
Mockaroo
JSON Generator
MockTurtle.net
ExtendsClass's JSON generator allows to generate random JSON data from a template.

Claude Code
aider
Cursor
Ghostty
opencode
GitHub Copilot
Zed
Frontier reasoning in the terminal

Which is more popular?
Based on our record, OpenAI Codex CLI seems to be more popular. It has been mentioned 41 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | extendsclass.com | github.com |
| Pricing | — | |
| Company | 2019 | — |
| Listed in |
In their own words, as submitted to SaaSHub.


This free online tool allows to generate JSON dataset. You can generate multiple JSON files exported to a zip archive. No limits. No registration.
No description of OpenAI Codex CLI yet.
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OpenAI Codex CLI
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Share your experience with using ExtendsClass JSON Generator and OpenAI Codex CLI. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.


Tracking ExtendsClass JSON Generator since Mar 2021.
Codex takes the opposite bet: one product across six surfaces. CLI, IDE extension, Codex Cloud, the ChatGPT app sidebar, mobile (GA May 2026), and a Chrome extension. All of them share your ChatGPT account, your session history, and your... - Source: dev.to / 8 days ago
The second CLI (Codex) records tokens and quota in session files, but the laptop sleeps and moves, so Prometheus can't reliably scrape it. That's exactly the Pushgateway case: a systemd user timer parses the session files every 5 minutes... - Source: dev.to / about 1 month ago
Since when? https://learn.chatgpt.com/docs/codex/cli https://github.com/openai/codex Looks like it's still a more-or-less-open-source product called Codex CLI. FWIW, there have been issues with various versions of ChatGPT not knowing... - Source: Hacker News / about 2 months ago
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Transform hours of debugging into seconds with a single command. Experience coding at thought-speed with Claude's AI that understands your entire codebase—no more context switching, just breakthrough results.
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Create mock and sample JSON using a powerful template syntax
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aider is AI pair programming in your terminal
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Generate realistic random JSON data through a simple and intuitive GUI.
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The AI-first Code Editor. Build software faster in an editor designed for pair-programming with AI.
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