JSON

JSON (JavaScript Object Notation) is a lightweight, text-based, language-independent data interchange format that uses human-readable text to represent structured data as key-value pairs and arrays. JSON is standardized by RFC 8259 (December 2017), which obsoletes RFC 7159 (2014) and RFC 4627 (2006). It has become the de facto standard for data exchange in web APIs, configuration files, and NoSQL databases due to its simplicity and broad language support.

JSON publishes 1 API on the APIs.io network. Tagged areas include Data Format, Serialization, Web Development, JSON, and RFC 8259.

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

JSON’s developer surface includes documentation and 3 more developer resources.

🌐 Visit website 📡 Source on GitHub

16.3/100 emerging ▬ flat Agent 3/100 human only Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreemium

1 APIs

Data Format Serialization Web Development JSONRFC 8259

Kin Score

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

Composite quality — 16.3/100 · emerging

Contract Quality 2.7 / 25

Developer Ergonomics 2.4 / 20

Access Clarity 3.2 / 20

Operational Transparency 1.0 / 13

Contract Governance 1.2 / 12

Discoverability 5.9 / 10

Agent readiness — 3/100 · 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

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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APIs 1

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

JSON

JSON (JavaScript Object Notation) specification and related resources. Standardized by IETF as RFC 8259 (December 2017, edited by Tim Bray) and by Ecma International as ECMA-404...

Pricing Plans 1

Published pricing tiers and plan structures.

Json Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Json Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Json Finops

FINOPS

Semantic Vocabularies 1

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

Json Context

0 classes · 21 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

JSON API Rules

6 rules · 3 warnings 3 info

SPECTRAL

JSON Schema 2

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

JSON Patch and JSON Merge Patch

0 properties

JSON SCHEMA

JSON Schema Draft 2020-12 Meta-Schema

0 properties

JSON SCHEMA

Security Posture 1

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

Json Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

Reference

Reference

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: json
name: JSON
description: JSON (JavaScript Object Notation) is a lightweight, text-based, language-independent data interchange format
  that uses human-readable text to represent structured data as key-value pairs and arrays. JSON is standardized by RFC 8259
  (December 2017), which obsoletes RFC 7159 (2014) and RFC 4627 (2006). It has become the de facto standard for data exchange
  in web APIs, configuration files, and NoSQL databases due to its simplicity and broad language support.
type: Index
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  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://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/json.png
tags:
- Data Format
- Serialization
- Web Development
- JSON
- RFC 8259
url: https://raw.githubusercontent.com/api-evangelist/json/refs/heads/main/apis.yml
created: '2025-01-01'
modified: '2026-04-28'
specificationVersion: '0.23'
apis:
- aid: json:json
  name: JSON
  description: JSON (JavaScript Object Notation) specification and related resources. Standardized by IETF as RFC 8259 (December
    2017, edited by Tim Bray) and by Ecma International as ECMA-404. Defines the grammar and syntax for objects, arrays, strings,
    numbers, booleans, and null values.
  humanURL: https://www.json.org/
  tags:
  - Data Format
  - Serialization
  - RFC 8259
  properties:
  - type: Documentation
    url: https://www.json.org/
  - type: Reference
    url: https://www.rfc-editor.org/rfc/rfc8259
  - type: Specification
    url: https://ecma-international.org/publications-and-standards/standards/ecma-404/
common:
- type: DomainSecurity
  url: security/json-domain-security.yml
- type: Website
  url: https://www.json.org/
- type: Documentation
  url: https://www.json.org/
- type: Reference
  url: https://www.rfc-editor.org/rfc/rfc8259
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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