What templates are included?

Six common shapes: User (firstName, email, age, registeredAt), Order (items, total, status), Product (sku, price, tags), Address (street, city, zip), Company (industry, employees, founded), Blog Post (title, slug, authorId, tags).

Can I get reproducible output?

Yes — set the Seed field to any whole number. The generator uses a seedable PRNG (mulberry32), so the same seed always produces the same data. Useful for stable test fixtures.

How many items can I generate?

Up to 1000 items per click. The output stays in your browser; performance scales linearly with count.

Can I add custom templates?

Custom templates aren't supported in this build. The current six cover the most common test-data shapes; if you need something specific, generate close-enough data and tweak the JSON before use.

Is the generated data realistic?

Realistic-ish — names, cities, and product words come from curated lists; emails follow firstname.lastname@example.com; dates fall within plausible ranges. It's good enough for fixtures, mockups, and demos. Not suitable for legal compliance testing or anything requiring statistically representative data.

Are the email addresses real?

No — every generated email uses the example.com domain (reserved by RFC 2606 for documentation/example use). Safe to ship in tutorials, screenshots, and tests without bouncing real mailboxes.

Is my generated data sent to a server?

No. Generation happens entirely in your browser — nothing is uploaded.

Can I use the output as a Postman / Insomnia mock body?

Yes. Generate the shape you need, copy with one click, and paste into the request body. The data is realistic enough to pass schema validation while staying obviously synthetic for code review.

JSON Generator — Dummy & Fake JSON Data

Free online JSON generator — create dummy and fake JSON for testing, mockups, and demos. Pick a template, choose count, get sample data instantly.

Generate dummy JSON data for tests, mockups, and demos. Pick a template (User, Order, Product, Address, Company, Blog Post), choose how many items you want, click Generate. Optional seed for reproducible output — the same seed always produces the same data.

Want types for the generated shape? JSON to TypeScript turns sample JSON into TS interfaces. Want a CSV instead? JSON to CSV flattens an array of objects.

Template

Count

Seed (optional)

Preview: id, firstName, email, age, active. Set a seed to make the output reproducible (re-running with the same seed gives identical data).

Output

Output:empty

How to Generate Dummy JSON

Pick a template
Choose User, Order, Product, Address, Company, or Blog Post. Each has a realistic shape with sensible field types.
Choose a count
Set Count = 1 for a single object, or 2+ for an array of items. Up to 1000 items per generation.
Optional: set a seed
Type a number into Seed to get reproducible output — same seed always produces identical data. Leave empty for fresh randomness on every click.

When Do You Need a JSON Generator?

UI mockups: Build a list view, grid, or table without waiting for the backend. Generate 50 fake users / products / orders and wire them into your component for instant visual feedback.

Test fixtures: Set a seed and generate stable data for unit / integration tests. The same seed always produces identical data, so snapshots stay clean.

API mocking: Drop the generated array into MSW, json-server, or Postman mock servers to simulate a real backend before it exists.

Database seeding: Generate a few hundred rows, paste into a script, bulk insert into your dev database. Faster than typing fixtures by hand.

Why Use PDFFlare for JSON Generation?

Seedable Reproducibility

Set a seed for stable output. Re-running with the same seed gives identical data — perfect for fixtures.

Realistic Shapes

Each template uses sensible field types and realistic value ranges — not just `"name": "name"` placeholders.

100% Browser-Based

No server roundtrip. No rate limits. Up to 1000 items generated locally in milliseconds.

No Signup Required

Open, pick, generate, copy. Zero friction.

Frequently Asked Questions About JSON Generator

JSON Formatter

Format, validate, repair JSON

JSON to TypeScript

Generate TS interfaces from JSON

JSON to CSV

Convert JSON ↔ CSV both ways

JSON to YAML

Convert JSON ↔ YAML both ways

JSON Diff

Compare two JSONs structurally

JSON Schema

Generate + validate JSON Schema