JSON / JSONPath / JMESPath Tester

Why API testers need both JSONPath and JMESPath in one tool

Every REST or GraphQL API test eventually reduces to one question: did the response contain the value we expected, in the shape we expected? JSONPath and JMESPath are the two query languages that answer it — but most online testers only support one. This tool runs both side by side against the same payload so you can pick the right language per assertion, then export the exact code your test framework needs.

What each language is best at

Common API-testing recipes (copy-paste ready)

How to use this tool with Postman, Rest Assured & Playwright

Four short workflows — pick your framework, follow the numbered steps, paste the exported code straight into your test suite.

pm.test("user id is 42", () => {
  const data = pm.response.json();
  pm.expect(jsonpath.query(data, "$.user.id")[0]).to.eql(42);
});

given()
  .when().get("/api/users/42")
  .then().statusCode(200)
  .body("user.id", equalTo(42));

test("GET /users/42", async ({ request }) => {
  const res = await request.get("/api/users/42");
  const body = await res.json();
  expect(body.user.id).toBe(42);
});

# .github/workflows/api.yml
- run: npx newman run collection.json \
    --env-var baseUrl=$STAGING_URL \
    --reporters cli,junit

Tip: the same JSON payload works across all four frameworks — validate once here, export everywhere. For deeper patterns see our Playwright interview prep and API testing Q&A hub.

Why we built this — features competitors don't have

Related resources

• API Testing Interview Questions — the pillar hub for every REST, GraphQL, and contract-testing question you'll face.
• XPath & CSS Selector Generator — same in-browser philosophy, for UI locators.
• Playwright Interview Questions — includes API-testing patterns using Playwright's request fixture.
• Stefan Goessner's original JSONPath spec
• Official JMESPath specification