Bun

Bun is a fast, all-in-one JavaScript and TypeScript toolkit built by Oven (oven-sh). A single self-contained binary bundles a Node.js-compatible runtime, a package manager (a drop-in, dramatically faster replacement for npm/yarn/pnpm), a native bundler and single-file executable compiler, and a Jest-compatible test runner. Bun is designed as an incrementally adoptable drop-in replacement for Node.js, emphasizing startup speed, install speed, and elegant built-in APIs. It is open source, distributed as a binary via an install script, Homebrew, Docker, and npm, and is surfaced here as a Kleiner Perkins portfolio company. Bun exposes no hosted REST API; the CLI and the runtime/bundler APIs are the developer surface.

Bun is profiled on the APIs.io network. Tagged areas include Company, Developer Tools, JavaScript, TypeScript, and Runtime.

Bun’s developer surface includes documentation, API reference, getting-started guide, engineering blog, support, CLI, changelog, and 8 more developer resources.

🌐 Visit website 📡 Source on GitHub

20.0/100 emerging ▬ flat Agent 0/100 human only library Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

0 APIs

Company Developer Tools JavaScript TypeScript Runtime Package Manager BundlerTest Runner

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 20.0/100 · emerging

Contract Quality 0.0 / 25

Developer Ergonomics 11.9 / 20

Access Clarity 0.0 / 20

Operational Transparency 2.4 / 13

Contract Governance 0.0 / 12

Discoverability 5.7 / 10

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

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Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Bun Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Guides

Guides

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

CLI

Packages

SDKs

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

Support

Support

ChangeLog

ChangeLog

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: bun
name: Bun
description: Bun is a fast, all-in-one JavaScript and TypeScript toolkit built by Oven (oven-sh). A single self-contained
  binary bundles a Node.js-compatible runtime, a package manager (a drop-in, dramatically faster replacement for npm/yarn/pnpm),
  a native bundler and single-file executable compiler, and a Jest-compatible test runner. Bun is designed as an incrementally
  adoptable drop-in replacement for Node.js, emphasizing startup speed, install speed, and elegant built-in APIs. It is open
  source, distributed as a binary via an install script, Homebrew, Docker, and npm, and is surfaced here as a Kleiner Perkins
  portfolio company. Bun exposes no hosted REST API; the CLI and the runtime/bundler APIs are the developer surface.
url: https://raw.githubusercontent.com/api-evangelist/bun/refs/heads/main/apis.yml
x-type: company
x-source: kleiner-perkins-portfolio
x-tier: stub
x-tier-reason: portfolio-lead
deliveryModel:
  model: library
  open_source: false
  commercial: false
  callable_host: false
  label: Library · distributed through package registries, no callable service
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-18'
image: https://bun.com/logo.svg
tags:
- Company
- Developer Tools
- JavaScript
- TypeScript
- Runtime
- Package Manager
- Bundler
- Test Runner
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://bun.com
- type: DeveloperPortal
  url: https://bun.com/docs
- type: Documentation
  url: https://bun.com/docs
- type: APIReference
  url: https://bun.com/reference
- type: GettingStarted
  url: https://bun.com/docs/installation
- type: Guides
  url: https://bun.com/guides
- type: Blog
  url: https://bun.com/blog
- type: GitHubOrganization
  url: https://github.com/oven-sh
- type: Support
  url: https://bun.com/discord
- type: CLI
  url: cli/bun-cli.yml
- type: ChangeLog
  url: changelog/bun-changelog.yml
- type: Packages
  url: packages/bun-packages.yml
- type: SDKs
  url: packages/bun-packages.yml
- type: LLMsTxt
  url: llms/bun-llms.txt
- type: DomainSecurity
  url: security/bun-domain-security.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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