Mocking.Dev

Mock data, JSON, API testing

Mock Data
for
Fast Prototyping

Browse ready-made mock data presets, customize schemas, and use lightweight tools for JSON, CSV, API, and frontend testing workflows.

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API response preview

Product Page preset

JSON

{
  "product": {
    "id": "prod_1048",
    "name": "Modular Desk Lamp",
    "price": 84,
    "rating": 4.8,
    "inventory": 128,
    "variants": ["black", "white", "graphite"]
  }
}

Preview realistic mock data presets

Simple User List

{
  "id": "6b042125-686a-43e0-8a68-23cf5bee102e",
  "name": "Vanessa Pouros",
  "username": "Marques98",
  "email": "Patience_King29@gmail.com",
  "avatarUrl": "https://picsum.photos/seed/dgu3z9AH6/520/78",
  "jobTitle": "Regional Quality Administrator",
  "isActive": true,
  "createdAt": "2025-02-18T05:53:07.955Z"
}

Tools for working with test data

JSON Formatter

Paste JSON and format it with consistent indentation after a short debounce delay.

JSON Validator

Paste JSON to verify that generated mock data is valid before using it in tests, demos, or API fixtures.

JSON to TypeScript

Convert sample JSON into TypeScript interfaces so frontend developers can type API responses and mock data quickly.

CSV to JSON

Convert CSV rows into JSON arrays for mock data imports, quick API fixtures, and prototype datasets.

JSON to CSV

Convert JSON arrays into CSV output for download-style mock data workflows and spreadsheet inspection.

UUID Generator

Generate UUIDs for mock users, orders, products, records, and other fixture identifiers.

Unix Timestamp Converter

Convert Unix timestamps into ISO dates, local dates, seconds, and milliseconds for API, log, and test data workflows.

Base64 Encoder Decoder

Encode and decode Base64 strings for tokens, payloads, headers, and API test values.

URL Encoder Decoder

Encode and decode URL components for query strings, redirects, API debugging, and copied request values.

JWT Decoder

Decode JWT header and payload JSON while debugging auth flows, API tests, and mock tokens.

Regex Tester

Test regular expressions against sample validation text and fixture data.

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