What is Mock and Match?
Fake test data & JSON tools, 100% in your browser Mock and Match is a small set of free developer tools that run in the browser.
Why we recommend it
Two focused developer tools in one place: a schema-based fake data generator with many export formats, and a format converter, both said to run entirely in your browser with no account. The FAQ is straight about what the fake cards and Brazilian IDs are for. The maker is not named and I did not run a generation, so the local-processing claim is the vendor's own. Desk-research score 3.5/5.
Best for
- Developers who need realistic fixtures or seed data fast; front-end developers mocking an API response; teams working with Brazilian formats such as CPF and CNPJ; anyone who prefers tools that do not upload their data
Key features
Add columns from more than 120 field types such as names, emails, UUIDs, dates and test cards.
Start from Users, E-commerce, API Response or Financial templates.
Download JSON, CSV, SQL, JSON Lines, YAML, XML, TypeScript or JavaScript.
Generate up to 10,000 rows, capped at 250,000 cells per run.
Pick Portuguese (Brazil) or English (US) data, including CPF and CNPJ.
Pros
- Free to use: no price or sign-up found.
- Wide export list: eight output formats.
- Clear warnings: the FAQ says test IDs and cards must never be used for real.
- Brazil-ready: CPF and CNPJ with valid check digits.
Cons
- Maker not named: no company or contact found.
- Limits per run: 10,000 rows and 250,000 cells.
- Random output: results change each click unless you use fixed types.
- Not tested: I did not run a generation or check network traffic.