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A curated list of free public APIs across 48 categories — searchable, community-maintained, with a free JSON API.

Transforms complex documents like PDFs and Office docs into LLM-ready markdown/JSON for your Agentic workflows.

Convert PDF to markdown + JSON quickly with high accuracy

免费Python量化SDK:通达信协议直连 A股/港股/美股数据,内置技术指标、缠论分析、回测引擎与 Web 可视化,JSON 输出适配 AI Agent

AI-friendly PPT builder skill: 17 hand-polished Chinese PPTX templates + non-destructive text-only editing tools (python-pptx based). Pick a template, write edits.json, build a real .pptx with the layout intact. Personal/research use only.

JSON for Modern C++

Codex登陆助手：安全地在本地导出您的已登录 ChatGPT 会话配置，生成符合 Codex 规范的 auth.json 本地备份文件。

An unofficial JSON API for Counter-Strike 2 in multiples languages. List of skins, cases, stickers, collections, collectibles, agents, graffiti, keys, patches and music kits.

Popular Kubernetes CRDs (CustomResourceDefinition) in JSON schema format.

Extremely fast, in memory, serialization, reflection, and RPC library for C++. JSON, BEVE, BSON, CBOR, CSV, JSONB, MessagePack, TOML, YAML, EETF

An implementation of the JSON Schema specification for Python

signal-cli provides an unofficial commandline, JSON-RPC and dbus interface for the Signal messenger.

Fast, scriptable CLI for the App Store Connect API. Automate TestFlight, builds, submissions, signing, analytics, screenshots, subscriptions, and more. JSON-first, no interactive prompts

Generate Pydantic v2 models, dataclasses, TypedDict, and msgspec.Struct from OpenAPI, JSON Schema, GraphQL, Avro, Protobuf, and raw JSON/YAML/CSV.

🌲 super fast, all natural json logger

🎒 Token-Oriented Object Notation (TOON) – Compact, human-readable, schema-aware JSON for LLM prompts. Spec, benchmarks, TypeScript SDK.

Optimized JSON for Go

Free open public domain football data for the world cups (national teams & clubs) in JSON incl. Canada/USA/Mexico 2026, USA 2025, Qatar 2022, Russia 2018 and more - No API key required ;-)

yq is a portable command-line YAML, JSON, XML, CSV, TOML, HCL and properties processor

Native desktop automation CLI for AI agents. Control any application through OS accessibility trees with structured JSON output and deterministic element refs.

✨ Innovative and open-source visualization application that transforms various data formats, such as JSON, YAML, XML and CSV into interactive graphs.

Zero Allocation JSON Logger

Parsing gigabytes of JSON per second : used by Facebook/Meta Velox, the Node.js runtime, ClickHouse, WatermelonDB, Apache Doris, Milvus, StarRocks

Generate types and converters from JSON, Schema, and GraphQL

CVE cache of the official CVE List in CVE JSON 5 format

ArcadeDB Multi-Model Database, one DBMS that supports SQL, Cypher, Gremlin, HTTP/JSON, MongoDB and Redis. ArcadeDB is a conceptual fork of OrientDB, the first Multi-Model DBMS. ArcadeDB supports Vector Embeddings.

A Java serialization/deserialization library to convert Java Objects into JSON and back

The Open Source kanban, built with Meteor. GitHub issues/PRs are only for FLOSS Developers, not for support, support is at https://wekan.fi/commercial-support/ . New English strings for new features at imports/i18n/data/en.i18n.json . Non-English translations at https://app.transifex.com/wekan/wekan only.

A web-based tool to view, edit, format, and validate JSON

Curated collection of reusable JSON prompt templates & style references for AI image generation. Updated daily.