StackBlitz

StackBlitz is an online development environment that runs Node.js applications entirely in the browser using WebContainers, a WebAssembly-based operating system that boots Node.js in milliseconds without a remote server. It serves developers, technical writers, and platform teams who need interactive coding environments, documentation playgrounds, or embedded IDE experiences. The platform provides a JavaScript SDK for programmatically creating and embedding projects, and a WebContainer API for booting full Node.js runtimes directly inside web applications. StackBlitz also offers Codeflow, a one-click GitHub integration for pull request review and issue fixing workflows.

StackBlitz is listed with 2 APIs on the APIs.io network. Tagged areas include Developer Tools, WebAssembly, Node.js, IDE, and Browser Runtime.

The StackBlitz catalog on APIs.io includes 1 JSON-LD context.

StackBlitz’s developer surface includes documentation, engineering blog, pricing, and 10 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

17.7/100 emerging ▬ flat Agent 1/100 human only Front door AI 2/6 trace Heartbeat 34/100 slowing saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemium

2 APIs

Developer Tools WebAssembly Node.js IDEBrowser RuntimeCode Environments

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 17.7/100 · emerging

Contract Quality 2.3 / 21

Developer Ergonomics 4.0 / 17

Access Clarity 2.5 / 17

Operational Transparency 2.6 / 11

Contract Governance 0.0 / 10

Discoverability 4.9 / 9

Regulatory Posture 0.7 / 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 Ask about this →
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author Ask about this →
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) Ask about this →
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) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →

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 10.7 — up to +22.3 composite points Ask about this →
Access Clarity scores 14.9 — up to +17.0 composite points Ask about this →
Developer Ergonomics scores 23.8 — up to +15.2 composite points Ask about this →

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.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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/stackblitz/apis.yml: open an issue on github.com/api-evangelist/stackblitz 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
IDE Extension Marketplaces (JetBrains, VS Code, Open VSX, Docker Verified Publishers, PyPI orgs)	distribution	9.6 (thin)	-	1

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

APIs 2

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

StackBlitz JavaScript SDK

A lightweight (3kB gzipped) JavaScript SDK that lets developers programmatically create, open, and embed StackBlitz projects in web pages, documentation sites, or blog posts. Pr...

WebContainer API

A browser-based runtime API that executes Node.js applications and operating system commands directly inside a browser tab using WebAssembly. Provides classes and methods for bo...

StackBlitz API pricing

Not yet checked against StackBlitz's own pricing page. Compiled by API Evangelist on 2026-06-12 from stackblitz.com/pricing; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Personal free	Free
Pro paid	$25 per monthly Subscription / month · $18 per annual Subscription (per month) / month
Teams paid	$60 per monthly Subscription / month · $55 per annual Subscription (per month) / month
Enterprise enterprise	Free

Plan details, limits and sources →

Rate limits

WebContainer API Sessions (Commercial Plan): 500 sessions per month
WebContainer API Sessions (Open Source / Non-Commercial): unlimited sessions per month

Compiled by API Evangelist, not yet checked against StackBlitz's documentation. Rate-limit details →

Pricing Plans 1

Published pricing tiers and plan structures.

StackBlitz Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

StackBlitz Rate Limits

2 limits

RATE LIMITS

FinOps 1

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

StackBlitz Finops

FINOPS

Semantic Vocabularies 1

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

Stackblitz Context

0 classes · 32 properties

JSON-LD

Security Posture 1

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

StackBlitz Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

WebContainersDocumentation

WebContainersDocumentation

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

StatusPage

StatusPage

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

Website

Website

LinkedIn

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Source (apis.yml)

aid: stackblitz
name: StackBlitz
description: StackBlitz is an online development environment that runs Node.js applications entirely in the browser using
  WebContainers, a WebAssembly-based operating system that boots Node.js in milliseconds without a remote server. It serves
  developers, technical writers, and platform teams who need interactive coding environments, documentation playgrounds, or
  embedded IDE experiences. The platform provides a JavaScript SDK for programmatically creating and embedding projects, and
  a WebContainer API for booting full Node.js runtimes directly inside web applications. StackBlitz also offers Codeflow,
  a one-click GitHub integration for pull request review and issue fixing workflows.
type: Index
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/stackblitz.png
x-docs-platform: vitepress
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-17
x-docs-hosting: netlify
tags:
- Developer Tools
- WebAssembly
- Node.js
- IDE
- Browser Runtime
- Code Environments
url: https://raw.githubusercontent.com/api-evangelist/stackblitz/refs/heads/main/apis.yml
created: '2026-06-12'
modified: '2026-06-12'
specificationVersion: '0.23'
apis:
- aid: stackblitz:javascript-sdk
  name: StackBlitz JavaScript SDK
  description: A lightweight (3kB gzipped) JavaScript SDK that lets developers programmatically create, open, and embed StackBlitz
    projects in web pages, documentation sites, or blog posts. Provides six primary methods including openProject, embedProject,
    openGithubProject, embedGithubProject, openProjectId, and embedProjectId, along with a VM interface for controlling embedded
    environments post-mount.
  humanURL: https://developer.stackblitz.com/platform/api/javascript-sdk
  tags:
  - JavaScript
  - SDK
  - Embed
  - IDE
  properties:
  - type: Documentation
    url: https://developer.stackblitz.com/platform/api/javascript-sdk
  - type: SDKOptions
    url: https://developer.stackblitz.com/platform/api/javascript-sdk-options
  - type: VMInterface
    url: https://developer.stackblitz.com/platform/api/javascript-sdk-vm
- aid: stackblitz:webcontainer-api
  name: WebContainer API
  description: A browser-based runtime API that executes Node.js applications and operating system commands directly inside
    a browser tab using WebAssembly. Provides classes and methods for booting a container instance, mounting file systems,
    spawning processes, managing files, and handling OAuth authentication. Supports npm, pnpm, and yarn natively and emits
    events for port bindings and server-ready states. Commercial use in production for-profit applications requires a license.
  humanURL: https://webcontainers.io/api
  baseURL: https://webcontainers.io
  tags:
  - WebContainers
  - Node.js
  - Browser Runtime
  - WebAssembly
  properties:
  - type: Documentation
    url: https://webcontainers.io/api
  - type: GettingStarted
    url: https://webcontainers.io/guides/quickstart
common:
- type: DomainSecurity
  url: security/stackblitz-domain-security.yml
- type: Website
  url: https://stackblitz.com
- type: Documentation
  url: https://developer.stackblitz.com
- type: WebContainersDocumentation
  url: https://webcontainers.io
- type: GitHubOrganization
  url: https://github.com/stackblitz
- type: LinkedIn
  url: https://www.linkedin.com/company/stackblitz
- type: Blog
  url: https://blog.stackblitz.com
- type: Pricing
  url: https://stackblitz.com/pricing
- type: StatusPage
  url: https://status.stackblitz.com
- type: X
  url: https://x.com/stackblitz
- type: Plans
  url: plans/stackblitz-plans-pricing.yml
- type: RateLimits
  url: rate-limits/stackblitz-rate-limits.yml
- type: FinOps
  url: finops/stackblitz-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

StackBlitz API — frequently asked questions

Does StackBlitz have an API?

Yes. APIs.io lists 2 APIs from StackBlitz, including StackBlitz JavaScript SDK and WebContainer API.

How much does the StackBlitz API cost?

APIs.io lists 4 pricing plans for StackBlitz, with each plan's price, limits and inclusions under Pricing on this page.

Is the StackBlitz API ready for AI agents?

StackBlitz has a Kin Score of 17.7 out of 100 (emerging) and an Agent Readiness score of 0.6 (human-only), scored by API Evangelist on 2026-11-13.

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