Express

Express is a fast, unopinionated, minimalist web framework for Node.js, providing a robust set of features for building web and mobile applications and APIs. Maintained under the OpenJS Foundation, Express is one of the most widely used HTTP server frameworks in the JavaScript ecosystem.

Express is listed with 1 API on the APIs.io network. Tagged areas include Express.js, Framework, HTTP, Middleware, and Node.js.

Express’ developer surface includes documentation, engineering blog, and 10 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

15.0/100 emerging ▬ flat Agent 1/100 human only Front door AI 1/6 silent Heartbeat 100/100 alive self hosted · MIT Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemium

1 API

Express.jsFramework HTTP Middleware Node.js Open Source Web Framework Fortune 1000

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 15.0/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 4.0 / 17

Access Clarity 1.3 / 17

Operational Transparency 2.3 / 11

Contract Governance 0.0 / 10

Discoverability 5.5 / 9

Regulatory Posture 1.8 / 15

Agent readiness — 1/100 · 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 7 / 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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

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.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes

12 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 0.0 — up to +25.0 composite points
Access Clarity scores 7.9 — up to +18.4 composite points
Developer Ergonomics scores 23.8 — up to +15.2 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/express/apis.yml: open an issue on github.com/api-evangelist/express to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

HTTP

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

Express

Express is a minimal and flexible Node.js web application framework that provides a robust set of features for web and mobile applications, including routing, middleware support...

Express API pricing

Not yet checked against Express's own pricing page. Compiled by API Evangelist on 2026-05-04; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free
Professional paid	Free
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month
Professional Tier Default: 100 requests per minute

Compiled by API Evangelist, not yet checked against Express's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Express Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Express Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Express Finops

FINOPS

Security Posture 2

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

Express Domain Security

TLSv1.3 · DNSSEC

SECURITY

Express Vulnerability Disclosure

security.txt · contact published

SECURITY

Press 5

Recent news and press coverage referencing this provider.

Press Releases

How Amex exploits new AI tools

American Express

Adobe Introduces New AI Assistant in Adobe Express that ...

American Express Global Business Travel Unveils New ...

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

License

License

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Foundation

Foundation

Source (apis.yml)

aid: express
name: Express
description: Express is a fast, unopinionated, minimalist web framework for Node.js, providing a robust set of features for
  building web and mobile applications and APIs. Maintained under the OpenJS Foundation, Express is one of the most widely
  used HTTP server frameworks in the JavaScript ecosystem.
type: Index
deliveryModel:
  model: self-hosted
  license: MIT
  license_evidence:
    repo: expressjs/express
    spdx: MIT
    stars: 69474
  open_source: true
  commercial: false
  callable_host: false
  label: Self-hosted open source · you run it yourself
  confidence: medium
  source:
  - repository-license
  generated: '2026-09-25'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/express.png
tags:
- Express.js
- Framework
- HTTP
- Middleware
- Node.js
- Open Source
- Web Framework
- Fortune 1000
tags_raw:
- Express.js
- Framework
- HTTP
- Middleware
- Node.js
- Open Source
- Web Framework
- Fortune 1000
- Open-Source
url: https://expressjs.com
created: '2025-01-01'
modified: '2026-04-28'
specificationVersion: '0.23'
apis:
- aid: express:express
  name: Express
  description: Express is a minimal and flexible Node.js web application framework that provides a robust set of features
    for web and mobile applications, including routing, middleware support, and HTTP utility methods.
  humanURL: https://expressjs.com
  tags:
  - Express.js
  - Framework
  - Node.js
  - Web Framework
  properties:
  - type: Documentation
    url: https://expressjs.com/en/4x/api.html
  - type: GettingStarted
    url: https://expressjs.com/en/starter/installing.html
  - type: GitHub
    url: https://github.com/expressjs/express
  - type: NPM
    url: https://www.npmjs.com/package/express
common:
- type: Plans
  url: plans/express-plans-pricing.yml
- type: RateLimits
  url: rate-limits/express-rate-limits.yml
- type: FinOps
  url: finops/express-finops.yml
- type: VulnerabilityDisclosure
  url: security/express-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/express-domain-security.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/express-llc
- type: Website
  url: https://expressjs.com
- type: Documentation
  url: https://expressjs.com/en/4x/api.html
- type: GitHubOrganization
  url: https://github.com/expressjs
- type: Foundation
  url: https://openjsf.org
- type: License
  url: https://github.com/expressjs/express/blob/master/LICENSE
- url: https://expressjs.com/feed.xml
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Express API — frequently asked questions

Does Express have an API?

Yes. APIs.io lists 1 API from Express, including Express.

How much does the Express API cost?

APIs.io lists 3 pricing plans for Express, with each plan's price, limits and inclusions under Pricing on this page.

Is the Express API ready for AI agents?

Express has a Kin Score of 15.0 out of 100 (emerging) and an Agent Readiness score of 0.6 (human-only), scored by API Evangelist on 2026-11-06.

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Tools for providers

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get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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