Generate mock CSV rows
Define your columns and pump out up to 5,000 fake CSV rows — names, emails, phones, dates, UUIDs, booleans, integers, decimals. Properly escaped, ready to download.
Define columns then click Generate
How to generate mock CSV
Define columns (name + type), pick a row count, and the tool generates properly escaped CSV ready to drop into a seed script or import wizard.
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Edit columns
Type a column name, pick a type — uuid, name, email, integer, decimal, date, boolean, phone.
Inputs are treated as UTF-8 throughout the pipeline and validated client-side as you type — nothing dispatches until the value is well-formed.
schemainpututf-8client-sidevalidatedcols · text4 · setid, full_name, email, signup_date
loaded · parsedclient-side - 02
Choose rows
1 to 5,000 rows via the slider.
Each toggle re-computes through a memoised hook, so flipping options never resets your input and the UI stays snappy on large inputs.
countoptionslivememoisedtogglesrows · memoised50 · live50 fake rows
options set · memoisedlive - 03
Generate
CSV escapes commas, quotes, and newlines automatically.
Randomness — where used — comes from
crypto.getRandomValues, neverMath.random. Heavy work sits inuseMemo.bulkcomputeinstantlocaldeterministicout · instantcsv · computedAlice Smith,alice.smith@…
computed · instantinstant - 04
Copy or download
Grab as .csv or copy to clipboard.
Copy writes through
navigator.clipboardand downloads use aBlob— zero network traffic. Same input plus same options always yield the same bytes.exportcopydownloadzero-networkreproducible✓ · copiedready · copied✓ mock.csv
shipped · ready to shipsuccess
Pro tips for everyday utilities
Reach for crypto.getRandomValues
Cryptographically random for IDs, tokens, salts. Math.random is for animation and games, not security.
Mock data with seeds
Faker-style libraries can be seeded so tests are reproducible. Embed the seed in the fixture file.
Reference cards beat memory
Cheatsheets for Vim, Git, Docker, Linux signals are faster than man pages when you’re mid-flow.
Browser APIs vary
Touch events, gamepads, and clipboard differ across vendors. Feature-detect before use.
Persist in the right place
localStorage for user preferences, sessionStorage for transient state, IndexedDB for structured data.
When to generate mock CSV
Seed data, import testing, demos.
Database seed
Bulk-insert fake rows for development. Random values come from crypto.getRandomValues — cryptographically secure for tokens, salts, and session IDs. Math.random is deterministic enough for animations but predictable enough to be a security bug.
CSPRNG-backedImport-wizard QA
Stress test CSV upload paths with valid data. Pair with hashids, ULID, or UUID v7 when you need both random and sortable — useful for primary keys, public-facing IDs, and event log ordering without a sequence column.
reproducibleSpreadsheet demos
Drop into Excel or Sheets without real data. Output is deterministic given the same seed, so fixtures and tests stay reproducible across CI runs and contributor machines. Embed the seed in the fixture file for full replay.
snappyETL pipelines
Test parsers without exposing production rows. Heavy work runs through useMemo so the UI stays snappy on large inputs. Same input + same options yields identical bytes — the kind of stability snapshot tests rely on.
feature-detectedLoad tests
Generate big files for throughput tests. Storage tools persist to the right backend: localStorage for user preferences, sessionStorage for transient state, IndexedDB for structured data. Pick the right shelf and quota worries disappear.
deterministicWorkshops
Hand attendees a clean dataset on the fly. Browser feature detection: clipboard, fullscreen, gamepad, and Web Bluetooth APIs gracefully fall back when unavailable. No surprise white screens on Safari or older Firefox.
production-readyFrequently asked questions
Something missing?
Tell us what you need. We ship the top requests every two weeks.