Mock & Test APIs
Mock and test APIs stand in for a real backend while you build a frontend or practice API testing. Most are free and keyless: JSONPlaceholder serves related posts, users and todos with simulated writes, and httpbin echoes requests back with controllable status codes and delays. Others generate data on demand, from Mockaroo's JSON, CSV or SQL output to Sampuli's format-valid IBANs and IDs for 90 countries.
| API | Pricing | Auth | Format | Free tier | Status |
|---|---|---|---|---|---|
AddressMockGenerates format-correct sample addresses (street, city, ZIP, phone) for 7 countries, for testing forms. Developer Tools › Mock & Test APIs | Free | None | JSON | Unlimited | Live |
Airport GapAirport records by IATA code, airport-to-airport distances and a favourites store for practising API tests. Developer Tools › Mock & Test APIs | Free | None | JSON | 10k+/day | Live |
Anycrap35,000+ AI-generated absurdist product concepts with names, descriptions and images for mock data. Developer Tools › Mock & Test APIs | Free | API key | JSON | — | Live |
Bacon IpsumGenerates meat-themed lorem ipsum filler text as paragraphs or sentences, in JSON, XML or plain text. Developer Tools › Mock & Test APIs | Free | None | JSON | Unlimited | Live |
BaconMockupPlaceholder meat/bacon JPEG images at any width x height, for design mockups and prototypes. Developer Tools › Mock & Test APIs | None | Binary | Unlimited | Live | |
DummyJSONFree placeholder REST API returning mock products, users, carts, posts and todos as JSON. Developer Tools › Mock & Test APIs | Free | None | JSON | Unlimited | Live |
English Random WordsRandom English words with definitions and pronunciations; also covers six other languages. Developer Tools › Mock & Test APIs | Free | None | JSON | — | Down |
ExtendsClass JSON StorageStore and fetch small JSON blobs (bins) over a simple REST API, for tutorials or mocking. Developer Tools › Mock & Test APIs | Free | API key | JSON | 100–1k/day | Untested |
FakeStoreAPIFake but realistic e-commerce data (products, carts, users, login) for prototyping shopping apps. Developer Tools › Mock & Test APIs | Free | None | JSON | Unlimited | Live |
flakyMock REST API for testing error handling: force status codes, latency or failure rates via query params. Developer Tools › Mock & Test APIs | Freemium | None | JSON | 10k+/day | Live |
Format JSON Online Dummy APIFree canned REST endpoints (users, products, orders, analytics) for frontend testing. Developer Tools › Mock & Test APIs | Free | None | JSON | Unlimited | Live |
GeneradorDNI APIGenerates fake but checksum-valid Spanish DNI/NIE/CIF numbers, IBANs, profiles and vehicle data for testing. Developer Tools › Mock & Test APIs | Freemium | None | JSON | Unlimited | Live |
GoRESTRealistic fake users, posts, comments and todos with full CRUD, reseeded daily, for testing and prototyping. Developer Tools › Mock & Test APIs | Free | API key | JSON | Unlimited | Live |
HipsumGenerates hipster-themed lorem ipsum placeholder text, plain or mixed with Latin words. Developer Tools › Mock & Test APIs | Free | None | JSON | Unlimited | Live |
HTTP CatReturns a cat image for any HTTP status code, useful for error pages and status demos. Developer Tools › Mock & Test APIs | Free | None | Binary | Unlimited | Live |
httpbinEchoes back HTTP requests for testing: headers, auth, redirects, status codes, delays, and more. Developer Tools › Mock & Test APIs | Free | None | JSON | Unlimited | Live |
ItsThisForThatGenerates random 'it's X for Y' startup-pitch name pairs as JSON, JSONP, or plain text. Developer Tools › Mock & Test APIs | None | JSON | Unlimited | Live | |
JsonFabricaGenerates synthetic, relational JSON test data from reusable templates with sequences and batch jobs. Developer Tools › Mock & Test APIs | Free trial | API key | JSON | — | Live |
JSONingReady-made fake REST endpoints (products, users, carts, coupons) for prototyping frontends without a backend. Developer Tools › Mock & Test APIs | Free | None | JSON | — | Live |
JSONPlaceholderFake posts, comments, albums, photos, todos and users with relations; POST/PUT/PATCH/DELETE are simulated Developer Tools › Mock & Test APIs | Free | None | JSON | Unlimited | Live |
LabelixaRenders ZPL/EPL/TSPL/CPCL thermal labels and barcodes to PNG/PDF, validates ZPL syntax. Developer Tools › Mock & Test APIs | Freemium | API key | Binary | 1k–10k/day | Live |
MockarooGenerates realistic fake/test data (names, addresses, etc.) as JSON, CSV, SQL or XML. Developer Tools › Mock & Test APIs | Freemium | API key | JSON | 100–1k/day | Live |
MySQL Visual EXPLAINTurns a MySQL EXPLAIN plan into an interactive, embeddable visual query plan diagram. Developer Tools › Mock & Test APIs | Free | None | JSON | — | Untested |
OYYI88+ endpoints for image editing, PDF manipulation, OCR and AI vision/document intelligence. Developer Tools › Mock & Test APIs | Freemium | API key | JSON | 100–1k/day | Untested |
PHPHubChecks PHP code for syntax errors against a chosen PHP version and returns line-numbered results. Developer Tools › Mock & Test APIs | None | JSON | — | Untested | |
PlaceBearServes placeholder bear photos at any pixel size via a simple URL pattern, no key needed. Developer Tools › Mock & Test APIs | Free | None | Binary | Unlimited | Live |
Postman EchoEchoes back request method, headers, body and query params; also test endpoints for auth, cookies and delays. Developer Tools › Mock & Test APIs | Free | None | JSON | Unlimited | Live |
Random ProfilesGenerates fake user profiles and company records, 100+ fields each, with photos for seed/test data. Developer Tools › Mock & Test APIs | Free | API key | JSON | 100–1k/day | Live |
RandommerGenerates fake names, addresses, phone numbers, text, hashes and other mock data for testing. Developer Tools › Mock & Test APIs | Freemium | API key | JSON | 1k–10k/day | Live |
RandomUserGenerates randomized fake user profiles (name, address, photo, login) for testing apps. Developer Tools › Mock & Test APIs | Free | None | JSON | Unlimited | Live |
ReqResHosted mock REST API with fake user, order and post data for testing frontend code and QA automation. Developer Tools › Mock & Test APIs | Freemium | None | JSON | 100–1k/day | Live |
restful-api.devFake CRUD REST API with sample product data for testing and prototyping HTTP clients. Developer Tools › Mock & Test APIs | Freemium | None | JSON | <100/day | Live |
RoboHashTurns any text/hash into a deterministic robot, monster, cat, or avatar image for placeholder use. Developer Tools › Mock & Test APIs | Free | None | Binary | Unlimited | Live |
SampuliGenerates synthetic, format-valid test data (people, IBANs, IDs, VINs) for 90 countries, no key needed. Developer Tools › Mock & Test APIs | Free | None | JSON | Unlimited | Live |
Softwium SQL ValidatorChecks MySQL-style SQL query syntax and returns parser errors with line/column locations. Developer Tools › Mock & Test APIs | Free | None | JSON | Unlimited | Untested |
Status PizzaReturns a pizza-themed image or JSON for any HTTP status code, for demos and error pages. Developer Tools › Mock & Test APIs | None | Binary | Unlimited | Live | |
ToolForte150 utility endpoints: IBAN/VAT validation, cron parsing, regex testing, format conversion, Dutch test data. Developer Tools › Mock & Test APIs | Freemium | API key | JSON | <100/day | Untested |
TotalShiftLeft SandboxSandbox with mock REST, GraphQL and SOAP endpoints plus 17 auth schemes for practicing API tests. Developer Tools › Mock & Test APIs | Free | None | JSON | 10k+/day | Live |
UUID GeneratorGenerates v1, v3, v4, v5 and timestamp-first UUIDs, singly or in bulk, and decodes existing ones. Developer Tools › Mock & Test APIs | Free | None | JSON | 10k+/day | Live |
Waldrand AvatarGenerates a stable SVG, PNG or WebP avatar/identicon from any string, no key or account needed. Developer Tools › Mock & Test APIs | Free | None | Binary | 10k+/day | Live |
What The CommitRandom, joke commit-message generator, also available as plain text or JSON with a permalink. Developer Tools › Mock & Test APIs | None | JSON | Unlimited | Live | |
Yes NoReturns a random yes, no, or rare maybe answer with a matching reaction GIF; supports forcing an answer. Developer Tools › Mock & Test APIs | Free | None | JSON | Unlimited | Live |
AddressMockFreeLive
Generates format-correct sample addresses (street, city, ZIP, phone) for 7 countries, for testing forms.
None · JSON
Unlimited
OpenAPI spec · llms.txt
Airport GapFreeLive
Airport records by IATA code, airport-to-airport distances and a favourites store for practising API tests.
None · JSON
10k+/day
no machine-readable spec
AnycrapFreeLive
35,000+ AI-generated absurdist product concepts with names, descriptions and images for mock data.
API key · JSON
—
no machine-readable spec
Bacon IpsumFreeLive
Generates meat-themed lorem ipsum filler text as paragraphs or sentences, in JSON, XML or plain text.
None · JSON
Unlimited
no machine-readable spec
BaconMockupLive
Placeholder meat/bacon JPEG images at any width x height, for design mockups and prototypes.
None · Binary
Unlimited
no machine-readable spec
DummyJSONFreeLive
Free placeholder REST API returning mock products, users, carts, posts and todos as JSON.
None · JSON
Unlimited
no machine-readable spec
English Random WordsFreeDown
Random English words with definitions and pronunciations; also covers six other languages.
None · JSON
—
no machine-readable spec
ExtendsClass JSON StorageFreeUntested
Store and fetch small JSON blobs (bins) over a simple REST API, for tutorials or mocking.
API key · JSON
100–1k/day
OpenAPI spec
FakeStoreAPIFreeLive
Fake but realistic e-commerce data (products, carts, users, login) for prototyping shopping apps.
None · JSON
Unlimited
OpenAPI spec
flakyFreemiumLive
Mock REST API for testing error handling: force status codes, latency or failure rates via query params.
None · JSON
10k+/day
OpenAPI spec · llms.txt
Format JSON Online Dummy APIFreeLive
Free canned REST endpoints (users, products, orders, analytics) for frontend testing.
None · JSON
Unlimited
llms.txt
GeneradorDNI APIFreemiumLive
Generates fake but checksum-valid Spanish DNI/NIE/CIF numbers, IBANs, profiles and vehicle data for testing.
None · JSON
Unlimited
no machine-readable spec
GoRESTFreeLive
Realistic fake users, posts, comments and todos with full CRUD, reseeded daily, for testing and prototyping.
API key · JSON
Unlimited
no machine-readable spec
HipsumFreeLive
Generates hipster-themed lorem ipsum placeholder text, plain or mixed with Latin words.
None · JSON
Unlimited
no machine-readable spec
HTTP CatFreeLive
Returns a cat image for any HTTP status code, useful for error pages and status demos.
None · Binary
Unlimited
no machine-readable spec
httpbinFreeLive
Echoes back HTTP requests for testing: headers, auth, redirects, status codes, delays, and more.
None · JSON
Unlimited
OpenAPI spec
ItsThisForThatLive
Generates random 'it's X for Y' startup-pitch name pairs as JSON, JSONP, or plain text.
None · JSON
Unlimited
no machine-readable spec
JsonFabricaFree trialLive
Generates synthetic, relational JSON test data from reusable templates with sequences and batch jobs.
API key · JSON
—
llms.txt
JSONingFreeLive
Ready-made fake REST endpoints (products, users, carts, coupons) for prototyping frontends without a backend.
None · JSON
—
no machine-readable spec
JSONPlaceholderFreeLive
Fake posts, comments, albums, photos, todos and users with relations; POST/PUT/PATCH/DELETE are simulated
None · JSON
Unlimited
no machine-readable spec
LabelixaFreemiumLive
Renders ZPL/EPL/TSPL/CPCL thermal labels and barcodes to PNG/PDF, validates ZPL syntax.
API key · Binary
1k–10k/day
MCP server · llms.txt
MockarooFreemiumLive
Generates realistic fake/test data (names, addresses, etc.) as JSON, CSV, SQL or XML.
API key · JSON
100–1k/day
no machine-readable spec
MySQL Visual EXPLAINFreeUntested
Turns a MySQL EXPLAIN plan into an interactive, embeddable visual query plan diagram.
None · JSON
—
OpenAPI spec
OYYIFreemiumUntested
88+ endpoints for image editing, PDF manipulation, OCR and AI vision/document intelligence.
API key · JSON
100–1k/day
llms.txt
PHPHubUntested
Checks PHP code for syntax errors against a chosen PHP version and returns line-numbered results.
None · JSON
—
no machine-readable spec
PlaceBearFreeLive
Serves placeholder bear photos at any pixel size via a simple URL pattern, no key needed.
None · Binary
Unlimited
no machine-readable spec
Postman EchoFreeLive
Echoes back request method, headers, body and query params; also test endpoints for auth, cookies and delays.
None · JSON
Unlimited
llms.txt
Random ProfilesFreeLive
Generates fake user profiles and company records, 100+ fields each, with photos for seed/test data.
API key · JSON
100–1k/day
OpenAPI spec · MCP server · llms.txt
RandommerFreemiumLive
Generates fake names, addresses, phone numbers, text, hashes and other mock data for testing.
API key · JSON
1k–10k/day
OpenAPI spec
RandomUserFreeLive
Generates randomized fake user profiles (name, address, photo, login) for testing apps.
None · JSON
Unlimited
no machine-readable spec
ReqResFreemiumLive
Hosted mock REST API with fake user, order and post data for testing frontend code and QA automation.
None · JSON
100–1k/day
llms.txt
restful-api.devFreemiumLive
Fake CRUD REST API with sample product data for testing and prototyping HTTP clients.
None · JSON
<100/day
no machine-readable spec
RoboHashFreeLive
Turns any text/hash into a deterministic robot, monster, cat, or avatar image for placeholder use.
None · Binary
Unlimited
no machine-readable spec
SampuliFreeLive
Generates synthetic, format-valid test data (people, IBANs, IDs, VINs) for 90 countries, no key needed.
None · JSON
Unlimited
llms.txt
Softwium SQL ValidatorFreeUntested
Checks MySQL-style SQL query syntax and returns parser errors with line/column locations.
None · JSON
Unlimited
no machine-readable spec
Status PizzaLive
Returns a pizza-themed image or JSON for any HTTP status code, for demos and error pages.
None · Binary
Unlimited
no machine-readable spec
ToolForteFreemiumUntested
150 utility endpoints: IBAN/VAT validation, cron parsing, regex testing, format conversion, Dutch test data.
API key · JSON
<100/day
OpenAPI spec · llms.txt
TotalShiftLeft SandboxFreeLive
Sandbox with mock REST, GraphQL and SOAP endpoints plus 17 auth schemes for practicing API tests.
None · JSON
10k+/day
OpenAPI spec · llms.txt
UUID GeneratorFreeLive
Generates v1, v3, v4, v5 and timestamp-first UUIDs, singly or in bulk, and decodes existing ones.
None · JSON
10k+/day
no machine-readable spec
Waldrand AvatarFreeLive
Generates a stable SVG, PNG or WebP avatar/identicon from any string, no key or account needed.
None · Binary
10k+/day
no machine-readable spec
What The CommitLive
Random, joke commit-message generator, also available as plain text or JSON with a permalink.
None · JSON
Unlimited
no machine-readable spec
Yes NoFreeLive
Returns a random yes, no, or rare maybe answer with a matching reaction GIF; supports forcing an answer.
None · JSON
Unlimited
no machine-readable spec
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Choosing a Mock & Test APIs API
Is there a free Mock & Test APIs API?
Yes. JSONPlaceholder, DummyJSON, httpbin, AddressMock, Airport Gap and 21 others are free to use, and flaky, GeneradorDNI API, Labelixa, Mockaroo, OYYI and 4 others have a free tier alongside paid plans.
Which Mock & Test APIs work without an API key?
JSONPlaceholder, DummyJSON, httpbin, AddressMock, Airport Gap and 26 others need no key or sign-up, so you can try them with a plain request.
Can I call a Mock & Test APIs API from front-end JavaScript?
JSONPlaceholder, DummyJSON, httpbin, AddressMock, Airport Gap and 17 others allow cross-origin requests and need no key, so they work straight from the browser. For the others, call them from your server so your key stays private.
Can I use Mock & Test APIs in a commercial project?
AddressMock, Format JSON Online Dummy API, HTTP Cat, JsonFabrica, Labelixa and 2 others permit commercial use. ReqRes restricts it, for example to non-commercial or attributed use, so read the terms first.
Which Mock & Test APIs work with AI agents?
Random Profiles has both an MCP server and an OpenAPI spec. Labelixa has an MCP server, so an AI agent can call it directly. httpbin, AddressMock, ExtendsClass JSON Storage, FakeStoreAPI, flaky and 4 others publish an OpenAPI spec for generating clients and tools.
More specific: Fake REST API · Fake Store API · Random User APIs
More in Developer Tools: Code Execution APIs · Monitoring APIs · Web Scraping APIs · Package Registries APIs · API Directories APIs · WHOIS & DNS APIs · SEO APIs · Search & SERP APIs · Hosting APIs