What is Koa?
Koa is a minimal web framework designed by the Express team, enabling smaller and more expressive web applications and APIs through async functions and improved error-handling.
What Koa does
The capabilities that matter for web frameworks, normalised so it lines up with every alternative. “-” means we haven't confirmed it, not that it's missing.
- Rendering model
- -
- File-based routing
- -
- Language
- JavaScript
- Server components
- -
- Streaming SSR
- -
- Built-in API / backend routes
- ✓
- First-class TypeScript
- -
- Fast refresh / HMR
- -
- Edge runtime support
- -
Koa alternatives
Other web frameworks we track, ranked by the same independent score.
The Vioscale score: one lens on the evidence
Not user reviews and not a paid placement: a confidence-weighted blend of the independent signals below (adoption, activity, security posture, and more), which you can sort and re-weight yourself. Vendors can correct their listing but can never move their rank, and stars are weighted low as a vanity metric. It is one way to read the evidence for Koa, not the verdict.
| Signal | Score | Weight | Contribution | Evidence |
|---|---|---|---|---|
| Capabilities | 29 | 16.00 | 462.5 | ✓ |
| Reliability | 50 | 8.00 | 400.0 | ✓ |
| Price Level | 0 | 6.00 | 0.0 | - |
| Integrations | 0 | 8.00 | 0.0 | - |
| Security Posture | 0 | 13.00 | 0.0 | - |
| Pricing Transparency | 0 | 8.00 | 0.0 | - |
Computed . Re-weight it by intent, or see the full method.
All data & sourcesshow ↓
Every value we hold, with its source, retrieval date, and confidence. This is the evidence behind the score: don't trust it, verify it.