Elysia
A type-safe backend framework for TypeScript APIs with automatic documentation and validation
- Also known as
- elysia
What is Elysia?
A TypeScript framework for building backend APIs that maintains type safety across client and server boundaries, generates API documentation automatically, and validates requests at runtime. Designed for ergonomic developer experience and efficient performance.
Elysia pricing
We don't have Elysia's full plan breakdown yet (its pricing page resisted automated reading). Here's what we could confirm. Always check live pricing for exact numbers.
What Elysia 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
- TypeScript
- Server components
- -
- Streaming SSR
- -
- Built-in API / backend routes
- ✓
- First-class TypeScript
- ✓
- Fast refresh / HMR
- ✓
- Edge runtime support
- -
Platform & deployment
Independently observed- CLI
- Self-hosted
Integrations (4)
Independently observed- OpenTelemetry→•
- Next.js⇄
- Bun
- GitHub←
Security & compliance
Known vulnerabilities: 4 (4 in the last 12 months), max severity CRITICAL sourcea count reflects scale & disclosure, not quality
Elysia FAQ
Common questions about Elysia, answered from independent, dated evidence.
What is Elysia?
A server-side TypeScript framework for building type-safe APIs with exceptional performance. Built on Bun runtime, it delivers significantly faster request handling than traditional Node frameworks through advanced type inference and validation. It is indexed under Web Frameworks.
Source: https://elysiajs.com/
Is Elysia free to use?
Elysia is open source, so it can be self-hosted and used at no licence cost. It is released under the MIT licence. Pricing changes often, so verify at source before relying on it.
Source: https://elysiajs.com/
What platforms does Elysia support?
Elysia supports a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.
Source: https://elysiajs.com/
Can Elysia be self-hosted?
Yes. Elysia can be deployed cloud / SaaS, on-premise and self-hosted, so it does not have to run on the vendor's infrastructure.
Source: https://elysiajs.com/
Is Elysia open source?
Yes. Elysia is published under the MIT licence, a permissive licence that generally allows commercial use and modification. Licence terms can change between releases, so verify against the repository for the version you intend to use.
Elysia alternatives
Other web frameworks we track, ranked by the same independent score.
- Next.jsA full-stack React framework for building web applications with integrated routing, rendering, and caching.high · 77%
- FastAPIModern, high-performance Python framework for building APIsmedium · 69%
- NuxtA framework for building full-featured web applications with Vue.js, handling both frontend and backend automaticallyhigh · 78%
- DjangoA web framework for rapid development of high-quality applicationsmedium · 72%
- ExpressA minimal, unopinionated Node.js web server framework for building applications and APIshigh · 78%
- NestJSA rapidly-adopted Node.js framework for creating efficient, dependable, and scalable backend applicationshigh · 79%
The vioscaleAI 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 Elysia, not the verdict.
| Signal | Score | Weight | Contribution | Evidence |
|---|---|---|---|---|
| Package downloads | 75 | 0.17 | 13.0 | ✓ |
| Release cadence | 95 | 0.07 | 6.4 | ✓ |
| Capabilities | 58 | 0.08 | 4.8 | ✓ |
| Development activity | 27 | 0.12 | 3.2 | ✓ |
| Stars | 81 | 0.03 | 2.7 | ✓ |
| Dependent projects | 28 | 0.08 | 2.2 | ✓ |
| Integrations | 20 | 0.05 | 1.1 | ✓ |
| Security posture | 0 | 0.09 | 0.0 | - |
| Security score | 0 | 0.05 | 0.0 | - |
| Developer Q&A activity | 0 | 0.08 | 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.
Activity
| Attribute | Value | Evidence |
|---|---|---|
| Commits last 30d | 6 | mediumsource · 2026-09-10 · 65% |
Adoption
Content
| Attribute | Value | Evidence |
|---|---|---|
| Faq | 5 items | mediumsource · 2026-09-10 · 68% |
Features
| Attribute | Value | Evidence |
|---|---|---|
| Capabilities | Language: TypeScript · Api routes: Yes · Hot reload: Yes · Typescript first: Yes | mediumsource · 2026-09-10 · 60% |
Integrations
| Attribute | Value | Evidence |
|---|---|---|
| Count | 4 | mediumsource · 2026-09-10 · 60% |
Language
| Attribute | Value | Evidence |
|---|---|---|
| Primary | TypeScript | highsource · 2026-09-10 · 90% |
License
| Attribute | Value | Evidence |
|---|---|---|
| Spdx | MIT | highsource · 2026-09-10 · 99% |
Pricing
Release
Security
| Attribute | Value | Evidence |
|---|---|---|
| Vulnerabilities | Count: 4 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=elysia&per_page=100 · Last 12m: 4 · Max severity: CRITICAL | highsource · 2026-09-10 · 90% |
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