diff --git a/redfish/dmtf_tools/test_redfishtool_certificate.robot b/redfish/dmtf_tools/test_redfishtool_certificate.robot
index 5c84b62..63d0280 100644
--- a/redfish/dmtf_tools/test_redfishtool_certificate.robot
+++ b/redfish/dmtf_tools/test_redfishtool_certificate.robot
@@ -6,6 +6,7 @@
 Library           OperatingSystem
 Library           String
 Library           Collections
+Library           JSONLibrary
 
 Resource          ../../lib/resource.robot
 Resource          ../../lib/bmc_redfish_resource.robot
@@ -284,8 +285,8 @@
     [Documentation]  Delete all CA certificate via Redfish.
 
     ${cmd_output}=  Redfishtool Get  /redfish/v1/Managers/bmc/Truststore/Certificates
-    ${json_object}=  To JSON  ${cmd_output}
-    ${cert_list}=  Set Variable  ${json_object["Members"]}
+    ${cmd_output}=  Convert String to JSON  ${cmd_output}
+    ${cert_list}=  Set Variable  ${cmd_output["Members"]}
     FOR  ${cert}  IN  @{cert_list}
       Redfishtool Delete  ${cert["@odata.id"]}  ${root_cmd_args}
     END
@@ -333,14 +334,13 @@
     ...  X-Auth-Token=${XAUTH_TOKEN}
     Set To Dictionary  ${kwargs}  headers  ${headers}
 
-    ${ret}=  Post Request  openbmc  ${uri}  &{kwargs}
-    ${content_json}=  To JSON  ${ret.content}
-    ${cert_id}=  Set Variable If  '${ret.status_code}' == '${HTTP_OK}'  ${content_json["Id"]}  -1
+    ${resp}=  POST On Session  openbmc  ${uri}  &{kwargs}
+    ${cert_id}=  Set Variable If  '${resp.status_code}' == '${HTTP_OK}'  ${resp.json()["Id"]}  -1
 
     Run Keyword If  '${status}' == 'ok'
-    ...  Should Be Equal As Strings  ${ret.status_code}  ${HTTP_OK}
+    ...  Should Be Equal As Strings  ${resp.status_code}  ${HTTP_OK}
     ...  ELSE IF  '${status}' == 'error'
-    ...  Should Be Equal As Strings  ${ret.status_code}  ${HTTP_INTERNAL_SERVER_ERROR}
+    ...  Should Be Equal As Strings  ${resp.status_code}  ${HTTP_INTERNAL_SERVER_ERROR}
 
     Delete All Sessions
 
@@ -409,9 +409,10 @@
 
     ${rc}  ${cmd_output}=  Run and Return RC and Output  ${cmd_args} GET ${uri}
     Run Keyword If  ${rc} != 0  Is HTTP error Expected  ${cmd_output}  ${expected_error}
-    ${json_object}=  To JSON  ${cmd_output}
 
-    [Return]  ${json_object["CertificateString"]}
+    ${cmd_output}=  Convert String to JSON  ${cmd_output}
+
+    [Return]  ${cmd_output["CertificateString"]}
 
 
 Suite Setup Execution
diff --git a/redfish/dmtf_tools/test_redfishtool_local_user.robot b/redfish/dmtf_tools/test_redfishtool_local_user.robot
index a27d339..5b0ca54 100644
--- a/redfish/dmtf_tools/test_redfishtool_local_user.robot
+++ b/redfish/dmtf_tools/test_redfishtool_local_user.robot
@@ -249,24 +249,6 @@
     [return]  ${status}
 
 
-Redfishtool GetAttribute
-    [Documentation]  Execute redfishtool for GET operation.
-    [Arguments]  ${uri}  ${Attribute}  ${cmd_args}=${root_cmd_args}  ${expected_error}=""
-
-    # Description of argument(s):
-    # uri             URI for GET operation (e.g. /redfish/v1/AccountService/Accounts/).
-    # Attribute       The specific attribute to be retrieved with the URI.
-    # cmd_args        Commandline arguments.
-    # expected_error  Expected error optionally provided in testcase (e.g. 401 /
-    #                 authentication error, etc. ).
-
-    ${rc}  ${cmd_output}=  Run and Return RC and Output  ${cmd_args} GET ${uri}
-    Run Keyword If  ${rc} != 0  Is HTTP error Expected  ${cmd_output}  ${expected_error}
-    ${json_object}=  To JSON  ${cmd_output}
-
-    [Return]  ${json_object["${Attribute}"]}
-
-
 Suite Setup Execution
     [Documentation]  Do suite setup execution.
 
diff --git a/redfish/service_root/test_service_root.robot b/redfish/service_root/test_service_root.robot
index 5c378c5..f5c03ce 100644
--- a/redfish/service_root/test_service_root.robot
+++ b/redfish/service_root/test_service_root.robot
@@ -64,8 +64,9 @@
     ${headers}=  Create Dictionary  Content-Type=application/json
     ...  X-Auth-Token=deadbeef
 
-    ${resp}=  Get Request
+    ${resp}=  GET On Session
     ...  openbmc  /redfish/v1/SessionService/Sessions  headers=${headers}
+    ...  expected_status=${HTTP_UNAUTHORIZED}
 
     Should Be Equal As Strings  ${resp.status_code}  ${HTTP_UNAUTHORIZED}
 
@@ -106,15 +107,14 @@
 
     Create Session  openbmc  https://${OPENBMC_HOST}
     ${headers}=  Create Dictionary  Content-Type=application/json
-    ${data}=  Create Dictionary  UserName=${OPENBMC_USERNAME}  Password=${OPENBMC_PASSWORD}
+    ${data}=  Set Variable  {"UserName":"${OPENBMC_USERNAME}", "Password":"${OPENBMC_PASSWORD}"}
 
-    ${resp}=  Post Request  openbmc  /redfish/v1/SessionService/Sessions  data=${data}  headers=${headers}
+    ${resp}=  POST On Session  openbmc  /redfish/v1/SessionService/Sessions  data=${data}  headers=${headers}
     Should Be Equal As Strings  ${resp.status_code}  ${HTTP_CREATED}
 
-    ${content}=  To JSON  ${resp.content}
     ${headers}=  Create Dictionary   Content-Type=application/json
     ...  X-Auth-Token=${resp.headers["X-Auth-Token"]}
-    ${resp}=  Delete Request  openbmc  ${REDFISH_SESSION}${/}${content["Id"]}  headers=${headers}
+    ${resp}=  DELETE On Session  openbmc  ${REDFISH_SESSION}${/}${resp.json()["Id"]}  headers=${headers}
     Should Be Equal As Strings  ${resp.status_code}  ${HTTP_OK}
 
 
diff --git a/redfish/service_root/test_service_root_security.robot b/redfish/service_root/test_service_root_security.robot
index c0a8d89..0686d6f 100644
--- a/redfish/service_root/test_service_root_security.robot
+++ b/redfish/service_root/test_service_root_security.robot
@@ -46,7 +46,7 @@
     ${headers}=  Create Dictionary  Content-Type=application/json
 
     Run Keyword And Expect Error  *Connection refused*
-    ...  Post Request  openbmc  /redfish/v1/SessionService/Sessions
+    ...  POST On Session  openbmc  /redfish/v1/SessionService/Sessions
     ...  data=${data}  headers=${headers}
 
 
@@ -61,7 +61,7 @@
     ${headers}=  Create Dictionary  Content-Type=application/json
 
     Run Keyword And Expect Error  *Connection refused*
-    ...  Post Request  openbmc  /redfish/v1/SessionService/Sessions
+    ...  POST On Session  openbmc  /redfish/v1/SessionService/Sessions
     ...  data=${data}  headers=${headers}
 
 
diff --git a/redfish/systems/eventlog/test_association.robot b/redfish/systems/eventlog/test_association.robot
index 3dc8d79..093aff0 100755
--- a/redfish/systems/eventlog/test_association.robot
+++ b/redfish/systems/eventlog/test_association.robot
@@ -45,10 +45,9 @@
     Create Test Error With Callout
     ${elog_entry}=  Get Elog URL List
     ${resp}=  OpenBMC Get Request  ${elog_entry[0]}
-    ${jsondata}=  To JSON  ${resp.content}
     List Should Contain Value
-    ...  ${jsondata["data"]["AdditionalData"]}  CALLOUT_DEVICE_PATH_TEST=${target_device_path}
-    List Should Contain Value  ${jsondata["data"]["AdditionalData"]}  DEV_ADDR=0x0DEADEAD
+    ...  ${resp.json()["data"]["AdditionalData"]}  CALLOUT_DEVICE_PATH_TEST=${target_device_path}
+    List Should Contain Value  ${resp.json()["data"]["AdditionalData"]}  DEV_ADDR=0x0DEADEAD
 
 
 Create Test Error Callout And Verify Associations
@@ -67,11 +66,10 @@
     Create Test Error With Callout
     ${elog_entry}=  Get Elog URL List
     ${resp}=  OpenBMC Get Request  ${elog_entry[0]}
-    ${jsondata}=  To JSON  ${resp.content}
-    List Should Contain Value  ${jsondata["data"]["Associations"][0]}  callout
-    List Should Contain Value  ${jsondata["data"]["Associations"][0]}  fault
+    List Should Contain Value  ${resp.json()["data"]["Associations"][0]}  callout
+    List Should Contain Value  ${resp.json()["data"]["Associations"][0]}  fault
     List Should Contain Value
-    ...  ${jsondata["data"]["Associations"][0]}
+    ...  ${resp.json()["data"]["Associations"][0]}
     ...  /xyz/openbmc_project/inventory/system/chassis/motherboard/cpu0
 
 
@@ -200,8 +198,7 @@
     Create Test Error With Callout
     ${elog_entry}=  Get URL List  ${BMC_LOGGING_ENTRY}
     ${resp}=  OpenBMC Get Request  ${elog_entry[0]}
-    ${jsondata}=  To JSON  ${resp.content}
-    Should Contain  ${jsondata["data"]["Associations"][0]}  callout
+    Should Contain  ${resp.json()["data"]["Associations"][0]}  callout
 
     # Set the error log field "Resolved".
     # By doing so, the callout object should get deleted automatically.
@@ -260,12 +257,11 @@
     [Documentation]  Verify test error log entries.
     ${elog_entry}=  Get Elog URL List
     ${resp}=  OpenBMC Get Request  ${elog_entry[0]}
-    ${json}=  To JSON  ${resp.content}
 
-    Should Be Equal  ${json["data"]["Message"]}
+    Should Be Equal  ${resp.json()["data"]["Message"]}
     ...  example.xyz.openbmc_project.Example.Elog.TestCallout
 
-    Should Be Equal  ${json["data"]["Severity"]}
+    Should Be Equal  ${resp.json()["data"]["Severity"]}
     ...  xyz.openbmc_project.Logging.Entry.Level.Error
 
     ${content}=  Read Attribute  ${elog_entry[0]}/callout  endpoints
diff --git a/redfish/systems/eventlog/test_esel.robot b/redfish/systems/eventlog/test_esel.robot
index 4a2c85e..7381f6e 100644
--- a/redfish/systems/eventlog/test_esel.robot
+++ b/redfish/systems/eventlog/test_esel.robot
@@ -104,7 +104,6 @@
     ${elog_entry}=  Get URL List  ${BMC_LOGGING_ENTRY}
     ${resp}=  OpenBMC Get Request  ${elog_entry[0]}
     Should Be Equal As Strings  ${resp.status_code}  ${HTTP_OK}
-    ${jsondata}=  To JSON  ${resp.content}
     # "/xyz/openbmc_project/logging/entry/1": {
     #    "Timestamp": 1487743771812,
     #    "AdditionalData": [],
@@ -112,7 +111,7 @@
     #    "Id": 1,
     #    "Severity": "xyz.openbmc_project.Logging.Entry.Level.Emergency"
     # }
-    Should Not Be Empty  ${jsondata["data"]["AdditionalData"]}
+    Should Not Be Empty  ${resp.json()["data"]["AdditionalData"]}
 
 
 Test Wrong Reservation_ID