API payload intelligence · Free tier · No signup

From API payloadsto production-ready code.

PayloadIQ helps developers understand, validate, generate, document, and migrate API payloads — with browser-local JSON processing.

Open PlaygroundSee how it works ↓
Browser-local JSON processingTypeScript, Zod, PrismaSchema Quality CheckNo forced signup
100%
in-browser JSON
18
dev tools
0
signup
€49
pro lifetime
payloadiq.dev/app
📄 input.json
{
  "user": {
    "id": "usr_abc123",
    "name": "Alice Johnson",
    "email": "alice@acme.com",
    "age": 28,
    "isPremium": true,
    "createdAt": "2024-01-15T10:30:00Z",
    "tags": ["dev", "typescript"]
  }
}
⚡ output.tsSchema Score 93/100
export interface User {
  id: string;
  name: string;
  email: string;
  age: number;
  isPremium: boolean;
  createdAt: string;
  tags: string[];
}

export interface Root {
  user: User;
}
⚠ createdAt → validate as datetime◆ email → add .email()

Raw payload → schema score→ safer generated code. PayloadIQ doesn't just convert — it understands and validates.

Tools

Every tool for API payloads

Understand, generate, build, and compare — organized by what you’re doing.

Understand
Generate
Build
Compare
Utilities
Why PayloadIQ

Not just conversion. Payload intelligence.

PayloadIQ explains the shape, catches risky fields, and generates the code you actually need to ship.

🔍
Understand payloads
Explain JSON structure, required and nullable fields, and detected IDs, dates, emails, URLs, and possible enums.
⚙️
Generate production code
TypeScript, Zod, Prisma, GraphQL, JSON Schema, SQL, YAML, CSV, and mock data — instantly.
🧩
Build typed clients
Turn an API response into types, a Zod validator, a typed fetch client, a mock response, and usage examples.
🛡️
Detect contract risks
Catch mixed array shapes, unsafe field names, nullable IDs, large-integer risks, and Prisma/SQL pitfalls before you ship.
📘
Document APIs
Generate clean API documentation, with OpenAPI export on the roadmap.
🔀
Compare versions
Diff old and new API responses to surface breaking changes and migration work.
Pricing

Simple pricing

Start free, no signup. Upgrade to Pro for the workflow tools.

Free
€0
no signup · daily limit applies
  • ✓ Browser-local basic tools
  • ✓ JSON Explainer & Schema Score
  • ✓ TypeScript & Zod basics
  • ✓ JWT decode & Base64
  • ✓ Your JSON stays in your browser
Open Playground →
Best value
Pro — Lifetime
€49
one-time · incl. VAT · 3 devices
  • ✦ Schema Quality Check (full mode)
  • ✦ Contract Doctor
  • ✦ API Response → Typed Client
  • ✦ Batch / custom / export (as available)
  • ✦ All future Pro tools
  • ✦ Priority support
Get lifetime access →
Privacy

Private by design, honest about servers.

PayloadIQ processes your JSON in the browser. Your pasted payloads are not uploaded to our server. Server calls are used only for sessions, usage limits, payments, license checks, and Pro access.

✓Pasted JSON is not sent to /api/session
✓Pasted JSON is not sent to /api/usage
✓Pasted JSON is not stored in Supabase
✓Payment & license checks never require your payload
✓No analytics or trackers on your payloads
✓Share links put data in the URL hash — avoid sharing sensitive payloads
FAQ

Common questions

Stop writing types by hand.

Open the playground, paste a response, and get types, validators, a typed client, and a schema score in seconds.

Open Playground