Developer data utility

No signup · no API keys · CORS open

Random data APIs, built like developer tools.

Useful mock fixtures and curated reference data with parameters that genuinely work. Pick an endpoint, shape the response and fetch clean JSON — without provisioning anything.

Browse the catalog Read the conventions Follow a guide

GET /api/users?count=2&seed=7&fields=fullName,email,age

{
  "data": [
    {
      "fullName": "Milford Schimmel",
      "email": "milford.schimmel@example.com",
      "age": 71
    },
    {
      "fullName": "Jonas Torp",
      "email": "jonas.torp@example.org",
      "age": 55
    }
  ],
  "meta": {
    "endpoint": "users",
    "count": 2,
    "seed": 7,
    "locale": "en",
    "params": {
      "minAge": 18,
      "maxAge": 80
    },
    "generatedAt": "2026-10-23T16:54:10.000Z"
  }
}

Actual API response. seed=7 returns these records every time.

Endpoints: 159
Routes: 341
Mock APIs: 77
Real APIs: 82
Data locales: 8
Holiday countries: 61
Requests / minute: 60
Requests / day: 10,000

Verified by contract and source

Every documented parameter is contract-tested. Real endpoints cite authoritative material such as ISO 4217, the IANA Time Zone Database and national statutory holiday rules. Read the public data methodology for badge meaning, source pinning and partial coverage.

Quick start

From empty file to useful fixture

Three steps. No setup.

01 / PICK

Choose the domain

Find an endpoint in the catalog — for example, fake users.

/api/users

02 / SHAPE

Set meaningful parameters

Control count, locale, ranges and projected fields. The documented controls are the real contract.

?count=25&locale=de&minAge=21

03 / FETCH

Use it from any stack

Browser, backend, curl or CI — responses are CORS-open and use a consistent envelope.

await fetch(url).then(r => r.json())

Proven starting points

Start with a high-value endpoint

All 159 endpoints

Public holidays

/api/holidays

REAL DATA

Real public holidays for 61 countries, computed from official national rules — list a year, check a date, or get the next upcoming holiday.

/api/holidays?country=DK&year=2026

Users

/api/users

MOCK DATA

Complete fake people — name, age-consistent birth date, email, phone, job and address — with working filters for gender, age range and email domain.

/api/users?count=3&seed=42

Placeholder images

/api/images

MOCK DATA

Hotlinkable SVG placeholder images at any size from 8 to 4000 px — custom label, colors and an optional gradient. Deterministic and crisp at every scale.

/api/images/placeholder

Real reference data

Complete datasets, pinned to their source

Bundled snapshots · no request-time network

Postal Code Lookup API

/api/postal-codes

REAL DATA

Look up real postal codes in 21 countries — place, region, coordinates and GeoNames accuracy — with each country's coverage stated, not implied.

Postal codes: 336,034
Countries: 21

Country Statistics API

/api/country-stats

REAL DATA

Population, GDP, life expectancy and five more World Bank indicators for 215 countries, 1960–2025: latest value, one year, a full annual series or a ranking.

Observations: 119,402
Countries: 215
Indicators: 8
Years: 66

World Cities API

/api/cities

REAL DATA

31,000+ world cities from a pinned GeoNames snapshot: coordinates, IANA timezone, elevation, population and capital flag — filter, search or rank by distance.

Populated places: 31,793
Countries & territories: 245
Capitals: 240
Time zones: 361

Port Number & Service Lookup API

/api/ports

REAL DATA

Look up which service IANA registered for a TCP/UDP port, or search services by name — the complete registry for ports 0-49151, verbatim with every reference.

Registry rows: 13,463
Service names: 6,341

University Domains & Email Verification API

/api/universities

REAL DATA

Search 10,254 universities and colleges in 199 countries, resolve a domain like mit.edu to its institution, and check if an email is a university address.

Institutions: 10,254
Domains: 10,574
Countries & territories: 199

Airport Codes API

/api/airports

REAL DATA

Every scheduled-service airport with an IATA code — 4,159 rows with ICAO code, city, country, coordinates, elevation, time zone and 5,660 runways.

Airports: 4,159
Runways: 5,660
Countries & territories: 235

Unicode Emoji API

/api/emoji

REAL DATA

All 3944 fully-qualified Unicode 17.0 emoji with groups, CLDR keywords and code points — plus grapheme-correct emoji counting for any text.

Emoji sequences: 3,944
Groups: 9
Subgroups: 98

MIME Type Lookup API

/api/mime-types

REAL DATA

The complete IANA media type registry with file extensions merged in — look up any type or extension, or strictly parse a Content-Type value into its parts.

Media types: 2,686
File extensions: 1,248

ISO 3166 Countries API

/api/countries

REAL DATA

All 249 ISO 3166-1 countries and territories: codes, capitals, currencies, languages, area in km², continent, ccTLD, calling codes, flags and map points.

Countries & territories: 249
Fields per country: 17

Browse by domain

9 focused API categories

Curated for real development workflows

People

7 endpoints

Fake people, names and contact details for fixtures and demos.

/addresses · /emails · /jobs · /mrz

Geo & Reference

24 endpoints

Countries, cities, airports and currencies, plus safe coordinate and flight fixtures.

/address-formats · /airports · /cities · /coordinate-formats

Date & Time

11 endpoints

Public holidays, business-day math, current time, random dates and calendar-event fixtures.

/bookings · /business-days · /calendar-events · /date-info

Internet & Devices

19 endpoints

IPv4/IPv6 tools, DNS fixtures, IP/TLD references, user agents, UUIDs and passwords.

/crawlers · /dns-record-types · /dns-records · /email-messages

Text & Content

15 endpoints

Placeholder text, conversations, support tickets, tasks, markdown and reviews.

/collation · /conversations · /emoji · /form-submissions

Commerce & Finance

15 endpoints

Products, orders, inventory, returns, subscriptions, shipments and finance fixtures.

/cloud-costs · /companies · /credit-cards · /ibans

Design & Media

10 endpoints

Colors, placeholder images, avatars and file metadata.

/avatars · /barcodes · /charts · /color-contrast

Developer Tools

54 endpoints

HTTP/Unicode standards, CI and deployment fixtures, telemetry, queues, webhooks and feature flags.

/access-control · /analytics-sessions · /audit-logs · /auth-sessions

Numbers & Chance

4 endpoints

Random numbers, dice notation and weighted decisions.

/dice · /distributions · /numbers · /random

Platform guarantees

Predictable behavior before decoration

No auth ceremony

No signup, tokens or paywall. Compose a URL and fetch it from any stack.

Every parameter works

Filters filter, ranges constrain and unknown values fail clearly instead of returning the wrong record.

Reproducible fixtures

The same seed and resolved inputs return the same data, including explicit replay windows for time-shaped mocks.

Honest provenance

Generated fixtures are labelled mock. Curated facts are labelled real and carry their source.

Reference

Common implementation questions

Is randomapi.dev really free?

Yes. Every endpoint is free to use with no API key, no signup and no credit card. Generous per-IP rate limits (60 requests/minute, 10,000/day) keep the platform healthy.

What's the difference between mock and real data?

Every endpoint is badged. MOCK endpoints return generated, fake data (users, products, passwords) — perfect for test fixtures. REAL endpoints return authoritative, curated facts (public holidays, countries, currencies, HTTP statuses) you can rely on.

Can I get the same data every time?

Yes — pass a seed and the same resolved parameters to a mock endpoint and the exact same records come back. Time-window fixtures echo resolved dates in meta.params so you can replay them explicitly on another day.

Which formats are supported?

JSON (default, with a consistent data/meta envelope), NDJSON for streaming pipelines, and CSV for spreadsheets. Add unwrap=true for raw JSON without the envelope.

Can I use it in production?

Mock endpoints are designed for development, testing and demos. Real endpoints (holidays, countries, currencies…) serve curated reference data suitable for light production use within the rate limits.