Random Data Generator

Generate random numbers, strings, UUIDs, colors, dates, and booleans for testing and development.

Data Type

Quantity

Results

What Is a Random Data Generator?

A random data generator produces arbitrary values within configurable constraints. It is essential for software testing, database seeding, form filling, load testing, and generating sample data for demonstrations without ever exposing real user information.

This tool supports seven data types: integers, decimals, strings (with four character sets), UUID v4 identifiers, colors (hex, RGB, or HSL), dates (with four output formats), and booleans. You can create up to 1,000 values in a single run, and every value is written on its own line in the results area.

Randomness comes from Math.random(), the pseudorandom number generator built into every browser. It is fast and perfectly adequate for mock data, but it is not cryptographically secure, so it should never be used for passwords, API keys, or security tokens. For those cases you need crypto.getRandomValues() or a dedicated library.

Each data type exposes its own constraints. Integers take a minimum and a maximum; decimals add a number of decimal places; strings take a length and a character set; dates take a start date, an end date, and an output format. UUID and boolean types need no options because they follow fixed formats defined by their specifications.

Everything runs locally in your browser. No value is ever transmitted to a server, so the tool works offline once the page has loaded and your test data stays private. If a range is invalid — for example a minimum larger than the maximum — the tool simply emits an empty line instead of throwing an error, so check your constraints whenever you see blank output.

Key Concepts

Pseudorandom output

Values are drawn from Math.random(), which is fast but not secure.

Seven data types

Integer, decimal, string, UUID v4, color, date, and boolean.

Configurable constraints

Min/max, length, character set, decimal places, and date range.

Bulk generation

Produce between 1 and 1,000 values per run, one per line.

Clipboard ready

Copy the entire result set with a single click.

Fully client-side

Nothing leaves your device, so results work offline and stay private.

How to Use

Select data type — Choose from Integer, Decimal, String, UUID v4, Color, Date, or Boolean.
Configure options — Set constraints like min/max values, string length, character set, date range, or color format.
Set quantity — Choose how many values to generate (1–1,000).
Generate — Click the Generate button. Results appear in the text area below.
Copy or clear — Use the Copy button to copy all results to your clipboard, or Clear to reset.

Options Reference

Each data type unlocks a different set of controls. The table below lists every option, the values it accepts, and a representative example of the output it produces.

Data Type	Options	Example Output	Notes
Integer	Minimum, Maximum	42	Whole number in the inclusive range; a blank line means the range is invalid.
Decimal	Minimum, Maximum, Decimal Places (0–10)	73.19	Rounded to the chosen number of decimal places.
String	Length (1–1000), Character Set	aZ3kP9qW	Character sets: alphanumeric, alphabetic, numeric, and hexadecimal.
UUID v4	None	550e8400-e29b-41d4-a716-446655440000	36-character identifier with the version nibble fixed to 4.
Color	Format	#a3f21c	Formats: hex, `rgb(...)`, and `hsl(...)`.
Date	Start Date, End Date, Format	2026-08-14	Formats: YYYY-MM-DD, DD/MM/YYYY, MM/DD/YYYY, and YYYY-MM-DD HH:mm:ss.
Boolean	None	true	Equally likely to return `true` or `false`.

Worked Examples

Integer 1 to 6 — a die roll; one click might return 4, the next 1.
Decimal 0 to 100 with 2 places — produces values such as 37.05 or 88.40.
String, length 8, alphanumeric — yields values like Xk9m2Qz7 for use as mock identifiers.
UUID v4 — returns a 36-character token such as 9b2f1c4e-7a3d-4f01-8c5b-2e6d9a0f1b3c.
Color in hex format — returns a value such as #4f8a2c ready to paste into CSS.
Date between 2020 and 2030 — with the YYYY-MM-DD format, returns something like 2026-08-14.

Tips and Common Mistakes

Never use it for secrets — because the output is based on Math.random(), it is unsuitable for passwords, tokens, or keys.
Keep the minimum below the maximum — an inverted range yields blank lines rather than an error message.
Match the character set to the job — numeric strings are useful for IDs, while hex strings suit colour-like codes.
Limit quantity for readability — generating 1,000 lines is possible, but smaller batches are easier to scan and paste.
Remember dates include time — the timestamp format draws a random moment, not just a calendar day.
Click Generate again for variety — each run is independent, so repeating it produces a fresh set of values.

Common Use Cases

Mock data shows up almost everywhere in software work. These are the situations where a quick generator saves the most time.

Test fixtures — seed unit tests with values that avoid hard-coded assumptions.
Database seeding — populate development tables with plausible rows before a demo.
Form and UI testing — fill long input lists to check validation and layout behaviour.
Load testing payloads — build batches of request bodies for benchmarking.
Design mockups — grab random hex, RGB, or HSL colours for quick prototypes.
Tutorials and demos — illustrate code with data that is not tied to a real record.

Frequently Asked Questions

Is the random data cryptographically secure?

This tool uses Math.random(), which is suitable for testing and development but not cryptographically secure. For security-sensitive applications (e.g., generating tokens, passwords, or encryption keys), use crypto.getRandomValues() or a dedicated library.

Can I generate data in bulk?

Yes, the quantity field accepts values from 1 to 1,000. Each value is output on a separate line in the results area. For larger batches, generate multiple times or use a dedicated test data library.

What is UUID v4?

UUID v4 (Universally Unique Identifier version 4) is a 128-bit identifier generated from random numbers. It is formatted as 36 characters (32 hex digits + 4 hyphens), e.g., 550e8400-e29b-41d4-a716-446655440000. UUIDs are commonly used as database primary keys and API identifiers.

Is this tool client-side?

Yes, 100%. All generation logic runs in your browser using JavaScript. No data is sent to any server. The tool works offline after the page has loaded.

What data types can I generate?

Seven types are supported: integer, decimal, string, UUID v4, color, date, and boolean. Selecting a type swaps in the options that apply to it and clears any previous results.

How does the character set option work?

For strings you can choose alphanumeric (letters and digits), alphabetic (letters only), numeric (digits only), or hexadecimal (digits and a-f). The generated string is drawn only from the chosen set.

Can I control decimal precision?

Yes. The decimal type accepts a decimal places value from 0 to 10, and every generated number is rounded to that many places.

What happens if the minimum is greater than the maximum?

The tool returns an empty line for that value instead of raising an error. Swap the two bounds or correct the input to get valid results.