Dev tools · alternatives · 2026

24 alternatives to JSONing Mock API

Free and open source fake API for testing and prototyping

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.

1. 1
   Mock API Generator▲555

   Generate custom data & API to build apps in less than 30s

   2021 · retool.com · its alternatives →

2. 2
   Pollux▲82

   Fake json data & json server mock API generator with JWT

   2021 · mohammedal-rowad.github.io · its alternatives →

3. 3
   Mock API Generator▲17

   API Mocks Prototyping

   2020 · mock-api-builder.vercel.app · its alternatives →

4. 4
   MockThis▲80

   Generate mock data using AI

   2023 · its alternatives →

5. 5
   JSON url▲119

   Mock backend with JSON generated from URL

   2022 · jsonurl.com · its alternatives →

6. 6
   Fake API for Devs▲8

   Free mock api generator for developers | instant test data

   Nov 2025 · fakeapifordevs.vercel.app · its alternatives →

7. 7
   FakeURL▲6

   Free online api mocking tool | mock api generator

   2025 · fakeurl.dev · its alternatives →

8. 8
   JSON Generator▲139

   Create mock and sample JSON using a powerful template syntax

   2014 · json-generator.com · its alternatives →

9. 9
   JSON Api▲175

   Hosted API's to develop your app for free 🙌

   2020 · jsonapi.co · its alternatives →

10. 10
    Mockaroo▲354

    A realistic data generator to test your app

    2015 · mockaroo.com · its alternatives →

11. 11MO
    Mockit – Open-source app to create and configure HTTP mocked endpoints▲158

    2019 · mockit.netlify.com · its alternatives →

12. 12GJ
    Generate JSON mock data for testing/initial app development▲103

    Easily create complex JSON data structures using intuitive templates.

    2023 · jsongenerator.io · its alternatives →

13. 13
    HTTP Mock – Intercept, debug and mock HTTP(S) with zero setup▲341

    Beautiful, cross-platform & open-source tools for debugging, testing and building with HTTP(S), on Windows, Linux & Mac.

    2019 · httptoolkit.tech · its alternatives →

14. 14
    apiJuice▲223

    Create a hosted API for anything in seconds

    2025 · apijuice.com · its alternatives →

15. 15
    AI-Powered Mock API Generator▲86

    Generate customized, realistic mock data & APIs, via GPT

    2023 · its alternatives →

16. 16
    Mock Turtle▲72

    GUI approach to generating realistic mock JSON data

    2022 · mockturtle.net · its alternatives →

17. 17
    MockAPI Dog▲122

    Instant mock REST & LLM APIs - free, no signup required

    Feb 2026 · mockapi.dog · its alternatives →

18. 18
    Mocktail – Free, open-source mock API server with a built-in dashboard▲25

    Hi HN, I built the first version of Mocktail years ago. I recently came back to the project, and after a pretty substantial rebuild, v4 is now out. Mocktail is a free and open-source, self-hosted mock API server with a built-in dashboard and database, packaged as a single ~25 MB binary. You can run it locally or on your own infrastructure — no account or hosted service required. You can define endpoints and responses, generate realistic data per request, customize headers, status codes and latency, and inspect incoming requests in real time. With v4, I also added MCP support, so coding…

    Aug 2026 · getmocktail.com · its alternatives →

19. 19
    Mockoon – mock REST APIs in seconds▲68

    Mockoon is the easiest and quickest way to run mock REST API servers. No remote deployment, no account required, free, open source and cross-platform.

    2017 · mockoon.com · its alternatives →

20. 20
    Instant API – Build type-safe web APIs with JavaScript▲102

    Hey there HN! I just wrapped up an all-day documentation spree for Instant API, a JavaScript framework for easily building web APIs that implements type safety at the HTTP interface. It uses a function-as-a-service approach combined with a slightly modified JSDoc spec to automatically enforce parameter and schema validation before HTTP requests make it through to your code. You just write comments above your endpoint functions and voila, enforced type safety contracts between your API endpoints and your developers. OpenAPI specifications are generated automatically as a byproduct of simply…

    2023 · github.com · its alternatives →

21. 21
    Mock Maker▲93

    Effortless mock APIs for seamless testing & prototyping

    2024 · its alternatives →

22. 22
    Generate JSON▲77

    AI-generated dummy JSON - deploy in seconds

    2023 · jsonviewer.stack.hu · its alternatives →

23. 23
    FakeJSON▲6

    A realistic test data API to make or break your app

    2018 · its alternatives →

24. 24
    Mocka▲3

    Instant Mock APIs for Devs, No JSON Required!

    2025 · mocka.ouim.me · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →