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.
Our verdict
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.
Full review
Mock and Match is a small set of free developer tools that run in the browser. The main one, Mock Data, lets you build a schema of columns, pick how many rows you want (up to 10,000), choose English (US) or Portuguese (Brazil) data, and download the result as JSON, CSV, SQL, JSON Lines, YAML, XML, TypeScript or JavaScript. The second tool, Transform, converts between formats such as JSON to TypeScript, Zod or JSON Schema, YAML, JSON and TOML, and CSS to Tailwind classes. The site also has short written guides.
How the pricing works
The site says the tool is free and needs no sign-up or account. I found no pricing page or paid plan.
What it does
You start from a template (Users, E-commerce, API Response or Financial) or add fields one by one, each with a type from a list of more than 120, such as names,
Mock and Match is a small set of free developer tools that run in the browser. The main one, Mock Data, lets you build a schema of columns, pick how many rows you want (up to 10,000), choose English (US) or Portuguese (Brazil) data, and download the result as JSON, CSV, SQL, JSON Lines, YAML, XML, TypeScript or JavaScript. The second tool, Transform, converts between formats such as JSON to TypeScript, Zod or JSON Schema, YAML, JSON and TOML, and CSS to Tailwind classes. The site also has short written guides.
How the pricing works
The site says the tool is free and needs no sign-up or account. I found no pricing page or paid plan.
What it does
You start from a template (Users, E-commerce, API Response or Financial) or add fields one by one, each with a type from a list of more than 120, such as names, emails, addresses, dates, prices, UUIDs, test cards and Brazilian CPF and CNPJ numbers. Fields can depend on earlier fields through a formula or reference type, and any field can be set to come out blank some of the time. You can also infer a schema from a JSON sample.
Reading the claims
The About page says all content is processed in your browser and never sent to a server. Your last schema is kept in local storage on your device, and Google Analytics loads only if you accept the cookie notice. These are the vendor’s statements and I did not inspect network traffic. The FAQ warns that generated CPF, CNPJ and card numbers are valid in format only and must never be used for real sign-ups or purchases. I opened the pages but did not run a generation.
Who is behind it
The site does not name a company or person. The privacy text refers to Brazil’s LGPD and the current policy is dated September 21, 2026, Brasilia time, which points to a Brazilian maker, but that is my inference and the pages do not say so.
Who it's for
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
Not ideal for
- Teams that need a named vendor
- SLA or support because the maker is not named; people who need more than 10
- 000 rows or 250
- 000 cells in one run; anyone who wants a hosted mock API rather than file downloads
How we tested
Ashley Richmond desk research, October 3, 2026: the Product Hunt page and mockandmatch.dev, including the home page, Mock Data, Transform, Guides and About and Privacy pages. I did not run a generation or inspect network traffic. The logo is the site icon and the screenshots are the official pages.
What's new
No changelog found. The privacy policy is dated September 21, 2026.
At a glance
| Pricing | Free plan |
|---|---|
| Free plan | Yes |
| Free trial | No |
| Pricing page | View pricing |
| Platforms | Web app |
| API | No |
| Company | Not stated (maker not named) |
| Apps Insight Score | 35/100 |
Why this app scored 35/100
Editorial Review 20/30
- Product quality 7/10 7/10
- Ease of use 4/5 4/5
- Feature depth 3/5 3/5
- Innovation 3/5 3/5
- Value for money 2/3 2/3
- Recommendation confidence 1/2 1/2
Trust & Verification 3/25
- AppsInsight badge installed Badge not installed 0/15
- HTTPS website HTTPS 1/1
- Business support email Missing 0/1
- Privacy policy published Provided 2/2
- Terms of service published Missing 0/1
- Security certifications None listed 0/2
- Knowledge base / help center Missing 0/2
- Social profiles linked 0 profiles linked 0/1
Community 0/20
- Verified reviews & rating 0 reviews (5 needed) 0/15
- Recent reviews No reviews yet 0/5
Product Profile 9/20
- Detailed description 333 words 2/3
- Screenshots 2 screenshots 1/3
- Demo video No demo video 0/2
- FAQ 6 items 1/2
- Feature list 8 items 1/2
- Pricing published Plan tiers published 3/3
- Pros & cons Pros & cons listed 1/1
- Integrations 0 integrations 0/2
- API available No 0/1
- Company details 1 of 3 details filled 0/1
Freshness 3/5
- Listing recently updated Updated 0 days ago 3/3
- Recent changelog entry No changelog entries 0/2
Editorial points are assigned by AppsInsight editors and cannot be purchased or influenced.
Built for
Use case
Development & DevOps
Industry
SaaS & technology
How Mock and Match compares
| Feature | Mock and Match | iFixAi |
|---|---|---|
| Rating | 3.5 / 5 | 3.8 / 5 |
| Pricing | Free plan | Free+Paid |
| Starting price | Free | — |
| Free plan | Included | Included |
| Free trial | No | No |
| Platforms | Web app | — |
| 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 | Teams deploying AI agents with real authority over money, data or customers, engineering leads who need audit evidence they can defend, and enterprises that want agent governance without building an eval harness. |
Key features
Schema builder
Add columns from more than 120 field types such as names, emails, UUIDs, dates and test cards.
Templates
Start from Users, E-commerce, API Response or Financial templates.
Many export formats
Download JSON, CSV, SQL, JSON Lines, YAML, XML, TypeScript or JavaScript.
Up to 10,000 rows
Generate up to 10,000 rows, capped at 250,000 cells per run.
English or Portuguese data
Pick Portuguese (Brazil) or English (US) data, including CPF and CNPJ.
Dependent fields
Use formula or reference fields that build on earlier columns, and set a blank probability.
Transform
Convert JSON to TypeScript, Zod or JSON Schema, and YAML, JSON and TOML.
Infer from JSON
Paste a JSON sample and let the tool suggest a type for each field.
Key benefits
- No real customer data: fixtures are random and fictional.
- Runs in the browser: the site says nothing you build leaves your machine.
- Ready-to-use output: SQL inserts, typed fixtures and CSV that opens in Excel.
- Fast start: templates and an infer-from-JSON option.
Pricing
Free plan
Free ($0)
- Mock Data generator;Transform converter;No account;Local processing
Pros & Cons
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.
Screenshots & media
Mock and Match alternatives
View all alternatives
More Testing & QA apps
User reviews
No reviews yet. Be the first to review this app.
Write a review
Already have an account? Log in to track your reviews.
Frequently asked questions
Is Mock and Match free?
Yes. The FAQ says the tool is free and needs no sign-up or account. I found no paid plan.
Is my data sent to a server?
The site says no. Generation and conversion happen in your browser, and the last schema is saved only in your device's local storage. Google Analytics loads only if you accept the cookie notice and never receives what you type. These are vendor statements that I did not verify.
Is the generated data real?
No. Names, emails, addresses, CPF, CNPJ and cards are random. CPF and CNPJ have valid check digits and cards pass the Luhn check so they work in forms, but the site says never to use them in real sign-ups or purchases.
What are the limits?
Up to 10,000 rows at a time, and no more than 250,000 cells (rows times fields) per run.
Which export formats are there?
JSON, CSV, SQL, JSON Lines, YAML, XML, TypeScript and JavaScript for Mock Data. Transform also converts to Zod, JSON Schema and TOML.
Who makes it?
The site does not name a company or person. The privacy text refers to Brazil's LGPD, which suggests a Brazilian maker, but the pages do not say so.