# Jackson FasterXML

6 Hacker News commenters recommended Jackson FasterXML and 4 criticized it, November 2025 to November 2026. It was recommended in 4 of 13 months.

**Verdict:** Java JSON library people choose for its many configuration options and its rich API for navigating documents. The most common caveat is that it is slow, especially with large data.

## What people warn about

- Slow with large data (2 comments): "Same thing for Jackson, write you own lazy json library if the data is bigger than a few 100k." ([source](https://news.ycombinator.com/item?id=47464591)) "well yeah Jackson is slow." ([source](https://news.ycombinator.com/item?id=47460531))

## Alternatives hackers recommend

- [simdjson](https://hackerapproved.com/p/simdjson.md): 12 recommend
- [System.Text.Json](https://hackerapproved.com/p/system-text-json.md): 5 recommend

## Cite as

Hacker Approved, "Jackson FasterXML", https://hackerapproved.com/p/jackson/ (counts from 1,795,640 Hacker News comments, November 2025 to November 2026).