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Mock Data Generator
Paste real JSON, get 1,000 coherent rows that match it
A free, privacy-first mock data generator for developers that creates coherent, reproducible datasets. Generate data using a field picker, a pasted JSON sample, or JSON Schema. Emails, locations, and timestamps stay logically consistent. Use a seed for identical output every time. Export unlimited JSON, NDJSON, or CSV. Runs entirely client-side, works offline, and requires no signup.
Hey Product Hunt 👋
I build developer tools at jsondevtools.org, and mock data generators kept frustrating me for two reasons: most cap your rows or want a signup, and the ones that don't still generate junk — a row where the name is "Alice Smith" but the email is "[email protected]" and the city, state, and ZIP belong to three different places.
So I built one that fixes the second problem, not just the first.
What's different:
🧩 Paste a real JSON sample → get more like it. Drop in one object or an array, and it infers a generator per field, then produces as many lookalike rows as you want. Fastest path from "here's my shape" to "here's 5,000 rows of it."
🔗 Coherent rows. Email and username derive from that row's name. City/state/ZIP come from one real location. updatedAt is never before createdAt. The values in a row actually make sense together.
🎲 Seeded & deterministic. Type anything into the seed box and the same schema produces byte-identical output every run — great for snapshot tests and shareable fixtures.
🔒 100% in your browser. Your schema and sample never leave your device. Works offline. No row cap, no signup.
Three ways in: a field-picker schema builder, paste-a-sample inference, or a JSON Schema. Export JSON, NDJSON, or CSV.
It's free and I'm actively building v2 (SQL export, relational/linked entities with real foreign-key coherence). Would genuinely love feedback on what'd make this part of your actual workflow — reply here and I'll read every comment.
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About Mock Data Generator on Product Hunt
“Paste real JSON, get 1,000 coherent rows that match it”
Mock Data Generator was submitted on Product Hunt and earned 4 upvotes and 1 comments, placing #156 on the daily leaderboard. A free, privacy-first mock data generator for developers that creates coherent, reproducible datasets. Generate data using a field picker, a pasted JSON sample, or JSON Schema. Emails, locations, and timestamps stay logically consistent. Use a seed for identical output every time. Export unlimited JSON, NDJSON, or CSV. Runs entirely client-side, works offline, and requires no signup.
Mock Data Generator was featured in Productivity (655.7k followers) and Developer Tools (515.5k followers) on Product Hunt. Together, these topics include over 219.8k products, making this a competitive space to launch in.
Who hunted Mock Data Generator?
Mock Data Generator was hunted by pasindu Ishan. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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pasindu Ishan