Chai Assertion Library (Chai.js)
UK
The table below provides summary statistics and salary benchmarking for jobs requiring Chai skills. It covers permanent job vacancies from the 6 months leading up to 1 January 2026, with comparisons to the same periods in the previous two years.
| 6 months to 1 Jan 2026 |
Same period 2025 | Same period 2024 | |
|---|---|---|---|
| Rank | - | 706 | 696 |
| Rank change year-on-year | - | -10 | +213 |
| Permanent jobs citing Chai | 0 | 5 | 17 |
| As % of all permanent jobs in the UK | - | 0.009% | 0.033% |
| As % of the Libraries, Frameworks & Software Standards category | - | 0.042% | 0.13% |
| Number of salaries quoted | 0 | 4 | 16 |
| 10th Percentile | - | £68,875 | £48,125 |
| 25th Percentile | - | £78,438 | £56,250 |
| Median annual salary (50th Percentile) | - | £87,500 | £67,500 |
| Median % change year-on-year | - | +29.63% | +22.73% |
| 75th Percentile | - | £91,250 | £74,063 |
| 90th Percentile | - | - | £115,000 |
| UK excluding London median annual salary | - | £65,000 | £57,500 |
| % change year-on-year | - | +13.04% | +4.55% |
All Software Libraries and Frameworks
UK
Chai falls under the Software Libraries and Frameworks category. For comparison with the information above, the following table provides summary statistics for all permanent job vacancies requiring technical specification, industry standards, software libraries and framework skills.
| Permanent vacancies with a requirement for technical specification, industry standards, software libraries and framework skills | 7,011 | 11,847 | 12,994 |
| As % of all permanent jobs advertised in the UK | 11.85% | 21.45% | 25.32% |
| Number of salaries quoted | 5,218 | 7,037 | 10,585 |
| 10th Percentile | £35,000 | £39,900 | £41,250 |
| 25th Percentile | £50,000 | £50,000 | £50,000 |
| Median annual salary (50th Percentile) | £65,000 | £65,000 | £65,000 |
| Median % change year-on-year | - | - | -3.70% |
| 75th Percentile | £85,000 | £85,000 | £85,000 |
| 90th Percentile | £110,000 | £108,750 | £106,289 |
| UK excluding London median annual salary | £57,500 | £57,500 | £57,500 |
Chai
Job Vacancy Trend
Historical trend showing the proportion of permanent IT job postings citing Chai relative to all permanent IT jobs advertised.
Chai
Salary Trend
Salary distribution trend for jobs in the UK citing Chai.
