diff --git a/internal/integrationtest/core/core_test.go b/internal/integrationtest/core/core_test.go
index d18fa1a790e..4e29df954c1 100644
--- a/internal/integrationtest/core/core_test.go
+++ b/internal/integrationtest/core/core_test.go
@@ -48,7 +48,7 @@ func TestCorrectHandlingOfPlatformVersionProperty(t *testing.T) {
 	// Trigger problematic call
 	out, _, err := cli.Run("core", "list", "--format", "json")
 	require.NoError(t, err)
-	requirejson.Contains(t, out, `[{"id":"DxCore-dev:megaavr","installed":"1.4.10","name":"DxCore"}]`)
+	requirejson.Contains(t, out, `[{"id":"DxCore-dev:megaavr","installed_version":"1.4.10","name":"DxCore"}]`)
 }
 
 func TestCoreSearch(t *testing.T) {
@@ -73,8 +73,8 @@ func TestCoreSearch(t *testing.T) {
 	out, _, err = cli.Run("core", "search", "avr", "--format", "json")
 	require.NoError(t, err)
 	requirejson.NotEmpty(t, out)
-	// Verify that "installed" is set
-	requirejson.Contains(t, out, `[{installed: "1.8.6"}]`)
+	// Verify that "installed_version" is set
+	requirejson.Contains(t, out, `[{installed_version: "1.8.6"}]`)
 
 	// additional URL
 	out, _, err = cli.Run("core", "search", "test_core", "--format", "json", "--additional-urls="+url.String())
@@ -84,10 +84,10 @@ func TestCoreSearch(t *testing.T) {
 	// show all versions
 	out, _, err = cli.Run("core", "search", "test_core", "--all", "--format", "json", "--additional-urls="+url.String())
 	require.NoError(t, err)
-	requirejson.Len(t, out, 3)
+	requirejson.Query(t, out, `.[].releases | length`, "3")
 
 	checkPlatformIsInJSONOutput := func(stdout []byte, id, version string) {
-		jqquery := fmt.Sprintf(`[{id:"%s", latest:"%s"}]`, id, version)
+		jqquery := fmt.Sprintf(`[{id:"%s", releases:{"%s":{}}}]`, id, version)
 		requirejson.Contains(t, out, jqquery, "platform %s@%s is missing from the output", id, version)
 	}
 
@@ -171,7 +171,7 @@ func TestCoreSearchNoArgs(t *testing.T) {
 	// same thing in JSON format, also check the number of platforms found is the same
 	stdout, _, err = cli.Run("core", "search", "--format", "json")
 	require.NoError(t, err)
-	requirejson.Contains(t, stdout, `[ { "name":"test_core" } ]`)
+	requirejson.Contains(t, stdout, `[{"id": "test:x86", "releases": { "2.0.0": {"name":"test_core"}}}]`)
 	requirejson.Query(t, stdout, "length", fmt.Sprint(numPlatforms))
 
 	// list all with additional urls, check the test core is there
@@ -188,8 +188,8 @@ func TestCoreSearchNoArgs(t *testing.T) {
 	// same thing in JSON format, also check the number of platforms found is the same
 	stdout, _, err = cli.Run("core", "search", "--format", "json", "--additional-urls="+url.String())
 	require.NoError(t, err)
-	requirejson.Contains(t, stdout, `[ { "name":"test_core" } ]`)
-	requirejson.Query(t, stdout, "length", fmt.Sprint(numPlatforms))
+	requirejson.Contains(t, stdout, `[{"id": "test:x86", "releases": { "3.0.0": {"name":"test_core"}}}]`)
+	requirejson.Query(t, stdout, `[.[].releases | length] | add`, fmt.Sprint(numPlatforms))
 }
 
 func TestCoreUpdateIndexUrlNotFound(t *testing.T) {
@@ -303,7 +303,7 @@ func TestCoreInstall(t *testing.T) {
 	require.NoError(t, err)
 	stdout, _, err := cli.Run("core", "list", "--format", "json")
 	require.NoError(t, err)
-	requirejson.Query(t, stdout, `.[] | select(.id == "arduino:avr") | .installed`, `"1.6.16"`)
+	requirejson.Query(t, stdout, `.[] | select(.id == "arduino:avr") | .installed_version`, `"1.6.16"`)
 
 	// Replace it with the same with --no-overwrite (should NOT fail)
 	_, _, err = cli.Run("core", "install", "arduino:avr@1.6.16", "--no-overwrite")
@@ -318,22 +318,22 @@ func TestCoreInstall(t *testing.T) {
 	require.NoError(t, err)
 	stdout, _, err = cli.Run("core", "list", "--format", "json")
 	require.NoError(t, err)
-	requirejson.Query(t, stdout, `.[] | select(.id == "arduino:avr") | .installed`, `"1.6.17"`)
+	requirejson.Query(t, stdout, `.[] | select(.id == "arduino:avr") | .installed_version`, `"1.6.17"`)
 
 	// Confirm core is listed as "updatable"
 	stdout, _, err = cli.Run("core", "list", "--updatable", "--format", "json")
 	require.NoError(t, err)
 	jsonout := requirejson.Parse(t, stdout)
 	q := jsonout.Query(`.[] | select(.id == "arduino:avr")`)
-	q.Query(".installed").MustEqual(`"1.6.17"`)
-	latest := q.Query(".latest")
+	q.Query(".installed_version").MustEqual(`"1.6.17"`)
+	latest := q.Query(".latest_version")
 
 	// Upgrade the core to latest version
 	_, _, err = cli.Run("core", "upgrade", "arduino:avr")
 	require.NoError(t, err)
 	stdout, _, err = cli.Run("core", "list", "--format", "json")
 	require.NoError(t, err)
-	requirejson.Query(t, stdout, `.[] | select(.id == "arduino:avr") | .installed`, latest.String())
+	requirejson.Query(t, stdout, `.[] | select(.id == "arduino:avr") | .installed_version`, latest.String())
 
 	// double check the core isn't updatable anymore
 	stdout, _, err = cli.Run("core", "list", "--updatable", "--format", "json")
@@ -483,10 +483,14 @@ func TestCoreListAllManuallyInstalledCore(t *testing.T) {
 	requirejson.Contains(t, stdout, `[
 		{
 			"id": "arduino-beta-development:avr",
-			"latest": "1.8.3",
-			"name": "Arduino AVR Boards"
+			"latest_version": "1.8.3",
+			"releases": {
+				"1.8.3": {
+					"name": "Arduino AVR Boards"
+				}
 			}
-		]`)
+		}
+	]`)
 }
 
 func TestCoreListUpdatableAllFlags(t *testing.T) {
@@ -519,10 +523,14 @@ func TestCoreListUpdatableAllFlags(t *testing.T) {
 	requirejson.Contains(t, stdout, `[
 		{
 			"id": "arduino-beta-development:avr",
-			"latest": "1.8.3",
-			"name": "Arduino AVR Boards"
+			"latest_version": "1.8.3",
+			"releases": {
+				"1.8.3": {
+					"name": "Arduino AVR Boards"
+				}
 			}
-		]`)
+		}
+	]`)
 }
 
 func TestCoreUpgradeRemovesUnusedTools(t *testing.T) {
@@ -592,7 +600,11 @@ func TestCoreListWithInstalledJson(t *testing.T) {
 	requirejson.Contains(t, stdout, `[
 		{
 			"id": "adafruit:avr",
-			"name": "Adafruit AVR Boards"
+			"releases": {
+				"1.4.13": {
+					"name": "Adafruit AVR Boards"
+				}
+			}
 		}
 	]`)
 
@@ -614,7 +626,11 @@ func TestCoreListWithInstalledJson(t *testing.T) {
 	requirejson.Contains(t, stdout, `[
 		{
 			"id": "adafruit:avr",
-			"name": "Adafruit Boards"
+			"releases": {
+				"1.4.13": {
+					"name": "Adafruit Boards"
+				}
+			}
 		}
 	]`)
 }
@@ -940,10 +956,10 @@ func TestCoreListOutdatedCore(t *testing.T) {
 	stdout, _, err := cli.Run("core", "list", "--format", "json")
 	require.NoError(t, err)
 	requirejson.Len(t, stdout, 1)
-	requirejson.Query(t, stdout, ".[0] | .installed", "\"1.8.6\"")
-	installedVersion, err := semver.Parse(strings.Trim(requirejson.Parse(t, stdout).Query(".[0] | .installed").String(), "\""))
+	requirejson.Query(t, stdout, ".[0] | .installed_version", "\"1.8.6\"")
+	installedVersion, err := semver.Parse(strings.Trim(requirejson.Parse(t, stdout).Query(".[0] | .installed_version").String(), "\""))
 	require.NoError(t, err)
-	latestVersion, err := semver.Parse(strings.Trim(requirejson.Parse(t, stdout).Query(".[0] | .latest").String(), "\""))
+	latestVersion, err := semver.Parse(strings.Trim(requirejson.Parse(t, stdout).Query(".[0] | .latest_version").String(), "\""))
 	require.NoError(t, err)
 	// Installed version must be older than latest
 	require.True(t, installedVersion.LessThan(latestVersion))