diff --git a/Documentation/SwiftlyDocs.docc/swiftly-cli-reference.md b/Documentation/SwiftlyDocs.docc/swiftly-cli-reference.md
index 8896f5d1..76945d5a 100644
--- a/Documentation/SwiftlyDocs.docc/swiftly-cli-reference.md
+++ b/Documentation/SwiftlyDocs.docc/swiftly-cli-reference.md
@@ -23,7 +23,7 @@ swiftly [--version] [--help]
 Install a new toolchain.
 
 ```
-swiftly install [<version>] [--use] [--verify|no-verify] [--post-install-file=<post-install-file>] [--progress-file=<progress-file>] [--assume-yes] [--verbose] [--version] [--help]
+swiftly install [<version>] [--use] [--verify|no-verify] [--post-install-file=<post-install-file>] [--progress-file=<progress-file>] [--format=<format>] [--assume-yes] [--verbose] [--version] [--help]
 ```
 
 **version:**
@@ -89,6 +89,11 @@ Each progress entry contains timestamp, progress percentage, and a descriptive m
 The file must be writable, else an error will be thrown.
 
 
+**--format=\<format\>:**
+
+*Output format (text, json)*
+
+
 **--assume-yes:**
 
 *Disable confirmation prompts by assuming 'yes'*
diff --git a/Sources/Swiftly/Install.swift b/Sources/Swiftly/Install.swift
index 516fd970..11999f9a 100644
--- a/Sources/Swiftly/Install.swift
+++ b/Sources/Swiftly/Install.swift
@@ -81,14 +81,17 @@ struct Install: SwiftlyCommand {
         ))
     var progressFile: FilePath?
 
+    @Option(name: .long, help: "Output format (text, json)")
+    var format: SwiftlyCore.OutputFormat = .text
+
     @OptionGroup var root: GlobalOptions
 
     private enum CodingKeys: String, CodingKey {
-        case version, use, verify, postInstallFile, root, progressFile
+        case version, use, verify, postInstallFile, root, progressFile, format
     }
 
     mutating func run() async throws {
-        try await self.run(Swiftly.createDefaultContext())
+        try await self.run(Swiftly.createDefaultContext(format: self.format))
     }
 
     private func swiftlyHomeDir(_ ctx: SwiftlyCoreContext) -> FilePath {
@@ -266,7 +269,10 @@ struct Install: SwiftlyCommand {
         progressFile: FilePath? = nil
     ) async throws -> (postInstall: String?, pathChanged: Bool) {
         guard !config.installedToolchains.contains(version) else {
-            await ctx.message("\(version) is already installed.")
+            let installInfo = InstallInfo(
+                version: version, alreadyInstalled: true
+            )
+            try await ctx.output(installInfo)
             return (nil, false)
         }
 
@@ -312,16 +318,18 @@ struct Install: SwiftlyCommand {
                 }
             }
 
-            let animation: ProgressReporterProtocol =
+            let animation: ProgressReporterProtocol? =
                 if let progressFile
             {
                 try JsonFileProgressReporter(ctx, filePath: progressFile)
+            } else if ctx.format == .json {
+                ConsoleProgressReporter(stream: stderrStream, header: "Downloading \(version)")
             } else {
                 ConsoleProgressReporter(stream: stdoutStream, header: "Downloading \(version)")
             }
 
             defer {
-                try? animation.close()
+                try? animation?.close()
             }
 
             var lastUpdate = Date()
@@ -351,7 +359,7 @@ struct Install: SwiftlyCommand {
                         lastUpdate = Date()
 
                         do {
-                            try await animation.update(
+                            try await animation?.update(
                                 step: progress.receivedBytes,
                                 total: progress.totalBytes!,
                                 text:
@@ -368,10 +376,10 @@ struct Install: SwiftlyCommand {
                 throw SwiftlyError(
                     message: "\(version) does not exist at URL \(notFound.url), exiting")
             } catch {
-                try? await animation.complete(success: false)
+                try? await animation?.complete(success: false)
                 throw error
             }
-            try await animation.complete(success: true)
+            try await animation?.complete(success: true)
 
             if verifySignature {
                 try await Swiftly.currentPlatform.verifyToolchainSignature(
@@ -427,7 +435,11 @@ struct Install: SwiftlyCommand {
                 return (pathChanged, config)
             }
             config = newConfig
-            await ctx.message("\(version) installed successfully!")
+            let installInfo = InstallInfo(
+                version: version,
+                alreadyInstalled: false
+            )
+            try await ctx.output(installInfo)
             return (postInstallScript, pathChanged)
         }
     }
diff --git a/Sources/Swiftly/OutputSchema.swift b/Sources/Swiftly/OutputSchema.swift
index 3664914a..6c971ed2 100644
--- a/Sources/Swiftly/OutputSchema.swift
+++ b/Sources/Swiftly/OutputSchema.swift
@@ -339,3 +339,28 @@ struct InstalledToolchainsListInfo: OutputData {
         return lines.joined(separator: "\n")
     }
 }
+
+struct InstallInfo: OutputData {
+    let version: ToolchainVersion
+    let alreadyInstalled: Bool
+
+    init(version: ToolchainVersion, alreadyInstalled: Bool) {
+        self.version = version
+        self.alreadyInstalled = alreadyInstalled
+    }
+
+    var description: String {
+        "\(self.version) is \(self.alreadyInstalled ? "already installed" : "installed successfully!")"
+    }
+
+    private enum CodingKeys: String, CodingKey {
+        case version
+        case alreadyInstalled
+    }
+
+    public func encode(to encoder: Encoder) throws {
+        var container = encoder.container(keyedBy: CodingKeys.self)
+        try container.encode(self.version.name, forKey: .version)
+        try container.encode(self.alreadyInstalled, forKey: .alreadyInstalled)
+    }
+}
diff --git a/Tests/SwiftlyTests/InstallTests.swift b/Tests/SwiftlyTests/InstallTests.swift
index 590d9b0a..4fd6d914 100644
--- a/Tests/SwiftlyTests/InstallTests.swift
+++ b/Tests/SwiftlyTests/InstallTests.swift
@@ -389,4 +389,38 @@ import Testing
         }
     }
 #endif
+
+    /// Tests that `install` command with JSON format outputs correctly structured JSON.
+    @Test(.testHomeMockedToolchain()) func installJsonFormat() async throws {
+        let output = try await SwiftlyTests.runWithMockedIO(
+            Install.self, ["install", "5.7.0", "--post-install-file=\(fs.mktemp())", "--format", "json"], format: .json
+        )
+
+        let installInfo = try JSONDecoder().decode(
+            InstallInfo.self,
+            from: output[0].data(using: .utf8)!
+        )
+
+        #expect(installInfo.version.name == "5.7.0")
+        #expect(installInfo.alreadyInstalled == false)
+    }
+
+    /// Tests that `install` command with JSON format correctly indicates when toolchain is already installed.
+    @Test(.testHomeMockedToolchain()) func installJsonFormatAlreadyInstalled() async throws {
+        // First install the toolchain
+        try await SwiftlyTests.runCommand(Install.self, ["install", "5.7.0", "--post-install-file=\(fs.mktemp())"])
+
+        // Then try to install it again with JSON format
+        let output = try await SwiftlyTests.runWithMockedIO(
+            Install.self, ["install", "5.7.0", "--post-install-file=\(fs.mktemp())", "--format", "json"], format: .json
+        )
+
+        let installInfo = try JSONDecoder().decode(
+            InstallInfo.self,
+            from: output[0].data(using: .utf8)!
+        )
+
+        #expect(installInfo.version.name == "5.7.0")
+        #expect(installInfo.alreadyInstalled == true)
+    }
 }