Question 1

Is ujson still maintained in 2024?

Accepted Answer

Yes, but only in maintenance mode. Critical bugs and security issues are fixed, and support for new Python versions is added, but no new features are developed. The project recommends migrating to orjson for active development.

Question 2

How does ujson compare to orjson for speed?

Accepted Answer

Benchmarks show orjson is significantly faster, with up to 79,569 calls/sec for encoding arrays of doubles versus ujson's 18,282. For most use cases, orjson offers better performance and security, making it the preferred choice for new projects.

Question 3

Can I use ujson as a drop-in replacement for Python's json module?

Accepted Answer

Absolutely. UltraJSON is designed to be API-compatible, so you can replace 'import json' with 'import ujson' and use the same dumps and loads functions without modifying your code, providing an instant performance boost.

Question 4

How to handle UTF-8 characters with ujson?

Accepted Answer

Set ensure_ascii=False when encoding to output UTF-8 directly. For example, ujson.dumps("åäö", ensure_ascii=False) returns '"åäö"' instead of escaped Unicode sequences, saving space and improving readability.

Question 5

What are the security risks with ujson?

Accepted Answer

The C-based architecture makes it prone to buffer overflow vulnerabilities if modified, as stated in the README. While critical issues are fixed, using it in security-sensitive applications requires caution due to its inherent design limitations.

Question 6

How to install ujson on different operating systems?

Accepted Answer

Use pip install ujson, which works on Windows, Linux, and macOS via PyPI. For source builds, ensure a C compiler is available and set environment variables like UJSON_BUILD_DC_INCLUDES for custom linking, as detailed in the README.

UltraJSON

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