Question 1

What does the API Test Case Documentation Generator do?

Accepted Answer

You describe an endpoint — its HTTP method, path and the parameters/body fields it accepts (name, type, whether each is required, and where it lives: path, query or body). From that description the tool derives a complete, structured test-case matrix: a happy path, one case per missing required field, one per invalid type, unauthorized and forbidden cases, a not-found case for id-bearing paths, a rate-limit case and method-specific scenarios like idempotency for PUT/PATCH or conflict for POST. Each case has a stable ID, a category, a precondition, a request summary and an expected status with a note. You can read it as a grouped table or export the whole plan as Markdown or Gherkin.

Question 2

Which test categories does it cover and why?

Accepted Answer

Five: Happy (the request works for valid, authorized input), Validation (malformed input is rejected — missing required fields → 422, wrong types → 400, duplicate creates → 409), Auth (401 for missing/invalid credentials, 403 for authenticated-but-not-permitted), NotFound (404 for a valid-but-unknown id, only generated for paths containing a {param}), and RateLimit (429 when a client bursts past its quota). These map directly to the status-code contract most reviewers and CI gates check, so the matrix mirrors the boundaries an endpoint actually has rather than a generic checklist.

Question 3

Why does it generate a case per field instead of one big test?

Accepted Answer

Because validation bugs hide at the boundary of a single field. A test that omits every required field at once tells you the endpoint rejects empty input, but not which field's validation is missing. Generating one missing-required case and one invalid-type case per field makes each failure independently diagnosable: when TC-004 (invalid type for amount) regresses, you know exactly what broke. This is the variable-isolation principle behind equivalence-class and boundary testing, applied automatically.

Question 4

What is the Gherkin/BDD export and when should I use it?

Accepted Answer

Gherkin is the Given/When/Then language used by Cucumber, Behave, SpecFlow and similar BDD frameworks. The export turns each generated case into a Scenario under a Feature for the endpoint, with the precondition as Given, the request as When, and the expected status and response note as Then/And. Use it when your team drives tests from feature files or wants living documentation that non-engineers can read; use the Markdown export when you want a test plan for a PR, a wiki or a review.

Question 5

Is anything sent to a server?

Accepted Answer

No. The endpoint description never leaves your browser — the matrix, the Markdown and the Gherkin are all generated in JavaScript on your machine. There's no account, no upload and no telemetry, so it's safe to document internal or unreleased endpoints, and it works offline once the page has loaded. The tool does not call your API; it produces the test design, which you then run with your own client or framework.

Question 6

How do the status codes get chosen?

Accepted Answer

By convention and the method: success is 201 for POST (created), 204 for DELETE (no content) and 200 otherwise; a missing required field yields 422 (semantically invalid), a wrong type yields 400 (malformed), a duplicate create yields 409, missing/invalid auth yields 401, an authenticated-but-forbidden principal yields 403, an unknown id yields 404, and exceeding the quota yields 429. These are sensible defaults that match the most common REST conventions — adjust them in your own suite if your API uses, say, 400 instead of 422 for validation.

Question 7

Can I edit the field list?

Accepted Answer

Yes — the field editor lets you add and remove rows and set each field's name, type (string/number/boolean), required flag and location (path/query/body). The matrix regenerates instantly as you edit, so you can watch cases appear and disappear: marking a field required adds a missing-required case, every field gets an invalid-type case, and adding a {param} to the path switches on the not-found case.

Question 8

How does this fit into a CI pipeline?

Accepted Answer

Treat the output as the test design, then implement it. Export the Markdown plan into your repo as the spec a reviewer signs off on, or export the Gherkin and wire the scenarios to step definitions that hit a staging endpoint — the expected statuses become your assertions. Because the IDs are stable (TC-001…), you can trace a CI failure straight back to the documented case. The generator keeps the design and the documentation in lockstep so the plan doesn't drift from the suite.

Question 9

Does it handle path, query and body parameters differently?

Accepted Answer

Yes. The location matters for how a request is built and which failures are possible: body and query fields appear in the request summary as a JSON body or a query string, path fields are interpolated into the URL, and a {param} in the path is what triggers the not-found case (you can't 404 on an id you never accept). Required and type checks apply to all three, so a required query parameter still gets a missing-required and an invalid-type case.

Question 10

Why test 401 and 403 separately — aren't they the same?

Accepted Answer

No, and conflating them is a classic security and contract bug. 401 (Unauthorized) means the request lacks valid credentials — the server doesn't know who you are. 403 (Forbidden) means it knows who you are but you're not allowed to do this. Testing both ensures the endpoint authenticates before it authorizes, returns the right code for each, and — importantly for not-found cases — doesn't leak resource existence to a forbidden caller. The matrix generates both so the distinction is always documented and verified.

ID	Title	Precondition / Request	Status	Expected response
TC-001	Happy path — valid request	Authenticated; all required fields present and well-typed. POST /api/orders · valid bearer token · body { customerId: "sample", items: "sample", couponCode: "sample" }	201	Returns the created resource with a generated id.
TC-002	Happy path — only required fields	Authenticated; optional fields omitted. POST /api/orders · valid bearer token · body { customerId: "sample", items: "sample" }	201	Optional field (couponCode) may be omitted without error.

ID	Title	Precondition / Request	Status	Expected response
TC-003	Missing required field — customerId	Authenticated; omit the required body field "customerId". POST /api/orders · valid bearer token · body { items: "sample", couponCode: "sample" }	422	Validation error pointing at "customerId"; no resource created or mutated.
TC-004	Missing required field — items	Authenticated; omit the required body field "items". POST /api/orders · valid bearer token · body { customerId: "sample", couponCode: "sample" }	422	Validation error pointing at "items"; no resource created or mutated.
TC-005	Invalid type — customerId (string)	Authenticated; send "customerId" with a value that violates its string type. POST /api/orders · valid bearer token · body { customerId: 12345, items: "sample", couponCode: "sample" }	400	Type coercion fails for "customerId"; error names the offending field.
TC-006	Invalid type — items (string)	Authenticated; send "items" with a value that violates its string type. POST /api/orders · valid bearer token · body { customerId: "sample", items: 12345, couponCode: "sample" }	400	Type coercion fails for "items"; error names the offending field.
TC-007	Invalid type — couponCode (string)	Authenticated; send "couponCode" with a value that violates its string type. POST /api/orders · valid bearer token · body { customerId: "sample", items: "sample", couponCode: 12345 }	400	Type coercion fails for "couponCode"; error names the offending field.
TC-011	Conflict — duplicate create	Authenticated; create a resource whose unique key already exists. POST /api/orders · valid bearer token · body { customerId: "sample", items: "sample", couponCode: "sample" } · duplicate of an existing resource	409	Server rejects the duplicate; existing resource is untouched.

ID	Title	Precondition / Request	Status	Expected response
TC-008	Unauthorized — missing/invalid token	No Authorization header (or an expired/garbage bearer token). POST /api/orders · no Authorization header · body { customerId: "sample", items: "sample", couponCode: "sample" }	401	Request rejected before business logic runs; WWW-Authenticate challenge returned.
TC-009	Forbidden — authenticated but not permitted	Valid token for a principal lacking the required scope/role. POST /api/orders · valid bearer token · body { customerId: "sample", items: "sample", couponCode: "sample" }	403	Identity is known but authorization fails; no data leaked in the body.

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