diff --git a/phosphor-power-sequencer/src/config_file_parser.cpp b/phosphor-power-sequencer/src/config_file_parser.cpp
new file mode 100644
index 0000000..db055d1
--- /dev/null
+++ b/phosphor-power-sequencer/src/config_file_parser.cpp
@@ -0,0 +1,173 @@
+/**
+ * Copyright © 2024 IBM Corporation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "config_file_parser.hpp"
+
+#include "config_file_parser_error.hpp"
+
+#include <exception>
+#include <fstream>
+#include <optional>
+
+using json = nlohmann::json;
+
+namespace phosphor::power::sequencer::config_file_parser
+{
+
+std::vector<std::unique_ptr<Rail>> parse(const std::filesystem::path& pathName)
+{
+    try
+    {
+        // Use standard JSON parser to create tree of JSON elements
+        std::ifstream file{pathName};
+        json rootElement = json::parse(file);
+
+        // Parse tree of JSON elements and return corresponding C++ objects
+        return internal::parseRoot(rootElement);
+    }
+    catch (const std::exception& e)
+    {
+        throw ConfigFileParserError{pathName, e.what()};
+    }
+}
+
+namespace internal
+{
+
+GPIO parseGPIO(const json& element)
+{
+    verifyIsObject(element);
+    unsigned int propertyCount{0};
+
+    // Required line property
+    const json& lineElement = getRequiredProperty(element, "line");
+    unsigned int line = parseUnsignedInteger(lineElement);
+    ++propertyCount;
+
+    // Optional active_low property
+    bool activeLow{false};
+    auto activeLowIt = element.find("active_low");
+    if (activeLowIt != element.end())
+    {
+        activeLow = parseBoolean(*activeLowIt);
+        ++propertyCount;
+    }
+
+    // Verify no invalid properties exist
+    verifyPropertyCount(element, propertyCount);
+
+    return GPIO(line, activeLow);
+}
+
+std::unique_ptr<Rail> parseRail(const json& element)
+{
+    verifyIsObject(element);
+    unsigned int propertyCount{0};
+
+    // Required name property
+    const json& nameElement = getRequiredProperty(element, "name");
+    std::string name = parseString(nameElement);
+    ++propertyCount;
+
+    // Optional presence property
+    std::optional<std::string> presence{};
+    auto presenceIt = element.find("presence");
+    if (presenceIt != element.end())
+    {
+        presence = parseString(*presenceIt);
+        ++propertyCount;
+    }
+
+    // Optional page property
+    std::optional<uint8_t> page{};
+    auto pageIt = element.find("page");
+    if (pageIt != element.end())
+    {
+        page = parseUint8(*pageIt);
+        ++propertyCount;
+    }
+
+    // Optional check_status_vout property
+    bool checkStatusVout{false};
+    auto checkStatusVoutIt = element.find("check_status_vout");
+    if (checkStatusVoutIt != element.end())
+    {
+        checkStatusVout = parseBoolean(*checkStatusVoutIt);
+        ++propertyCount;
+    }
+
+    // Optional compare_voltage_to_limits property
+    bool compareVoltageToLimits{false};
+    auto compareVoltageToLimitsIt = element.find("compare_voltage_to_limits");
+    if (compareVoltageToLimitsIt != element.end())
+    {
+        compareVoltageToLimits = parseBoolean(*compareVoltageToLimitsIt);
+        ++propertyCount;
+    }
+
+    // Optional gpio property
+    std::optional<GPIO> gpio{};
+    auto gpioIt = element.find("gpio");
+    if (gpioIt != element.end())
+    {
+        gpio = parseGPIO(*gpioIt);
+        ++propertyCount;
+    }
+
+    // If check_status_vout or compare_voltage_to_limits property is true,
+    // the page property is required; verify page was specified
+    if ((checkStatusVout || compareVoltageToLimits) && !page.has_value())
+    {
+        throw std::invalid_argument{"Required property missing: page"};
+    }
+
+    // Verify no invalid properties exist
+    verifyPropertyCount(element, propertyCount);
+
+    return std::make_unique<Rail>(name, presence, page, checkStatusVout,
+                                  compareVoltageToLimits, gpio);
+}
+
+std::vector<std::unique_ptr<Rail>> parseRailArray(const json& element)
+{
+    verifyIsArray(element);
+    std::vector<std::unique_ptr<Rail>> rails;
+    for (auto& railElement : element)
+    {
+        rails.emplace_back(parseRail(railElement));
+    }
+    return rails;
+}
+
+std::vector<std::unique_ptr<Rail>> parseRoot(const json& element)
+{
+    verifyIsObject(element);
+    unsigned int propertyCount{0};
+
+    // Required rails property
+    const json& railsElement = getRequiredProperty(element, "rails");
+    std::vector<std::unique_ptr<Rail>> rails = parseRailArray(railsElement);
+    ++propertyCount;
+
+    // Verify no invalid properties exist
+    verifyPropertyCount(element, propertyCount);
+
+    return rails;
+}
+
+} // namespace internal
+
+} // namespace phosphor::power::sequencer::config_file_parser
diff --git a/phosphor-power-sequencer/src/config_file_parser.hpp b/phosphor-power-sequencer/src/config_file_parser.hpp
new file mode 100644
index 0000000..3764b7c
--- /dev/null
+++ b/phosphor-power-sequencer/src/config_file_parser.hpp
@@ -0,0 +1,265 @@
+/**
+ * Copyright © 2024 IBM Corporation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#pragma once
+
+#include "rail.hpp"
+
+#include <nlohmann/json.hpp>
+
+#include <cstdint>
+#include <filesystem>
+#include <stdexcept>
+#include <string>
+#include <vector>
+
+namespace phosphor::power::sequencer::config_file_parser
+{
+
+/**
+ * Parses the specified JSON configuration file.
+ *
+ * Returns the corresponding C++ Rail objects.
+ *
+ * Throws a ConfigFileParserError if an error occurs.
+ *
+ * @param pathName configuration file path name
+ * @return vector of Rail objects
+ */
+std::vector<std::unique_ptr<Rail>> parse(const std::filesystem::path& pathName);
+
+/*
+ * Internal implementation details for parse()
+ */
+namespace internal
+{
+
+/**
+ * Returns the specified property of the specified JSON element.
+ *
+ * Throws an invalid_argument exception if the property does not exist.
+ *
+ * @param element JSON element
+ * @param property property name
+ */
+#pragma GCC diagnostic push
+#if __GNUC__ == 13
+#pragma GCC diagnostic ignored "-Wdangling-reference"
+#endif
+inline const nlohmann::json& getRequiredProperty(const nlohmann::json& element,
+                                                 const std::string& property)
+{
+    auto it = element.find(property);
+    if (it == element.end())
+    {
+        throw std::invalid_argument{"Required property missing: " + property};
+    }
+    return *it;
+}
+#pragma GCC diagnostic pop
+
+/**
+ * Parses a JSON element containing a boolean.
+ *
+ * Returns the corresponding C++ boolean value.
+ *
+ * Throws an exception if parsing fails.
+ *
+ * @param element JSON element
+ * @return boolean value
+ */
+inline bool parseBoolean(const nlohmann::json& element)
+{
+    // Verify element contains a boolean
+    if (!element.is_boolean())
+    {
+        throw std::invalid_argument{"Element is not a boolean"};
+    }
+    return element.get<bool>();
+}
+
+/**
+ * Parses a JSON element containing a GPIO.
+ *
+ * Returns the corresponding C++ GPIO object.
+ *
+ * Throws an exception if parsing fails.
+ *
+ * @param element JSON element
+ * @return GPIO object
+ */
+GPIO parseGPIO(const nlohmann::json& element);
+
+/**
+ * Parses a JSON element containing a rail.
+ *
+ * Returns the corresponding C++ Rail object.
+ *
+ * Throws an exception if parsing fails.
+ *
+ * @param element JSON element
+ * @return Rail object
+ */
+std::unique_ptr<Rail> parseRail(const nlohmann::json& element);
+
+/**
+ * Parses a JSON element containing an array of rails.
+ *
+ * Returns the corresponding C++ Rail objects.
+ *
+ * Throws an exception if parsing fails.
+ *
+ * @param element JSON element
+ * @return vector of Rail objects
+ */
+std::vector<std::unique_ptr<Rail>>
+    parseRailArray(const nlohmann::json& element);
+
+/**
+ * Parses the JSON root element of the entire configuration file.
+ *
+ * Returns the corresponding C++ Rail objects.
+ *
+ * Throws an exception if parsing fails.
+ *
+ * @param element JSON element
+ * @return vector of Rail objects
+ */
+std::vector<std::unique_ptr<Rail>> parseRoot(const nlohmann::json& element);
+
+/**
+ * Parses a JSON element containing a string.
+ *
+ * Returns the corresponding C++ string.
+ *
+ * Throws an exception if parsing fails.
+ *
+ * @param element JSON element
+ * @param isEmptyValid indicates whether an empty string value is valid
+ * @return string value
+ */
+inline std::string parseString(const nlohmann::json& element,
+                               bool isEmptyValid = false)
+{
+    if (!element.is_string())
+    {
+        throw std::invalid_argument{"Element is not a string"};
+    }
+    std::string value = element.get<std::string>();
+    if (value.empty() && !isEmptyValid)
+    {
+        throw std::invalid_argument{"Element contains an empty string"};
+    }
+    return value;
+}
+
+/**
+ * Parses a JSON element containing an 8-bit unsigned integer.
+ *
+ * Returns the corresponding C++ uint8_t value.
+ *
+ * Throws an exception if parsing fails.
+ *
+ * @param element JSON element
+ * @return uint8_t value
+ */
+inline uint8_t parseUint8(const nlohmann::json& element)
+{
+    // Verify element contains an integer
+    if (!element.is_number_integer())
+    {
+        throw std::invalid_argument{"Element is not an integer"};
+    }
+    int value = element.get<int>();
+    if ((value < 0) || (value > UINT8_MAX))
+    {
+        throw std::invalid_argument{"Element is not an 8-bit unsigned integer"};
+    }
+    return static_cast<uint8_t>(value);
+}
+
+/**
+ * Parses a JSON element containing an unsigned integer.
+ *
+ * Returns the corresponding C++ unsigned int value.
+ *
+ * Throws an exception if parsing fails.
+ *
+ * @param element JSON element
+ * @return unsigned int value
+ */
+inline unsigned int parseUnsignedInteger(const nlohmann::json& element)
+{
+    // Verify element contains an unsigned integer
+    if (!element.is_number_unsigned())
+    {
+        throw std::invalid_argument{"Element is not an unsigned integer"};
+    }
+    return element.get<unsigned int>();
+}
+
+/**
+ * Verifies that the specified JSON element is a JSON array.
+ *
+ * Throws an invalid_argument exception if the element is not an array.
+ *
+ * @param element JSON element
+ */
+inline void verifyIsArray(const nlohmann::json& element)
+{
+    if (!element.is_array())
+    {
+        throw std::invalid_argument{"Element is not an array"};
+    }
+}
+
+/**
+ * Verifies that the specified JSON element is a JSON object.
+ *
+ * Throws an invalid_argument exception if the element is not an object.
+ *
+ * @param element JSON element
+ */
+inline void verifyIsObject(const nlohmann::json& element)
+{
+    if (!element.is_object())
+    {
+        throw std::invalid_argument{"Element is not an object"};
+    }
+}
+
+/**
+ * Verifies that the specified JSON element contains the expected number of
+ * properties.
+ *
+ * Throws an invalid_argument exception if the element contains a different
+ * number of properties.  This indicates the element contains an invalid
+ * property.
+ *
+ * @param element JSON element
+ * @param expectedCount expected number of properties in element
+ */
+inline void verifyPropertyCount(const nlohmann::json& element,
+                                unsigned int expectedCount)
+{
+    if (element.size() != expectedCount)
+    {
+        throw std::invalid_argument{"Element contains an invalid property"};
+    }
+}
+
+} // namespace internal
+
+} // namespace phosphor::power::sequencer::config_file_parser
diff --git a/phosphor-power-sequencer/src/config_file_parser_error.hpp b/phosphor-power-sequencer/src/config_file_parser_error.hpp
new file mode 100644
index 0000000..4c77952
--- /dev/null
+++ b/phosphor-power-sequencer/src/config_file_parser_error.hpp
@@ -0,0 +1,85 @@
+/**
+ * Copyright © 2024 IBM Corporation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#pragma once
+
+#include <exception>
+#include <filesystem>
+#include <string>
+
+namespace phosphor::power::sequencer
+{
+
+/**
+ * @class ConfigFileParserError
+ *
+ * An error that occurred while parsing a JSON configuration file.
+ */
+class ConfigFileParserError : public std::exception
+{
+  public:
+    // Specify which compiler-generated methods we want
+    ConfigFileParserError() = delete;
+    ConfigFileParserError(const ConfigFileParserError&) = default;
+    ConfigFileParserError(ConfigFileParserError&&) = default;
+    ConfigFileParserError& operator=(const ConfigFileParserError&) = default;
+    ConfigFileParserError& operator=(ConfigFileParserError&&) = default;
+    virtual ~ConfigFileParserError() = default;
+
+    /**
+     * Constructor.
+     *
+     * @param pathName Configuration file path name
+     * @param error Error message
+     */
+    explicit ConfigFileParserError(const std::filesystem::path& pathName,
+                                   const std::string& error) :
+        pathName{pathName},
+        error{"ConfigFileParserError: " + pathName.string() + ": " + error}
+    {}
+
+    /**
+     * Returns the configuration file path name.
+     *
+     * @return path name
+     */
+    const std::filesystem::path& getPathName()
+    {
+        return pathName;
+    }
+
+    /**
+     * Returns the description of this error.
+     *
+     * @return error description
+     */
+    const char* what() const noexcept override
+    {
+        return error.c_str();
+    }
+
+  private:
+    /**
+     * Configuration file path name.
+     */
+    const std::filesystem::path pathName;
+
+    /**
+     * Error message.
+     */
+    const std::string error{};
+};
+
+} // namespace phosphor::power::sequencer
diff --git a/phosphor-power-sequencer/src/meson.build b/phosphor-power-sequencer/src/meson.build
index de691c9..faab116 100644
--- a/phosphor-power-sequencer/src/meson.build
+++ b/phosphor-power-sequencer/src/meson.build
@@ -3,6 +3,18 @@
     '../..'
 )
 
+phosphor_power_sequencer_library = static_library(
+    'phosphor-power-sequencer',
+    'config_file_parser.cpp',
+    implicit_include_directories: false,
+    dependencies: [
+        nlohmann_json_dep
+    ],
+    include_directories: [
+        phosphor_power_sequencer_include_directories
+    ]
+)
+
 phosphor_power_sequencer = executable(
     'phosphor-power-control',
     'power_control_main.cpp',