MockBolt
Paste JSON, get a live mock API in seconds. Free, no signup, supports every HTTP method.
Paste JSON, get a live mock API in seconds. Free, no signup, supports every HTTP method.
This page is designed to help you find out whether MockBolt is good and if it is the right choice for you.
MockBolt is a free, anonymous mock API builder for developers. It turns any JSON payload into a live, public API endpoint in seconds — with zero signup, zero install, and zero configuration.
Here's how it works: paste your JSON into the built-in editor, select which HTTP methods the endpoint should accept, optionally set a custom HTTP status code (any code from 100 to 599), add a response delay to simulate slow or flaky APIs, or inject custom response headers for any scenario you need to test. Hit Generate — and you immediately get a live public URL with open CORS.
That public URL works from any browser, any frontend framework (React, Vue, Angular, Svelte), any mobile app (React Native, Flutter), any API client (Postman, Insomnia, curl), or any backend service — no proxy, no configuration, no CORS errors.
Use MockBolt when: - Your backend team hasn't built the endpoint yet and you want to start on the UI - You need to test how your app handles 500 errors, timeouts, or 404s - You're building a demo or prototype and don't want to spin up infrastructure - You're running a workshop or coding tutorial and need to give students a live API immediately - You need to test a Postman collection against a predictable response
Free endpoints are public and expire after 7 days, auto-renews with traffic. You get a management URL to edit your mock anytime without creating an account. No email, no identity, no credit card — ever.
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Quick Mock API Creation
MockBolt allows users to rapidly create mock APIs without needing a backend, enabling frontend developers and testers to work independently and speed up development workflows.
Simple and Intuitive Interface
The platform offers a straightforward and user-friendly interface that makes it easy to define endpoints, set response data, and configure mock behaviors without a steep learning curve.
No Infrastructure Required
As a hosted service, MockBolt eliminates the need to set up and maintain your own mock server infrastructure, saving time and reducing operational overhead.
Useful for Prototyping and Testing
MockBolt is well-suited for prototyping new features and running integration tests by simulating API responses, allowing teams to validate their work before real APIs are available.
Customizable Responses
Users can define custom HTTP status codes, headers, and response bodies, giving them flexibility to simulate various API scenarios including error states and edge cases.
Backend: - Python + FastAPI — async API server - PostgreSQL — primary database for mock endpoints and vault data - SQLAlchemy (async) — ORM and query layer - Slowapi — rate limiting middleware - Uvicorn — ASGI server
Frontend: - React 18 + TypeScript - Vite — build tool - Tailwind CSS — styling - Monaco Editor — JSON editor (same engine as VS Code) - React Router v6 - react-helmet-async — per-page SEO meta tags
Infrastructure: - AWS Lightsail — VPS hosting (ap-south-1, Mumbai) - Docker + Docker Compose — containerised deployment - Nginx — reverse proxy + static file serving - Cloudflare — DNS, SSL, CDN, DDoS protection
Payments: - Lemon Squeezy — Merchant of Record for the $2 permanent endpoint upgrade (handles international tax compliance)
Analytics: - Google Analytics 4 — aggregate traffic metrics
MockBolt is the only mock API tool that combines all three things developers actually need: cloud-hosted, no signup, and instant. Every competing tool compromises on at least one of them.
Mockoon requires a desktop install and only works locally — there is no public URL. json-server requires Node.js and runs on your machine. Beeceptor and Mocky.io require creating an account before you can do anything.
MockBolt has none of those barriers. You open the site, paste your JSON, and you have a live public URL with open CORS in under 10 seconds — from any device, with no account, no terminal, no install.
Beyond that, MockBolt has features most competitors charge for or require accounts to use: response delay simulation (for testing loading states and timeouts), custom HTTP status codes, custom response headers, all five HTTP methods on a single endpoint, and a hit counter so you know your endpoint is being called.
The optional vault system is also unique — it gives you a persistent dashboard of all your mocks using a randomly generated key as your only identifier. No email, no password. Complete anonymity with persistence.
Choose MockBolt if you want a live mock API endpoint in under 10 seconds with no account, no install, and no local server.
Over Mockoon: Mockoon is a great desktop app, but your mock only runs while your computer is open. It has no public URL — you cannot share it with a teammate or hit it from a mobile device on a different network. MockBolt gives you a public URL immediately that works from anywhere.
Over json-server: json-server is powerful but requires Node.js, a terminal, and local setup every time. If you share a project with another developer, they have to set it all up again. MockBolt has no dependencies — open a browser, paste JSON, share the URL.
Over Beeceptor: Beeceptor requires a signup and email verification before you can create your first endpoint. MockBolt requires nothing. You are using it before you finish reading this sentence.
Over Mocky.io: Mocky requires an account, has limited method support, and minimal configuration options. MockBolt supports all HTTP methods, response delay, custom headers, and custom status codes with no account.
The $2 permanent endpoint upgrade is also unique in this space — one payment, no recurring cost, your endpoint lives forever. Competitors either do not offer persistence or charge monthly.
MockBolt's primary audience is frontend and fullstack developers who need a live API endpoint quickly during development or testing — and who do not want to spend time on setup.
More specifically:
The common thread is: developers who value their time and want to skip the setup ceremony.
MockBolt came from a recurring frustration: being in the middle of building a frontend feature and realizing the API endpoint it depends on does not exist yet.
The usual options — spinning up json-server, installing Mockoon, creating a Beeceptor account, writing a fake Express server — all take 15–30 minutes and break your flow. You end up either waiting for the backend or hardcoding data directly into the component, which you then have to undo later.
The question was simple: why can't I paste JSON and get a URL right now?
MockBolt was built to answer that question. The goal from day one was that the time from opening the site to having a working endpoint should be under 10 seconds. No signup, no install, no terminal, no dependencies. Just paste and go.
The first version was built in a weekend. The tool was used internally before it ever had a name. When it proved genuinely useful during real development work, it was refined, hardened, and launched publicly.
Today MockBolt also has a vault system (anonymous persistent accounts with no email or password), a $2 permanent endpoint upgrade via Lemon Squeezy, response delay simulation, custom headers and status codes, and a hit counter — all built based on the natural next things developers asked for after using the core tool.
MockBolt is designed to be fully anonymous — no signup, no email, no account. This means we intentionally do not know who our users are by design.
Because of this, we cannot name specific customers — and we consider that a feature, not a limitation. Every developer who uses MockBolt gets the same experience whether they are a solo student learning fetch() for the first time or a senior engineer at a large company prototyping a feature.
What we can say is that MockBolt is used by:
If you are using MockBolt and would like to be listed here, reach out at support@mockbolt.com.
We have collected here some useful links to help you find out if MockBolt is good.
Check the traffic stats of MockBolt on SimilarWeb. The key metrics to look for are: monthly visits, average visit duration, pages per visit, and traffic by country. Moreoever, check the traffic sources. For example "Direct" traffic is a good sign.
Check the "Domain Rating" of MockBolt on Ahrefs. The domain rating is a measure of the strength of a website's backlink profile on a scale from 0 to 100. It shows the strength of MockBolt's backlink profile compared to the other websites. In most cases a domain rating of 60+ is considered good and 70+ is considered very good.
Check the "Domain Authority" of MockBolt on MOZ. A website's domain authority (DA) is a search engine ranking score that predicts how well a website will rank on search engine result pages (SERPs). It is based on a 100-point logarithmic scale, with higher scores corresponding to a greater likelihood of ranking. This is another useful metric to check if a website is good.
The latest comments about MockBolt on Reddit. This can help you find out how popualr the product is and what people think about it.
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Is MockBolt good? This is an informative page that will help you find out. Moreover, you can review and discuss MockBolt here. The primary details have not been verified within the last quarter, and they might be outdated. If you think we are missing something, please use the means on this page to comment or suggest changes. All reviews and comments are highly encouranged and appreciated as they help everyone in the community to make an informed choice. Please always be kind and objective when evaluating a product and sharing your opinion.
