niche · 0.2 capability schema

JSON-Schema

Score 19.3 / 100 32 providers 22 APIs Search apis.io →
Variants seen in the corpus: JSON SchemaJSON-Schemajson-schema

Providers using this tag (32)

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Exemplar 1 Complete, well-documented, and agent-ready
API EvangelistAPI EvangelistDeveloper PortalAPI ResearchAPI Governance17 APIs69.8
Strong 3 Solid coverage with minor gaps
ArcadeAgentsMCPAI AgentsAuthorization11 APIs60.8Microsoft AzureAPI ManagementCloudCloud ComputingEnterprise1667 APIs57.3mParticleCustomer Data PlatformCDPAnalyticsIdentity Resolution6 APIs57.2
Developing 5 Usable, with meaningful gaps to close
OpenTravel AllianceTravelUnited StatesStandardsAviation4 APIs47.1FDC3Financial-ServicesFintechDesktop InteroperabilityOpen Standard6 APIs46.4BTC War Live Market Data APIFinanceCryptocurrencyMarket DataBitcoin1 API45.8.txtCompanyArtificial IntelligenceLLMStructured Outputs6 APIs42.4ScalarAPI ClientAPI DocumentationAPI ReferencesCode Generation30 APIs40.3
Thin 6 Limited public surface area
KiotaCode GenerationMicrosoftOpenAPISDK1 API38.5Confluent | the Data Streaming PlatformApache FlinkApache KafkaConfluent CloudConnectors11 APIs38.2Confluent Schema RegistryApache KafkaAvroCompatibilityConfluent5 APIs36.0RedpandaStreamingKafkaEvent StreamingReal-Time10 APIs33.8OgenCode GenerationGoOpenAPISDK1 API33.1dottxtCompanyArtificial IntelligenceLLMStructured Outputs2 APIs30.0
Emerging 15 Early or largely undocumented
CucumberAutomationBDDBehavior-Driven DevelopmentGherkin5 APIs25.5EncoreBackendCloud-NativeFrameworksGo2 APIs24.2FastifyFrameworksHigh PerformanceJavaScript1 API23.9NSwag.NETASP.NET CoreC#Code Generation1 API23.5TypeSpecAPI DesignCode GenerationOpenAPIProtocol Buffers6 APIs23.3API Style GuidesAPI Style GuidesAPI DesignAPI GovernanceREST11 APIs20.0Citation File FormatAcademicCitationMetadataOpen Standard6 APIs19.4SpectralAPI DesignAPI LintingAPI Style GuideAsyncAPI1 API19.2SpecLynxAPI DesignAsyncAPIDeveloper Tools6 APIs18.8AramisAutoCompanyConsumerAutomotiveE-Commerce1 API17.5API SpecificationsAPI SpecificationSpecification LanguagesAPI DesignContracts13 APIs15.4API LintingAPI DesignAPI GovernanceAPI LintingAPI Style Guide10 APIs14.4OpenJS FoundationJavaScriptLinux FoundationNode.jsWeb6 APIs13.7JargonAPI DesignData ModellingDomain-Driven DesignDomains1 API12.8SchemaSureStructured Data Extractiontext-to-JSONDocument Parsing1 API12.6
Minimal 2 Almost no public developer surface
Open mHealthHealthHealthcareMobile HealthmHealth6.0Interface ResearchAPI ResearchInterface SpecificationsVocabulary4.1

APIs with this tag (22)

Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →

Exemplar 1 Complete, well-documented, and agent-ready
API Evangelist SchemaThe naming and structure of the digital objects we pass back and forth via APIs within the business and per...69.8
Strong 3 Solid coverage with minor gaps
Arcade Public SchemasThe ArcadeAI/schemas repo on GitHub publishes versioned JSON Schemas for the Arcade engine configuration (1...60.8Microsoft Azure Resource JSON SchemaJSON Schema definitions for core Azure Resource Manager data models including the base Resource type, Resou...57.3mParticle Data Planning APIREST API for managing data plans and data plan versions in a workspace, and for validating an event batch a...57.2
Developing 2 Usable, with meaningful gaps to close
FDC3 Context DataFDC3 Context Data defines a standard set of typed data structures used to carry information between financi...46.4Scalar RegistryScalar Registry provides centralized management and versioning of OpenAPI Documents, JSON Schemas, and Spec...40.3
Thin 2 Limited public surface area
Confluent Schema Registry REST APIThe Schema Registry REST API stores and serves Avro, JSON Schema, and Protobuf schemas with versioning and ...38.2Redpanda Schema Registry APIThe Redpanda Schema Registry API is a Confluent-Schema-Registry-compatible REST API for managing Avro, JSON...33.8
Emerging 14 Early or largely undocumented
Cucumber MessagesProtocol-buffer / JSON Schema specification of the messages exchanged between Cucumber components (parsers,...25.5Encore Application ConfigurationThe encore.app configuration file is the canonical declaration of an Encore application, including its plat...24.2FastifyFastify is a fast and low-overhead web framework for Node.js, designed for building high-performance APIs a...23.9TypeSpec JSON Schema EmitterEmits JSON Schema documents from TypeSpec model definitions, enabling data validation and type documentatio...23.3Heroku Platform API Design ConventionsHeroku's design conventions for the Platform API, documented in the Platform API Reference and the API Comp...20.0Citation File Format SchemaThe CFF schema defines the structure of a CITATION.cff file in YAML, including required cff-version, messag...19.4SpectralSpectral is a flexible JSON/YAML linter and style guide enforcer with built-in support for OpenAPI (v3.1, v...19.2SpecLynx CLIA command-line interface for overlay operations, dereferencing, bundling, format conversion (JSON/YAML), an...18.8Aramisauto Vehicle Catalog ContractsAramis Group publishes the machine-readable contracts behind the Aramisauto vehicle catalog as ten JSON Sch...17.5JSON SchemaJSON Schema is a declarative language for annotating and validating JSON documents. It is the foundational ...15.4Apicurio RegistryRed Hat's open-source API/schema registry that stores and validates OpenAPI, AsyncAPI, JSON Schema, Avro, P...14.4APIMetricsAPIMetrics provides live-traffic API monitoring with a rule engine that evaluates JSON Schema and response-...14.4FastifyFastify is a fast, low-overhead web framework for Node.js with a strong plugin architecture and built-in JS...13.7SchemaSure Structured Extraction APIREST API (OpenAPI 3.1) exposing POST /v2/extract (x402 V2 paid), legacy POST /extract, GET /health, and GET...12.6

Score breakdown

Frequency
42.9
log-scaled weighted occurrences
Breadth
0.9
spread across providers
Quality lift
36.1
mean composite of providers using it
Cohesion
7.6
strength of nearest seed neighbor

Related tags

Spectral 5 co-occurrences API Design 8 co-occurrences Protobuf 5 co-occurrences Code Generation 6 co-occurrences AsyncAPI 5 co-occurrences OpenAPI 13 co-occurrences Validation 5 co-occurrences TypeScript 6 co-occurrences

Where this tag comes from

Api tag22
Provider tag17

Cohort brief

Auto-generated

The 32 providers in the APIs.io catalog tagged JSON-Schema, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers
32
all scored
Mean Kin Score
30.3
+9.6 vs catalog 20.7
Mean Agent Readiness
16.3
+6.6 vs catalog 9.7
Spread
4.1–69.8
median 24.9 · σ 16.4
How the 32 split by band
Exemplar 1Strong 3Developing 5Thin 6Emerging 15Minimal 2
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Operational Transparency 24.3 11.3 +13 32
Contract Governance 18.7 6.4 +12.3 32
Contract Quality 29.1 17.5 +11.6 32
Developer Ergonomics 29.2 17.9 +11.3 32
Discoverability 68.6 60.4 +8.2 32
Access Clarity 25 22.3 +2.7 32

A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.

What this cohort publishes
ArtifactThis cohortCatalogDifference
MCP server (any) 31% 16% +15
MCP server (first-party) 16% 7% +9
Agent Skills 0% 0% 0
OAuth scopes 6% 9% -3
Security 94% 88% +6
Arazzo workflows 3% 2% +1
Governance rules 53% 13% +40

mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.

Top by Kin Score
  1. 1 API Evangelist 69.8
  2. 2 Arcade 60.8
  3. 3 Microsoft Azure 57.3
  4. 4 mParticle 57.2
  5. 5 OpenTravel Alliance 47.1
  6. 6 FDC3 46.4
  7. 7 BTC War Live Market Data API 45.8
  8. 8 .txt 42.4
  9. 9 Scalar 40.3
  10. 10 Kiota 38.5
Top by Agent Readiness
  1. 1 BTC War Live Market Data API 55
  2. 2 mParticle 50.5
  3. 3 Microsoft Azure 49.6
  4. 4 API Evangelist 44.8
  5. 5 OpenTravel Alliance 43.9
  6. 6 .txt 34.5
  7. 7 Scalar 28.5
  8. 8 FDC3 28.1
  9. 9 Confluent Schema Registry 26.6
  10. 10 Arcade 25.5
All 32 members of this roster resolve to a scored provider in the catalog.Generated from the catalog build of 25 August 2026, across 26891 providers, using the same computation served by the APIs.io cohort API. Briefs are published for rosters of 5 or more scored providers; below that a distribution is not meaningful.

Work with this as data

Every tag here is available over the APIs.io API and to AI agents over MCP.

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Tools for tags

7 MCP tools reach this
  • find_tagsBrowse and filter every tag in the catalog.
  • get_cohortThis tag as a scored cohort — every provider carrying it, with scores.
  • cohort_statsPRO — the distribution across this tag: mean, median, band split, adoption rates.
  • cohort_rankingsPRO — the leaderboard, on composite AND agent-readiness axes.
  • 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.
All 92 tools

Call it yourself

curl for this page
This tag 
curl "https://apis.io/api/v1/tags/json-schema"
All tags 
curl "https://apis.io/api/v1/tags?limit=25"
As a scored cohort 
curl "https://apis.io/api/v1/cohorts/tag/json-schema"
The distribution (Pro) 
curl "https://apis.io/api/v1/cohorts/tag/json-schema/stats" \
  -H "X-API-Key: $APIS_IO_KEY"

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