Mock JSON Generator
Generates any number of realistic mock records from a JSON template with placeholders like {{name}}, {{email}}, {{int 1 100}} or {{pick red|green|blue}} — for seeding tests, demos and API mocks.
Runs 100% in your browser — nothing you paste leaves your device.
Read the full guide to this tool
Notes
- Placeholders that produce numbers or booleans ({{int}}, {{float}}, {{bool}}) become real JSON numbers and booleans when they are the only content of a string.
- For flat CSV-style datasets, the Test Data Generator in Data & Files does the same with column pickers.
- Runs 100% in your browser — nothing you paste leaves your device.
Related tools
JSON Formatter & Validator
Format, validate, minify and query JSON with JSONPath.
JSON Schema Validator
Validate JSON data against a JSON Schema.
JSON ↔ YAML ↔ TOML ↔ XML ↔ CSV
Convert between the five common data formats.
Regex Tester
Test regular expressions live, with a plain-English explanation.
SQL Formatter
Pretty-print and minify SQL for any major dialect.
.gitignore Generator
Build a .gitignore from language, IDE, and OS templates with deduplication, stack presets, and share links.