Paste the payload. See the contract. Ship safer code.

From API payloadsto production-ready code.

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

Chrome ExtensionOpen PlaygroundSee how it works ↓
Browser-local JSON processingTypeScript, Zod, PrismaSchema Quality CheckNo forced signupVerify it →
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.

Tools

Every tool for API payloads

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

Understand
LAB
Prompt Lab
Craft AI prompts — 100% local
EXP
JSON Explainer
Plain-English breakdown
QC
Schema Quality Check
0–100 score + warnings
DR
Contract Doctor
Actionable risk advice
Generate
TS
TypeScript
Typed interfaces
ZOD
Zod Schema
Runtime validation
P
Prisma
Database models
GQL
GraphQL
Type definitions
JS
JSON Schema
Draft 2020-12
SQL
SQL
INSERT statements
YML
YAML
Config format
CSV
CSV
Spreadsheet data
~
Mock Data
Realistic fakes
Build
API
API → Typed Client ✦
Types + Zod + fetch + mock
Compare
≠
JSON Diff
Breaking-change detector
Utilities
{}
Formatter
Beautify & validate
⊞
Tree View
Visual explorer
JWT
JWT Decoder
Token inspector
64
Base64
Encode / Decode
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 API handoff notes, usage examples, and implementation guidance — with OpenAPI export on the roadmap.
🔀
Compare versions
Diff old and new API responses to surface breaking changes and migration work.
Capture payloads from any page with the Chrome Extension →
Pricing

Simple pricing

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

Free
€0
no signup · 50 actions/day
  • ✓ All browser-local tools · 50 actions/day
  • ✓ Chrome Extension & bookmarklet
  • ✓ JSON Explainer & Schema Score
  • ✓ TypeScript, Zod, Prisma, SQL & more
  • ✓ 2 workspaces · 3 tabs each
  • ✓ Your JSON stays in your browser
Open Playground →
Best value
Pro — Lifetime
€49
one-time · incl. VAT · 3 devices
  • ✦ Everything in Free — no daily cap
  • ✦ Schema Quality Check (full) & Contract Doctor
  • ✦ API Response → Typed Client
  • ✦ Unlimited workspaces · 50 tabs each
  • ✦ 3 devices · encrypted cross-device sync
  • ✦ 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
Need a quick formatter, decoder, or generator? Open PayloadIQ Utilities.Browse Utilities →