Index: llvm/test/tools/llvm-readobj/ELF/output-style.test
===================================================================
--- llvm/test/tools/llvm-readobj/ELF/output-style.test
+++ llvm/test/tools/llvm-readobj/ELF/output-style.test
@@ -1,4 +1,4 @@
 ## Error for an unknown output style.
 RUN: not llvm-readobj --elf-output-style=unknown 2>&1 | FileCheck %s
 
-CHECK: error: --elf-output-style value should be either 'LLVM' or 'GNU'
+CHECK: error: --elf-output-style value should be either 'LLVM', 'GNU', or 'JSON' but was 'unknown'
Index: llvm/tools/llvm-readobj/ELFDumper.cpp
===================================================================
--- llvm/tools/llvm-readobj/ELFDumper.cpp
+++ llvm/tools/llvm-readobj/ELFDumper.cpp
@@ -31,6 +31,7 @@
 #include "llvm/BinaryFormat/AMDGPUMetadataVerifier.h"
 #include "llvm/BinaryFormat/ELF.h"
 #include "llvm/Demangle/Demangle.h"
+#include "llvm/Object/Archive.h"
 #include "llvm/Object/ELF.h"
 #include "llvm/Object/ELFObjectFile.h"
 #include "llvm/Object/ELFTypes.h"
@@ -548,6 +549,9 @@
     assert(&this->W.getOStream() == &llvm::fouts());
   }
 
+  void printFileSummary(StringRef FileStr, ObjectFile &Obj,
+                        ArrayRef<std::string> InputFilenames,
+                        const Archive *A) override;
   void printFileHeaders() override;
   void printGroupSections() override;
   void printRelocations() override;
@@ -705,9 +709,27 @@
   void printMipsPLT(const MipsGOTParser<ELFT> &Parser) override;
   void printMipsABIFlags() override;
 
+protected:
   ScopedPrinter &W;
 };
 
+// JSONELFDumper shares most of the same implementation as LLVMELFDumper except
+// it uses a JSONScopedPrinter.
+template <typename ELFT> class JSONELFDumper : public LLVMELFDumper<ELFT> {
+public:
+  LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
+
+  JSONELFDumper(const object::ELFObjectFile<ELFT> &ObjF, ScopedPrinter &Writer)
+      : LLVMELFDumper<ELFT>(ObjF, Writer) {}
+
+  void printFileSummary(StringRef FileStr, ObjectFile &Obj,
+                        ArrayRef<std::string> InputFilenames,
+                        const Archive *A) override;
+
+private:
+  std::unique_ptr<DictScope> FileScope;
+};
+
 } // end anonymous namespace
 
 namespace llvm {
@@ -717,6 +739,8 @@
 createELFDumper(const ELFObjectFile<ELFT> &Obj, ScopedPrinter &Writer) {
   if (opts::Output == opts::GNU)
     return std::make_unique<GNUELFDumper<ELFT>>(Obj, Writer);
+  else if (opts::Output == opts::JSON)
+    return std::make_unique<JSONELFDumper<ELFT>>(Obj, Writer);
   return std::make_unique<LLVMELFDumper<ELFT>>(Obj, Writer);
 }
 
@@ -3231,6 +3255,16 @@
   return nullptr;
 }
 
+template <class ELFT>
+void GNUELFDumper<ELFT>::printFileSummary(StringRef FileStr, ObjectFile &Obj,
+                                          ArrayRef<std::string> InputFilenames,
+                                          const Archive *A) {
+  if (InputFilenames.size() > 1 || A) {
+    this->W.startLine() << "\n";
+    this->W.printString("File", FileStr);
+  }
+}
+
 template <class ELFT> void GNUELFDumper<ELFT>::printFileHeaders() {
   const Elf_Ehdr &e = this->Obj.getHeader();
   OS << "ELF Header:\n";
@@ -7299,3 +7333,18 @@
   W.printFlags("Flags 1", Flags->flags1, makeArrayRef(ElfMipsFlags1));
   W.printHex("Flags 2", Flags->flags2);
 }
+
+template <class ELFT>
+void JSONELFDumper<ELFT>::printFileSummary(StringRef FileStr, ObjectFile &Obj,
+                                           ArrayRef<std::string> InputFilenames,
+                                           const Archive *A) {
+  FileScope = std::make_unique<DictScope>(this->W, FileStr);
+  DictScope D(this->W, "FileSummary");
+  this->W.printString("File", FileStr);
+  this->W.printString("Format", Obj.getFileFormatName());
+  this->W.printString("Arch", Triple::getArchTypeName(Obj.getArch()));
+  this->W.printString(
+      "AddressSize",
+      std::string(formatv("{0}bit", 8 * Obj.getBytesInAddress())));
+  this->printLoadName();
+}
Index: llvm/tools/llvm-readobj/ObjDumper.h
===================================================================
--- llvm/tools/llvm-readobj/ObjDumper.h
+++ llvm/tools/llvm-readobj/ObjDumper.h
@@ -20,6 +20,7 @@
 
 namespace llvm {
 namespace object {
+class Archive;
 class COFFImportFile;
 class ObjectFile;
 class XCOFFObjectFile;
@@ -39,6 +40,9 @@
 
   virtual bool canDumpContent() { return true; }
 
+  virtual void printFileSummary(StringRef FileStr, object::ObjectFile &Obj,
+                                ArrayRef<std::string> InputFilenames,
+                                const object::Archive *A);
   virtual void printFileHeaders() = 0;
   virtual void printSectionHeaders() = 0;
   virtual void printRelocations() = 0;
Index: llvm/tools/llvm-readobj/ObjDumper.cpp
===================================================================
--- llvm/tools/llvm-readobj/ObjDumper.cpp
+++ llvm/tools/llvm-readobj/ObjDumper.cpp
@@ -13,6 +13,7 @@
 
 #include "ObjDumper.h"
 #include "llvm-readobj.h"
+#include "llvm/Object/Archive.h"
 #include "llvm/Object/ObjectFile.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Support/FormatVariadic.h"
@@ -85,6 +86,18 @@
   }
 }
 
+void ObjDumper::printFileSummary(StringRef FileStr, object::ObjectFile &Obj,
+                                 ArrayRef<std::string> InputFilenames,
+                                 const object::Archive *A) {
+  W.startLine() << "\n";
+  W.printString("File", FileStr);
+  W.printString("Format", Obj.getFileFormatName());
+  W.printString("Arch", Triple::getArchTypeName(Obj.getArch()));
+  W.printString("AddressSize",
+                std::string(formatv("{0}bit", 8 * Obj.getBytesInAddress())));
+  this->printLoadName();
+}
+
 static std::vector<object::SectionRef>
 getSectionRefsByNameOrIndex(const object::ObjectFile &Obj,
                             ArrayRef<std::string> Sections) {
Index: llvm/tools/llvm-readobj/llvm-readobj.h
===================================================================
--- llvm/tools/llvm-readobj/llvm-readobj.h
+++ llvm/tools/llvm-readobj/llvm-readobj.h
@@ -39,7 +39,7 @@
 extern bool RawRelr;
 extern bool CodeViewSubsectionBytes;
 extern bool Demangle;
-enum OutputStyleTy { LLVM, GNU };
+enum OutputStyleTy { LLVM, GNU, JSON, UNKNOWN };
 extern OutputStyleTy Output;
 } // namespace opts
 
Index: llvm/tools/llvm-readobj/llvm-readobj.cpp
===================================================================
--- llvm/tools/llvm-readobj/llvm-readobj.cpp
+++ llvm/tools/llvm-readobj/llvm-readobj.cpp
@@ -230,13 +230,17 @@
   opts::DynamicTable = Args.hasArg(OPT_dynamic_table);
   opts::ELFLinkerOptions = Args.hasArg(OPT_elf_linker_options);
   if (Arg *A = Args.getLastArg(OPT_elf_output_style_EQ)) {
-    StringRef V(A->getValue());
-    if (V == "LLVM")
-      opts::Output = opts::OutputStyleTy::LLVM;
-    else if (V == "GNU")
-      opts::Output = opts::OutputStyleTy::GNU;
-    else
-      error("--elf-output-style value should be either 'LLVM' or 'GNU'");
+    std::string OutputStyleChoice = A->getValue();
+    opts::Output = StringSwitch<opts::OutputStyleTy>(OutputStyleChoice)
+                       .Case("LLVM", opts::OutputStyleTy::LLVM)
+                       .Case("GNU", opts::OutputStyleTy::GNU)
+                       .Case("JSON", opts::OutputStyleTy::JSON)
+                       .Default(opts::OutputStyleTy::UNKNOWN);
+    if (opts::Output == opts::OutputStyleTy::UNKNOWN) {
+      error("--elf-output-style value should be either 'LLVM', 'GNU', or "
+            "'JSON' but was '" +
+            OutputStyleChoice + "'");
+    }
   }
   opts::GnuHashTable = Args.hasArg(OPT_gnu_hash_table);
   opts::HashSymbols = Args.hasArg(OPT_hash_symbols);
@@ -333,18 +337,7 @@
     reportError(DumperOrErr.takeError(), FileStr);
   Dumper = (*DumperOrErr).get();
 
-  if (opts::Output == opts::LLVM || opts::InputFilenames.size() > 1 || A) {
-    Writer.startLine() << "\n";
-    Writer.printString("File", FileStr);
-  }
-  if (opts::Output == opts::LLVM) {
-    Writer.printString("Format", Obj.getFileFormatName());
-    Writer.printString("Arch", Triple::getArchTypeName(Obj.getArch()));
-    Writer.printString(
-        "AddressSize",
-        std::string(formatv("{0}bit", 8 * Obj.getBytesInAddress())));
-    Dumper->printLoadName();
-  }
+  Dumper->printFileSummary(FileStr, Obj, opts::InputFilenames, A);
 
   if (opts::FileHeaders)
     Dumper->printFileHeaders();
@@ -550,6 +543,12 @@
       OwningBinary<Binary>(std::move(Bin), std::move(Buffer)));
 }
 
+std::unique_ptr<ScopedPrinter> createWriter() {
+  if (opts::Output == opts::JSON)
+    return std::make_unique<JSONScopedPrinter>(fouts());
+  return std::make_unique<ScopedPrinter>(fouts());
+}
+
 int main(int argc, char *argv[]) {
   InitLLVM X(argc, argv);
   BumpPtrAllocator A;
@@ -610,16 +609,20 @@
     opts::SectionHeaders = true;
   }
 
-  ScopedPrinter Writer(fouts());
+  std::unique_ptr<ScopedPrinter> Writer = createWriter();
+  std::unique_ptr<ListScope> D;
+  if (opts::Output == opts::JSON)
+    D = std::make_unique<ListScope>(*Writer.get());
+
   for (const std::string &I : opts::InputFilenames)
-    dumpInput(I, Writer);
+    dumpInput(I, *Writer.get());
 
   if (opts::CodeViewMergedTypes) {
     if (opts::CodeViewEnableGHash)
-      dumpCodeViewMergedTypes(Writer, CVTypes.GlobalIDTable.records(),
+      dumpCodeViewMergedTypes(*Writer.get(), CVTypes.GlobalIDTable.records(),
                               CVTypes.GlobalTypeTable.records());
     else
-      dumpCodeViewMergedTypes(Writer, CVTypes.IDTable.records(),
+      dumpCodeViewMergedTypes(*Writer.get(), CVTypes.IDTable.records(),
                               CVTypes.TypeTable.records());
   }