Dev tools · alternatives · 2026
24 alternatives to ReqRes Pro - custom JSON
Add custom JSON responses to your own endpoints
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.
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Generate custom data & API to build apps in less than 30s
2021 · its alternatives →
- 2MA
2016 · github.com · its alternatives →
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JSON Generator▲139Create mock and sample JSON using a powerful template syntax
2014 · its alternatives →
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- 10GJ
2023 · jsongenerator.io · its alternatives →
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- 13AJ
Hey HN, we’re building an open specification that lets agents discover and invoke APIs with natural language, built on the OpenAPI standard. agents.json clearly defines the contract between LLMs and API as a standard that's open, observable, and replicable. Here’s a walkthrough of how it works: https://youtu.be/kby2Wdt2Dtk?si=59xGCDy48Zzwr7ND. There’s 2 parts to this: 1. An agents.json file describes how to link API calls together into outcome-based tools for LLMs. This file sits alongside an OpenAPI file. 2. The agents.json SDK loads agents.json files as tools for an LLM that…
2025 · github.com · its alternatives →
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MockAPI Dog▲122Instant mock REST & LLM APIs - free, no signup required
Feb 2026 · mockapi.dog · its alternatives →
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Real API data in your mockups made as easy as lorem ipsum.
Jun 2026 · paintbyjson.com · its alternatives →
- 16RA
2014 · reqr.es · its alternatives →
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Random JSON generator with Mock Rest Api Support
Mar 2026 · jsonplace.com · its alternatives →
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Beautify, format, and align JSON instantly 100% free online.
2025 · jsonalign.pro · its alternatives →
- 20MC
2017 · mockrest.com · its alternatives →
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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…
25d ago · getmocktail.com · its alternatives →
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Create mock APIs in seconds with AI. Ship prototypes faster.
Dec 2025 · mocknica.dev · its alternatives →
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Free and open source fake API for testing and prototyping
Nov 2025 · jsoning.com · its alternatives →
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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 →