chai
BDD/TDD assertion library for node.js and the browser. Test framework agnostic.
Overview
There's no cost to use chai at all — it's free, full stop.
chai is a standout performer on our rating metric, scoring 4.5 out of 5 on our rating metric.
Over the period tracked, chai has seen rapid user growth, expanding roughly 122% over the past 2 years.
across all 3 metrics tracked here, chai outperforms the testing frameworks average.
chai dates back to 2011, making it one of the more established names in testing frameworks.
Usage over time
By the numbers
chai compared to the field
| Feature | chai | Testing Frameworks average |
|---|---|---|
| Weekly Downloads | 196,196,190 | 131,784,493 |
| Dependent Packages | 10,608 | 6,610 |
| Popularity score | 4.5 / 5 | 4.4 / 5 |
Pros and cons
Strengths
- Comes out ahead on weekly downloads — 196,196,190 against a category average of 131,784,493.
- Comes out ahead on dependent packages — 10,608 against a category average of 6,610.
- Popularity score leads the category average: 4.5 / 5 vs. 4.4 / 5.
- Free to use, with no paid tier required to get started.
Watch-outs
- Growing fast enough that current figures may shift quickly — verify before relying on them.
Quick answers
Is chai free to use?
Yes — chai is free, with no paid tier required to get started.
Is chai good? What's its rating?
chai scores 4.5 out of 5 on our rating metric, versus a Testing Frameworks category average of 4.4.
How many people use chai?
chai has roughly 196.2M users/stars tracked, compared to a category average of 131.8M.
When was chai founded?
chai was founded in 2011, making it 15 years old.
Is chai growing?
Yes — usage is up roughly 122% over the past 2 years.
Ready to see chai for yourself?
Opens the official site in a new tab.