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diff --git a/include/jsoncons/json_exception.hpp b/include/jsoncons/json_exception.hpp
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+++ b/include/jsoncons/json_exception.hpp
@@ -0,0 +1,241 @@
+// Copyright 2013 Daniel Parker
+// Distributed under the Boost license, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+// See https://github.com/danielaparker/jsoncons for latest version
+
+#ifndef JSON_EXCEPTION_HPP
+#define JSON_EXCEPTION_HPP
+
+#include <string> // std::string
+#include <sstream> // std::ostringstream
+#include <system_error> // std::error_code
+#include <jsoncons/unicode_traits.hpp> // unicode_traits::convert
+#include <jsoncons/config/jsoncons_config.hpp>
+#include <jsoncons/more_type_traits.hpp>
+
+namespace jsoncons {
+
+    // json_exception
+
+    class json_exception
+    {
+    public:
+        virtual ~json_exception() noexcept = default;
+        virtual const char* what() const noexcept = 0;
+    };
+
+    // json_runtime_error
+
+    template <class Base, class Enable = void>
+    class json_runtime_error
+    {
+    };
+
+    template <class Base>
+    class json_runtime_error<Base,
+                             typename std::enable_if<std::is_convertible<Base*,std::exception*>::value &&
+                                                     type_traits::is_constructible_from_string<Base>::value>::type> 
+        : public Base, public virtual json_exception
+    {
+    public:
+        json_runtime_error(const std::string& s) noexcept
+            : Base(s)
+        {
+        }
+        ~json_runtime_error() noexcept
+        {
+        }
+        const char* what() const noexcept override
+        {
+            return Base::what();
+        }
+    };
+
+    class key_not_found : public std::out_of_range, public virtual json_exception
+    {
+        std::string name_;
+        mutable std::string what_;
+    public:
+        template <class CharT>
+        explicit key_not_found(const CharT* key, std::size_t length) noexcept
+            : std::out_of_range("Key not found")
+        {
+            JSONCONS_TRY
+            {
+                unicode_traits::convert(key, length, name_,
+                                 unicode_traits::conv_flags::strict);
+            }
+            JSONCONS_CATCH(...)
+            {
+            }
+        }
+
+        virtual ~key_not_found() noexcept
+        {
+        }
+
+        const char* what() const noexcept override
+        {
+            if (what_.empty())
+            {
+                JSONCONS_TRY
+                {
+                    what_.append(std::out_of_range::what());
+                    what_.append(": '");
+                    what_.append(name_);
+                    what_.append("'");
+                    return what_.c_str();
+                }
+                JSONCONS_CATCH(...)
+                {
+                    return std::out_of_range::what();
+                }
+            }
+            else
+            {
+                return what_.c_str();
+            }
+        }
+    };
+
+    class not_an_object : public std::runtime_error, public virtual json_exception
+    {
+        std::string name_;
+        mutable std::string what_;
+    public:
+        template <class CharT>
+        explicit not_an_object(const CharT* key, std::size_t length) noexcept
+            : std::runtime_error("Attempting to access a member of a value that is not an object")
+        {
+            JSONCONS_TRY
+            {
+                unicode_traits::convert(key, length, name_,
+                                 unicode_traits::conv_flags::strict);
+            }
+            JSONCONS_CATCH(...)
+            {
+            }
+        }
+
+        virtual ~not_an_object() noexcept
+        {
+        }
+        const char* what() const noexcept override
+        {
+            if (what_.empty())
+            {
+                JSONCONS_TRY
+                {
+                    what_.append(std::runtime_error::what());
+                    what_.append(": '");
+                    what_.append(name_);
+                    what_.append("'");
+                    return what_.c_str();
+                }
+                JSONCONS_CATCH(...)
+                {
+                    return std::runtime_error::what();
+                }
+            }
+            else
+            {
+                return what_.c_str();
+            }
+        }
+    };
+
+    class ser_error : public std::system_error, public virtual json_exception
+    {
+        std::size_t line_number_;
+        std::size_t column_number_;
+        mutable std::string what_;
+    public:
+        ser_error(std::error_code ec)
+            : std::system_error(ec), line_number_(0), column_number_(0)
+        {
+        }
+        ser_error(std::error_code ec, const std::string& what_arg)
+            : std::system_error(ec, what_arg), line_number_(0), column_number_(0)
+        {
+        }
+        ser_error(std::error_code ec, std::size_t position)
+            : std::system_error(ec), line_number_(0), column_number_(position)
+        {
+        }
+        ser_error(std::error_code ec, std::size_t line, std::size_t column)
+            : std::system_error(ec), line_number_(line), column_number_(column)
+        {
+        }
+        ser_error(const ser_error& other) = default;
+
+        ser_error(ser_error&& other) = default;
+
+        const char* what() const noexcept override
+        {
+            if (what_.empty())
+            {
+                JSONCONS_TRY
+                {
+                    what_.append(std::system_error::what());
+                    if (line_number_ != 0 && column_number_ != 0)
+                    {
+                        what_.append(" at line ");
+                        what_.append(std::to_string(line_number_));
+                        what_.append(" and column ");
+                        what_.append(std::to_string(column_number_));
+                    }
+                    else if (column_number_ != 0)
+                    {
+                        what_.append(" at position ");
+                        what_.append(std::to_string(column_number_));
+                    }
+                    return what_.c_str();
+                }
+                JSONCONS_CATCH(...)
+                {
+                    return std::system_error::what();
+                }
+            }
+            else
+            {
+                return what_.c_str();
+            }
+        }
+
+        std::size_t line() const noexcept
+        {
+            return line_number_;
+        }
+
+        std::size_t column() const noexcept
+        {
+            return column_number_;
+        }
+
+    #if !defined(JSONCONS_NO_DEPRECATED)
+        JSONCONS_DEPRECATED_MSG("Instead, use line()")
+        std::size_t line_number() const noexcept
+        {
+            return line();
+        }
+
+        JSONCONS_DEPRECATED_MSG("Instead, use column()")
+        std::size_t column_number() const noexcept
+        {
+            return column();
+        }
+    #endif
+    };
+
+#if !defined(JSONCONS_NO_DEPRECATED)
+JSONCONS_DEPRECATED_MSG("Instead, use ser_error") typedef ser_error serialization_error;
+JSONCONS_DEPRECATED_MSG("Instead, use ser_error") typedef ser_error json_parse_exception;
+JSONCONS_DEPRECATED_MSG("Instead, use ser_error") typedef ser_error parse_exception;
+JSONCONS_DEPRECATED_MSG("Instead, use ser_error") typedef ser_error parse_error;
+typedef ser_error codec_error;
+#endif
+
+} // namespace jsoncons
+
+#endif