, 2025 » 🌀 JSON v2 in Go (2025): What Actually Changed., viewed ,<https://www.scien.cx/2025/08/21/%f0%9f%8c%80-json-v2-in-go-2025-what-actually-changed/>

VANCOUVER

Aleksei Aleinikov | Sciencx - » 🌀 JSON v2 in Go (2025): What Actually Changed. [Internet]. [Accessed ]. Available from: https://www.scien.cx/2025/08/21/%f0%9f%8c%80-json-v2-in-go-2025-what-actually-changed/

CHICAGO

" » 🌀 JSON v2 in Go (2025): What Actually Changed." Aleksei Aleinikov | Sciencx - Accessed . https://www.scien.cx/2025/08/21/%f0%9f%8c%80-json-v2-in-go-2025-what-actually-changed/

IEEE

" » 🌀 JSON v2 in Go (2025): What Actually Changed." Aleksei Aleinikov | Sciencx [Online]. Available: https://www.scien.cx/2025/08/21/%f0%9f%8c%80-json-v2-in-go-2025-what-actually-changed/. [Accessed: ]

rf:citation

» 🌀 JSON v2 in Go (2025): What Actually Changed | Aleksei Aleinikov | Sciencx | https://www.scien.cx/2025/08/21/%f0%9f%8c%80-json-v2-in-go-2025-what-actually-changed/ |

Please log in to upload a file.

There are no updates yet.
Click the Upload button above to add an update.

You must be logged in to translate posts. Please log in or register.