MockFlow is unclaimed —

MockFlow

Mock APIs in seconds. No account required.·mockflow.io

MockFlow is a mock API generator that lets developers create fake REST API endpoints with custom responses, headers, delays, and response profiles. It supports guest mode for instant, local browser-based mocking with no signup, and account mode for cloud-hosted endpoints with permanent, shareable URLs. It also includes a Request Catcher for webhook inspection and a set of browser-based developer utility tools.

What it's for

Frontend development without a backendAPI prototyping before backend is builtQA testing workflows for API error and edge casesMocking error responses (400, 401, 403, 404, 429, 500, 503)Testing loading and empty states in UITesting slow API responses and timeoutsDebugging API payloads and request/response structuresBuilding SaaS demos and client presentationsWebhook inspection and HTTP request debuggingConverting and inspecting API file payloads (PDF, Base64)Decoding and inspecting JWT authentication tokens

Features 16

Account mode with cloud storage and real public mock API endpoints
Add custom response headers
Base64 to PDF and PDF to Base64 converters
Built-in request runner to test endpoints inside the app
Configurable response delays to simulate slow APIs
Create mock API projects with named endpoints
Define HTTP methods: GET, POST, PUT, PATCH, DELETE
Define JSON, XML, HTML, and plain text responses
Guest mode with local browser storage and no signup
HTTP Status Code Explorer tool
JSON Formatter & Validator tool
JWT Decoder tool
Precision JSON editor with real-time schema validation
Request Catcher for webhook inspection and HTTP request debugging
Response profiles for success, error, unauthorized, and server error states
Show Your IP tool for API allowlist/firewall configuration

At a glance

free tierself-hostable

TypeWeb app

DeploymentHybrid

PlatformsWeb

ForFrontend developers, QA testers, SaaS builders, Agencies building client demos and prototypes, Product teams validating UI workflows, Developers building presentations, demos, and proof-of-concept projects

CompanyMockFlow

Resources

Docs

Pricing

Only the free Guest Mode tier has an explicitly stated price ($0). Account Mode is mentioned as having potential usage limits depending on the plan, but specific paid plan prices are not publicly listed.

Guest ModeFree

Completely free, no account required; data stored in localStorage and not sent to servers.

Local browser storage only, single device, history/logs limited to last 24 hours, instant use with no signup

Account ModeQuote

Exact pricing not specified on the pages; FAQ states 'Account features including cloud-hosted endpoints may have usage limits depending on the plan.'

Cloud-hosted endpoints; usage limits may depend on the plan