JSON validation and field detection
Paste a JSON payload and automatically detect editable fields including strings, numbers, booleans, dates, emails, UUIDs, and null values.
Windows API testing tool for developers and QA
Forge better API test cases from JSON payloads.
Payload Forge helps you validate JSON, detect fields, configure payload values, add custom headers and authorization, create reusable expected cases, and run API tests from one focused Windows desktop app.
One-time download. Built for REST APIs, JSON payload testing, and fast validation workflows.
Everything you need for focused API payload testing.
Payload Forge is built around the repetitive testing developers actually do: changing JSON values, checking expected status codes, and confirming response text.
Configurable payload generation
Set field behavior such as fixed values, generated emails, random names, random numbers, current dates, UUIDs, one-of values, and nulls.
Reusable expected cases
Create named cases with expected HTTP status codes and expected response text so validation scenarios can be repeated quickly.
Per-case field overrides
Override a specific field for each case. Test blank values, null values, invalid types, edge cases, and custom inputs without rebuilding your payload.
Headers and authorization
Add custom headers and configure authorization for APIs that require bearer tokens, JWTs, API keys, basic auth, or custom auth headers.
Save and load projects
Save the URL, method, JSON, field settings, expected cases, overrides, headers, and authorization settings into a reusable project file.
A faster workflow for API validation.
Stop recreating the same negative test cases by hand. Build once, run repeatedly, and save the project for later.
Paste JSON
Start with the request payload your endpoint expects.
Detect fields
Payload Forge extracts editable paths from the payload.
Add cases
Create scenarios like missing username, invalid email, or null password.
Run tests
Send requests, check expected results, and review responses.
Buy once. Use it on your Windows machine.
DeepFrame API Inspector is a lightweight Windows desktop application that runs completely on your machine. Unlike cloud API testing platforms, your endpoints, credentials, payloads, and customer data never leave your computer.
- Windows desktop application
- JSON payload field detection
- Reusable test case projects
- Custom headers and authorization
- Useful for backend development and QA workflows
Frequently asked questions
Simple answers for developers and QA users evaluating DeepFrame API Inspector.
Is DeepFrame API Inspector a replacement for Postman?
No. DeepFrame API Inspector is more focused. It is designed for quickly generating payload variations, expected cases, overrides, and repeatable JSON API tests.
Does it support authenticated APIs?
Yes. You can add custom headers and configure authorization values for APIs that require bearer tokens, JWTs, API keys, basic auth, or custom headers.
Can I save my work?
Yes. Projects can store your URL, HTTP method, JSON payload, field settings, expected cases, overrides, headers, and authorization settings.
Who is this for?
DeepFrame API Inspector is built for backend developers, QA testers, indie developers, and anyone validating REST APIs with JSON request bodies.
Why is local API testing more secure?
Many developers work with internal APIs, staging environments, production credentials, and sensitive customer data. Because DeepFrame API Inspector runs locally, your information stays under your control instead of being routed through third-party cloud infrastructure.