Spin up live HTTPS mock endpoints in seconds. Set any status code, latency, or response body — no backend, no installs, no waiting.
No credit card. No setup. Works in under 60 seconds.
Frontend and mobile teams waste days waiting for APIs that aren't ready. Every existing mock API solution is either too complex to set up or too limited to be useful.
Feature development stalls because the mock API endpoints you need aren't ready yet. Sprint velocity tanks while you wait for a backend that may ship weeks later.
json-server, hardcoded JSON files, and if-statements in your fetch logic are messy. They only work on your machine, break on merge, and can't simulate real network latency or errors.
WireMock requires a JVM. Mockoon requires a desktop install. Postman mock servers are buried behind a paid plan. All of this for a fake REST API that should take 60 seconds to create.
MockJet is used by frontend developers, QA engineers, mobile teams, and full-stack teams who need a fake REST API running now — not after the backend ships.
Build React, Vue, or Angular components against a real live HTTPS endpoint before the backend exists. No more hardcoded JSON or conditional fetch logic — swap the mock URL for the real one when it's ready.
Simulate every edge case your real API won't reliably produce — 429s, 503s, slow responses, empty arrays, malformed JSON — on demand, every time, without touching a staging environment.
Develop iOS and Android apps against stable mock API endpoints. Share URLs across the team without running a local server or opening ngrok tunnels. Works from any device on any network.
Point integration tests at a MockJet endpoint to decouple your pipeline from flaky third-party APIs or unstable staging environments. Consistent responses, zero setup, always available.
Wire real data into Figma prototypes, demos, and client presentations. Create a fake API endpoint in under a minute and show stakeholders a working product — no engineer required.
Agree on an API contract upfront, publish it as a mock server, and let frontend and backend build in parallel. No more blocked sprints, no more "waiting for the backend" stories in your backlog.
No CLI, no config files, no Docker. Just your browser.
Sign in with Google and create a project. You get a unique base URL instantly.
Choose the HTTP method, path, and set up one or more response variants.
Set status codes, headers, body JSON, delays, and simulate timeouts.
Point your app at the mock URL. Watch live request logs stream in real-time.
MockJet packs every feature a real mock API server needs — response modes, latency simulation, live logs, Postman import — with zero configuration overhead.
Create fake REST API endpoints in seconds — any HTTP method, path, status code, and JSON body. Your live HTTPS mock URL is ready the moment you save.
Static always returns the same response. Sequential rotates through a list. Random picks one unpredictably — simulate real-world variance.
Add a custom delay in milliseconds to any mock response. Enable timeout mode to return a 504 and test how your app handles slow or failing APIs — no real slow API needed.
See every incoming request in real-time. Method, headers, body, IP, and which response was returned. Debug without guessing.
Import an existing Postman Collection v2.1 to scaffold your project in one click. Export back to Postman anytime.
Invite teammates as editors or viewers. Share projects without sharing credentials. Role-based access control built in.
Set any response headers per response — Content-Type, Authorization, CORS headers, rate-limit headers, anything your client expects.
Copy a ready-to-run curl command for any endpoint, including request body example and correct headers. Perfect for sharing with teammates.
Define routes with named parameters like /users/:id. MockJet matches them all and routes to the right mock.
Return different responses based on what's in the request. Match on body fields, headers, or query params using rules like body.role eq admin or header.Authorization not_exists. Test auth flows, validation errors, and edge cases — no backend code needed.
Every response body can contain live template variables that resolve fresh on each request — {{uuid}}, {{randomEmail}}, {{randomInt(1,999)}}, {{timestamp}}, and more. Realistic random data, zero effort.
Get a unique HTTPS URL, send any HTTP request to it, and watch it arrive instantly. Full headers, body, IP, and geo-location streamed live. History persists in your browser — never lose a request. Configure the exact response the URL returns to the sender. A free webhook.site and RequestBin alternative.
Point any HTTP client at your MockJet URL. Here's what that looks like.
Everything you need to build and test mock APIs. Free, no card required.
Yes — this is called conditional response routing. You attach match rules to any response. A rule has three parts: where to look (body, header, or query), what field to check, and which operator to use.
Available operators: eq, neq, contains, not_contains, regex, exists, not_exists.
Examples:
header.Authorization not_existsbody.role eq adminbody.email not_existsquery.filter eq noneRules are evaluated in sort order — the first response whose rules all pass is returned. Responses with no rules are catch-alls, handled by the endpoint's fixed/random/sequential mode. No code, no backend.
MockJet supports dynamic response templating. Place {{variable}} tokens anywhere in your response body — they resolve to fresh values on every request.
Available tokens:
{{uuid}} — UUID v4{{timestamp}} — ISO 8601 UTC timestamp{{timestamp_ms}} — Unix milliseconds{{randomBool}} — true or false{{randomInt(1,1000)}} — integer in range{{randomFloat(0.5,99.9,2)}} — decimal with precision{{randomName}} — full name{{randomEmail}} — email address{{randomPhone}} — phone number{{randomItem(pending,processing,complete)}} — pick from listExample: {"id":"{{uuid}}","name":"{{randomName}}","created":"{{timestamp}}"} returns unique realistic data on every hit.
MockJet gives you two approaches:
1. Conditional routing — add a rule to any response so the error only fires when the request matches. For example: return HTTP 401 when header.Authorization not_exists, return HTTP 429 when body.qty regex ^[5-9]\d{2,}, or return HTTP 500 for a specific endpoint path. This lets you test your error-handling UI against a real HTTPS endpoint with no backend.
2. Static error response — just create a response with status code 400, 401, 403, 404, 422, 429, 500, 502, or 503 and set it as the active response. Switch between happy-path and error-path with one click in the dashboard.
You can also enable timeout mode to make the endpoint hang for a configurable delay and then return a 504 Gateway Timeout — useful for testing loading states and request cancellation.
Yes. Using conditional response routing, you can make a single endpoint behave exactly like an auth-aware API. A common setup looks like this:
header.Authorization not_existsbody.role eq viewerbody.role eq adminMockJet evaluates rules in sort order — the first match wins. Your frontend team can test the full auth flow — missing token, insufficient permissions, valid admin token — against a live HTTPS URL from day one. No backend, no token issuance, no staging environment.
Yes. MockJet includes a built-in webhook inspector. You get a unique HTTPS URL that accepts any HTTP request from any sender. Open the inspector page and incoming requests stream in real-time — showing the full method, path, headers, body, sender IP address, and geo-location (country, city, ISP).
Request history is persisted in your browser's localStorage so you never lose it on page reload. You can:
No install, no linking required — just create a webhook, copy the URL, and start sending requests.
Yes. Like webhook.site and RequestBin, MockJet gives you a unique HTTPS URL that captures any incoming HTTP webhook request and displays full headers, body, method, and sender IP in real-time.
MockJet adds on top:
All features are available on the free plan with no install required.
Your mock is 60 seconds away. No credit card, no setup, no drama.