로그인시 insomnia 의 after-response 스크립트를 다음과 같이 설정

insomnia.test('Check if status is 201', () => {
    insomnia.expect(insomnia.response.code).to.eql(201);
    
        const jsonBody = insomnia.response.json();
      insomnia.environment.set("accessToken", jsonBody.accessToken);
      insomnia.environment.set("refreshToken", jsonBody.refreshToken);
});

postman 

pm.test("Check if status is 201", function () {
    pm.response.to.have.status(201);
    
    const jsonBody = pm.response.json();
    pm.environment.set("accessToken", jsonBody.accessToken);
    pm.environment.set("refreshToken", jsonBody.refreshToken);
});

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https://ilikezzi.tistory.com/76