Generate realistic fake JSON data for software testing, API mocking, and AI training datasets. Names, emails, UUIDs, dates, and custom templates.
Record count
Max 500 (free)
Seed
Privacy: Conversion runs locally in your browser. Your source file is not uploaded to JAD Apps servers.
Generate realistic fake JSON records for software testing, API mocking, and AI training datasets. Built-in templates produce names, emails, UUIDs, addresses, and dates with a seedable PRNG so test data is reproducible.
Free is enough for most one-off jobs. Pro raises the file and batch caps; Pro + Media unlocks GB-scale streaming and unlimited duration.
Larger files supported on Developer (5 GB CSV) and Enterprise (unlimited). All processing happens in your browser — files never reach a server.
Pick a record count
Free generates up to 500 records, Pro up to 100,000. The seeded PRNG keeps the output reproducible.
(Optional) set a seed
Set a numeric seed to lock in a specific output. The same seed always produces the same data.
Download the JSON
Records include id, name, email, phone, age, status, address (street/city/zip), score, createdAt, and active flags.
No — it's deterministic given a seed. Same seed + same count = identical output. This is intentional so tests don't flake.
The current templates are fixed. For schema-driven generation, pair the JSON Schema Generator output with a tool like Faker or Mockaroo.
100,000 records on Pro. Beyond that, generate in batches and concatenate with JSON Object Merger.
Privacy
Conversion runs locally in your browser. Your source file is not uploaded to JAD Apps servers.
Replace sensitive PII values in JSON with realistic fake data for GDPR compliance, safe sharing, and QA. Configurable key-to-strategy mapping. No upload.
Automatically generate a valid JSON Schema (Draft 7) from any JSON data sample. Infers types, required fields, and nested object shapes. No upload.
Automatically fix common broken JSON: missing quotes on keys, trailing commas, single quotes, and unescaped characters. Browser-based, no upload.