TypeScript

TypeScript is a strongly typed programming language that builds on JavaScript, adding optional static type checking and other features. Developed and maintained by Microsoft, TypeScript compiles to plain JavaScript and is widely used for large-scale web applications, Node.js services, and developer tooling. The TypeScript Compiler API and Language Service API enable programmatic compilation, type checking, code transformation, and IDE integrations.

TypeScript publishes 3 APIs on the APIs.io network. Tagged areas include Compiler, JavaScript, Language Service, Programming Language, and Static Typing.

The TypeScript catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

TypeScript’s developer surface includes developer portal, getting-started guide, support, documentation, engineering blog, release notes, and 23 more developer resources.

🌐 Visit website 📡 Source on GitHub

44.4/100 developing ▬ flat Agent 6/100 agent aware self hosted · Apache-2.0 Full breakdown ↓
scored 2026-09-14 · rubric v0.22.0

AccessFreemium

3 APIs 1 Agent Skills

Compiler JavaScriptLanguage ServiceProgramming LanguageStatic TypingWeb Development

Kin Score

Kin Score How this is scored →
scored 2026-09-14 · rubric v0.22.0

Composite quality — 44.4/100 · developing

Contract Quality 3.3 / 23

Developer Ergonomics 10.1 / 18

Access Clarity 6.6 / 18

Operational Transparency 4.3 / 12

Contract Governance 2.7 / 11

Discoverability 7.3 / 9

Open Source Surface 10.0 / 10

Agent readiness — 6/100 · agent aware

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 5 / 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

Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against 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 90 points between them, because the conditional facet above carries the other 10. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 90% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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 github.com/api-evangelist/typescript: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 3

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

TypeScript Compiler API

Programmatic access to the TypeScript compiler. The Compiler API allows developers to parse TypeScript files into ASTs, perform type checking, emit JavaScript, and transform cod...

TypeScript Language Service API

API for editor integration and language tooling. The Language Service API provides completions, diagnostics, quick fixes, rename, go-to-definition, find references, and other ID...

TypeScript Transform API

The TypeScript Transform API enables custom AST transformations during compilation. Transformers can modify, add, or remove nodes in the TypeScript AST before code emission.

Agent Skills 1

Packaged agent skills for driving this provider's APIs from an AI assistant.

ts-maintain-reduce-repro

AGENT SKILL

Pricing Plans 1

Published pricing tiers and plan structures.

Typescript Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Typescript Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Typescript Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Typescript Context

15 classes · 13 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

TypeScript API Rules

5 rules · 3 warnings 2 info

SPECTRAL

JSON Schema 2

Standalone JSON Schema definitions for this provider's data models.

TypeScript Compiler Options

19 properties

JSON SCHEMA

TypeScript Diagnostic

7 properties

JSON SCHEMA

JSON Structure 1

JSON Structure definitions describing this provider's data shapes.

Typescript Diagnostic Structure

6 properties

JSON STRUCTURE

Security Posture 1

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

Typescript Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

Portal

Portal

GettingStarted

GettingStarted

Documentation 4

Reference material describing how the API behaves

ContributionGuide

Documentation

JSONSchema

JSONSchema

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgentSkills

AgentSkills

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

JSONLD

JSONLD

Vocabulary

Vocabulary

JSONStructure

JSONStructure

Build 4

SDKs, sample code, and the tooling you integrate with

CodeOfConduct

CodeOfConduct

GitHubOrganization

GitHubOrganization

npm

npm

GitHubIssues

GitHubIssues

Access & Security 2

Authentication, authorization, and security posture

SecurityPolicy

SecurityPolicy

DomainSecurity

DomainSecurity

Operate 4

Status, limits, changes, and where to get help

Support

Releases

Community

ReleaseNotes

Commercial 3

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

License

License

Company 4

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Twitter

Twitter

Other 2

Properties that don't map to a standard resource type

Playground

Playground

Handbook

Handbook

Source (apis.yml)

aid: typescript
name: TypeScript
x-parent: microsoft
description: TypeScript is a strongly typed programming language that builds on JavaScript, adding optional static type checking
  and other features. Developed and maintained by Microsoft, TypeScript compiles to plain JavaScript and is widely used for
  large-scale web applications, Node.js services, and developer tooling. The TypeScript Compiler API and Language Service
  API enable programmatic compilation, type checking, code transformation, and IDE integrations.
deliveryModel:
  model: self-hosted
  license: Apache-2.0
  open_source: true
  commercial: false
  callable_host: false
  label: Self-hosted open source · you run it yourself
  confidence: high
  source:
  - license
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://www.typescriptlang.org/favicon-32x32.png
url: https://www.typescriptlang.org
created: '2024-01-01'
modified: '2026-05-19'
specificationVersion: '0.23'
tags:
- Compiler
- JavaScript
- Language Service
- Programming Language
- Static Typing
- Web Development
type: Index
apis:
- aid: typescript:typescript-compiler-api
  name: TypeScript Compiler API
  description: Programmatic access to the TypeScript compiler. The Compiler API allows developers to parse TypeScript files
    into ASTs, perform type checking, emit JavaScript, and transform code programmatically.
  image: https://www.typescriptlang.org/favicon-32x32.png
  humanURL: https://www.typescriptlang.org/docs/handbook/compiler-options.html
  baseURL: https://www.typescriptlang.org
  tags:
  - Compiler
  - Transpilation
  - Type Checking
  - AST
  - Code Generation
  properties:
  - type: Documentation
    url: https://github.com/microsoft/TypeScript/wiki/Using-the-Compiler-API
  - type: GitHubRepository
    url: https://github.com/microsoft/TypeScript
  - type: npm Package
    url: https://www.npmjs.com/package/typescript
  - type: APIReference
    url: https://www.typescriptlang.org/tsconfig
  - type: Compiler Options
    url: https://www.typescriptlang.org/tsconfig/
- aid: typescript:typescript-language-service-api
  name: TypeScript Language Service API
  description: API for editor integration and language tooling. The Language Service API provides completions, diagnostics,
    quick fixes, rename, go-to-definition, find references, and other IDE features that power editors like VS Code.
  image: https://www.typescriptlang.org/favicon-32x32.png
  humanURL: https://www.typescriptlang.org
  baseURL: https://www.typescriptlang.org
  tags:
  - Autocomplete
  - Diagnostics
  - IDE
  - Language Service
  - Refactoring
  properties:
  - type: Documentation
    url: https://github.com/microsoft/TypeScript/wiki/Using-the-Language-Service-API
  - type: GitHubRepository
    url: https://github.com/microsoft/TypeScript
- aid: typescript:typescript-transform-api
  name: TypeScript Transform API
  description: The TypeScript Transform API enables custom AST transformations during compilation. Transformers can modify,
    add, or remove nodes in the TypeScript AST before code emission.
  image: https://www.typescriptlang.org/favicon-32x32.png
  humanURL: https://www.typescriptlang.org/docs/handbook/2/types-from-types.html
  baseURL: https://www.typescriptlang.org
  tags:
  - AST
  - Code Transformation
  - Compilation
  - Custom Transformers
  properties:
  - type: Documentation
    url: https://github.com/microsoft/TypeScript/wiki/Using-the-Compiler-API#traversing-the-ast-with-a-little-linter
  - type: GitHubRepository
    url: https://github.com/microsoft/TypeScript
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
common:
- type: LinkedIn
  url: https://www.linkedin.com/company/typescript
- type: Portal
  url: https://www.typescriptlang.org/
- type: GettingStarted
  url: https://www.typescriptlang.org/docs/handbook/intro.html
- type: TermsOfService
  url: https://www.microsoft.com/en-us/legal/terms-of-use
- type: PrivacyPolicy
  url: https://privacy.microsoft.com/en-us/privacystatement
- type: Support
  url: https://github.com/microsoft/TypeScript/issues
- type: Releases
  url: https://github.com/microsoft/TypeScript/releases
- type: SecurityPolicy
  url: https://github.com/microsoft/TypeScript/blob/main/SECURITY.md
- type: CodeOfConduct
  url: https://github.com/microsoft/TypeScript/blob/main/CODE_OF_CONDUCT.md
- type: ContributionGuide
  url: https://github.com/microsoft/TypeScript/blob/main/CONTRIBUTING.md
- type: License
  name: Apache-2.0
  url: https://github.com/microsoft/TypeScript/blob/main/LICENSE
- type: DomainSecurity
  url: security/typescript-domain-security.yml
- type: Website
  url: https://www.typescriptlang.org
- type: Documentation
  url: https://www.typescriptlang.org/docs/
- type: GitHubOrganization
  url: https://github.com/microsoft/TypeScript
- type: Blog
  url: https://devblogs.microsoft.com/typescript/
- type: Community
  url: https://www.typescriptlang.org/community
- type: npm
  url: https://www.npmjs.com/package/typescript
- type: Playground
  url: https://www.typescriptlang.org/play
- type: Handbook
  url: https://www.typescriptlang.org/docs/handbook/intro.html
- type: ReleaseNotes
  url: https://www.typescriptlang.org/docs/handbook/release-notes/overview.html
- type: GitHubIssues
  url: https://github.com/microsoft/TypeScript/issues
- type: Twitter
  url: https://twitter.com/typescript
- type: JSONLD
  url: json-ld/typescript-context.jsonld
- type: Vocabulary
  url: vocabulary/typescript-vocabulary.yml
- type: JSONSchema
  url: json-schema/typescript-diagnostic-schema.json
- type: JSONSchema
  url: json-schema/typescript-compiler-options-schema.json
- type: JSONStructure
  url: json-structure/typescript-diagnostic-structure.json
- name: Agent Skills
  url: https://github.com/microsoft/TypeScript-Maintainer-Skills
  type: AgentSkills

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