diff --git a/CMakeLists.txt b/CMakeLists.txt
index eb5c9a6..caef769 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,7 +22,8 @@ set(LINUX_GL_LIBS -lGL)
 
 find_package(SDL2 REQUIRED)
 find_package(Freetype 2 REQUIRED)
-set(LIBS -lpcre2-8 -lpcre2-posix SDL2 imgui)
+find_package(nlohmann_json REQUIRED)
+set(LIBS -lpcre2-8 -lpcre2-posix SDL2 nlohmann_json::nlohmann_json imgui)
 set(IMGUI_LIBS SDL2 Freetype::Freetype)
 
 set(INCLUDES imgui imgui/backends imgui/misc/cpp imgui/freetype /usr/include/SDL2)
diff --git a/config.cpp b/config.cpp
index fb9446d..a5e1f06 100644
--- a/config.cpp
+++ b/config.cpp
@@ -1,11 +1,8 @@
-#include <cstdio>
 #include <cstdlib>
 #include <cstring>
-#include <cmath>
-#include <cfloat>
 #include <sys/stat.h>
 #include <string>
-#include <memory>
+#include <nlohmann/json.hpp>
 
 #include "log.h"
 #include "misc.h"
@@ -26,49 +23,6 @@ static void fclose_and_log(FILE* file) {
     log(std::string("Failed to close a file: fclose(): ") + strerror(errno));
 }
 
-static bool write(const std::string& ptr, FILE* file) {
-    return fwrite(ptr.data(), sizeof(char), ptr.size(), file) == ptr.size() * sizeof(char);
-}
-static bool write(const char* ptr, FILE* file) {
-    return fwrite(ptr, 1, strlen(ptr), file) == strlen(ptr);
-}
-
-static inline float to_float(const char* str) {
-    char* endptr;
-
-    while (isspace(str[0])) {
-        str++;
-    }
-    if (str[0] == '\0') {
-        throw std::invalid_argument("float string is empty");
-    }
-
-    errno = 0;
-    float res = strtof(str, &endptr);
-    if (res == HUGE_VALF && errno == ERANGE) {
-        throw std::overflow_error(std::string(str) + " is bigger than HUGE_VALF");
-    } else if (res == FLT_MIN && errno == ERANGE) {
-        throw std::underflow_error(std::string(str) + " is smaller than FLT_MIN");
-    } else if (endptr[0] != '\0') {
-        throw std::invalid_argument(std::string(str) + " has trailing text");
-    }
-    return res;
-}
-
-static bool validate_font_size_or_log(float size) {
-    if (size <= 0.0f) {
-        log(std::string("Font size ") + std::to_string(size) + " is lower or equal to 0");
-        return false;
-    } else if (std::isnan(size)) {
-        log(std::string("Font size ") + std::to_string(size) + " is NaN");
-        return false;
-    } else if (std::isinf(size)) {
-        log(std::string("Font size ") + std::to_string(size) + " is infinity or negative infinity");
-        return false;
-    }
-    return true;
-}
-
 
 std::string get_config_folder() {
     const char* path;
@@ -86,7 +40,7 @@ std::string get_config_folder() {
 }
 
 std::string get_config_file_path() {
-    return get_config_folder() + "/config";
+    return get_config_folder() + "/config.json";
 }
 
 // tries to create a directory with an empty string if it's just "/" but who cares
@@ -112,59 +66,11 @@ void create_config_folders_if_necessary() {
 }
 
 
-static inline void parse_config_line(Config& config, char* line) {
-    if (strncmp(line, "logcat_command=", 15 * sizeof(char)) == 0) {
-        config.logcat_command = &line[15];
-    } else if (strncmp(line, "normal_font_size=", 17 * sizeof(char)) == 0) {
-        float size = to_float(&line[17]);
-        if (validate_font_size_or_log(size)) {
-            config.normal_font_size = size;
-        }
-    } else if (strncmp(line, "monospace_font_size=", 20 * sizeof(char)) == 0) {
-        float size = to_float(&line[20]);
-        if (validate_font_size_or_log(size)) {
-            config.monospace_font_size = size;
-        }
-    } else if (line[0] != '\0') {
-        throw std::invalid_argument(std::string("unknown config line: ") + line);
-    }
-}
-
-static inline Config load_config(FILE* file) {
-    size_t line_capacity_size = 128 * sizeof(char);
-    char* line = static_cast<char*>(malloc(line_capacity_size));
-    if (line == nullptr) {
-        throw std::bad_alloc();
-    }
-    Config config;
-
-    while (true) {
-        errno = 0;
-        if (getline(&line, &line_capacity_size, file) < 0) {
-            // https://stackoverflow.com/questions/30569981/does-free-set-errno
-            int errsv = errno;
-            free(line);
-            if (errsv) {
-                throw_system_error(errsv, "getline()");
-            }
-            break;
-        }
-        if (line_capacity_size == 0 || line[0] == '\0' || line[0] == '#') {
-            continue;
-        }
-        if (char* newline = strchr(line, '\n')) {
-            *newline = '\0';
-        }
-
-        try {
-            parse_config_line(config, line);
-        } catch (const std::exception& e) {
-            free(line);
-            throw;
-        }
-    }
-
-    return config;
+void from_json(const nlohmann::json& j, Config& config) {
+    j.at("logcat_command").get_to(config.logcat_command);
+    j.at("normal_font_size").get_to(config.normal_font_size);
+    j.at("monospace_font_size").get_to(config.monospace_font_size);
+    j.at("filters").get_to(config.filters);
 }
 
 Config load_config() {
@@ -175,37 +81,15 @@ Config load_config() {
         return Config();
     }
 
-    return load_config(config_file.get());
+    return nlohmann::json::parse(config_file.get()).get<Config>();
 }
 
 
-static inline void write_config(FILE* file, const Config& config) {
-    if (!write("# This is an auto-generated file, modifications will be lost\n"
-               "# This is a poor man's config file \"format\", there are only three legal lines:\n"
-               "#     # a comment, only available at the start of a line\n"
-               "#     (an empty line, no whitespace)\n"
-               "#     key=value pairs, no spaces around the delimiter, and no unknown keys\n\n", file)) {
-        throw std::runtime_error("Failed to write info comment");
-    }
-    if (!write("logcat_command=", file)) {
-        throw std::runtime_error("Failed to write logcat command key");
-    }
-    if (!write(config.logcat_command, file)) {
-        throw std::runtime_error("Failed to write logcat command value");
-    }
-
-    if (!write("\nnormal_font_size=", file)) {
-        throw std::runtime_error("Failed to write normal font size key");
-    }
-    if (!write(std::to_string(config.normal_font_size), file)) {
-        throw std::runtime_error("Failed to write normal font size value");
-    }
-    if (!write("\nmonospace_font_size=", file)) {
-        throw std::runtime_error("Failed to write monospace font size key");
-    }
-    if (!write(std::to_string(config.monospace_font_size), file)) {
-        throw std::runtime_error("Failed to write monospace font size value");
-    }
+void to_json(nlohmann::json& j, const Config& config) {
+    j["logcat_command"] = config.logcat_command;
+    j["normal_font_size"] = config.normal_font_size;
+    j["monospace_font_size"] = config.monospace_font_size;
+    j["filters"] = config.filters;
 }
 
 void write_config(const Config& config) {
@@ -213,7 +97,9 @@ void write_config(const Config& config) {
     std::string tmp_config_file_path = config_file_path + ".tmp";
 
     std::unique_ptr<FILE, decltype(&fclose_and_log)> config_file(fopen_or_raise(tmp_config_file_path.c_str(), "w", false), fclose_and_log);
-    write_config(config_file.get(), config);
+    nlohmann::json json_config = config;
+    std::string str_config = json_config.dump();
+    fwrite(str_config.data(), sizeof(char), str_config.size(), config_file.get());
     config_file.reset();
 
     if (!rename(tmp_config_file_path.c_str(), config_file_path.c_str())) {
diff --git a/config.h b/config.h
index 0b8f545..1f6fa5c 100644
--- a/config.h
+++ b/config.h
@@ -1,14 +1,20 @@
 #pragma once
 
 #include <string>
+#include <nlohmann/json.hpp>
+#include "filters.h"
 
 struct Config {
     std::string logcat_command;
     float normal_font_size = 13.0f;
     float monospace_font_size = 13.0f;
+
+    Filters filters;
 };
 
 std::string get_config_folder();
 void create_config_folders_if_necessary();
+void from_json(const nlohmann::json& j, Config& config);
 Config load_config();
+void to_json(nlohmann::json& j, const Config& config);
 void write_config(const Config& config);
diff --git a/event_loop.cpp b/event_loop.cpp
index c899cca..2d3783a 100644
--- a/event_loop.cpp
+++ b/event_loop.cpp
@@ -33,9 +33,8 @@ static inline void check_for_logcat_items(LogcatThread& logcat_thread, const Fil
 }
 
 
-void event_loop(ImFont* monospace_font, Config& active_config, Filters& active_filters, LogcatThread& logcat_thread, bool* run_event_loop) {
+void event_loop(ImFont* monospace_font, Config& active_config, LogcatThread& logcat_thread, bool* run_event_loop) {
     static Config inactive_config;
-    static Filters inactive_filters;
     static bool show_settings_window = false;
     static bool show_filters_window = false;
     static bool show_logs_window = false;
@@ -43,7 +42,7 @@ void event_loop(ImFont* monospace_font, Config& active_config, Filters& active_f
     static std::vector<LogcatEntry> logcat_entries;
     static std::vector<size_t> filtered_logcat_entry_offsets;
 
-    check_for_logcat_items(logcat_thread, active_filters, logcat_entries, filtered_logcat_entry_offsets);
+    check_for_logcat_items(logcat_thread, active_config.filters, logcat_entries, filtered_logcat_entry_offsets);
 
 #ifndef NDEBUG
     debug_window(logcat_thread);
@@ -54,7 +53,7 @@ void event_loop(ImFont* monospace_font, Config& active_config, Filters& active_f
     }
 
     if (show_filters_window) {
-        filters_window(active_filters, inactive_filters, logcat_entries, filtered_logcat_entry_offsets, &show_filters_window);
+        filters_window(active_config, inactive_config, logcat_entries, filtered_logcat_entry_offsets, &show_filters_window);
     }
 
     if (show_logs_window) {
@@ -69,6 +68,5 @@ void event_loop(ImFont* monospace_font, Config& active_config, Filters& active_f
     main_window(log_entries_read == log_entries.size(), monospace_font,
         logcat_entries, filtered_logcat_entry_offsets,
         active_config, inactive_config,
-        active_filters, inactive_filters,
         &show_settings_window, &show_filters_window, &show_logs_window, run_event_loop);
 }
diff --git a/event_loop.h b/event_loop.h
index 2bbf0fd..683a7f3 100644
--- a/event_loop.h
+++ b/event_loop.h
@@ -3,7 +3,6 @@
 #include <imgui.h>
 
 #include "config.h"
-#include "filters.h"
 #include "logcat_thread.h"
 
-void event_loop(ImFont* monospace_font, Config& active_config, Filters& active_filters, LogcatThread& logcat_thread, bool* run_event_loop);
+void event_loop(ImFont* monospace_font, Config& active_config, LogcatThread& logcat_thread, bool* run_event_loop);
diff --git a/filters.cpp b/filters.cpp
index e5c8b1e..3bc0f77 100644
--- a/filters.cpp
+++ b/filters.cpp
@@ -289,3 +289,158 @@ bool matches(const Filters& filters, const LogcatEntry& entry) {
 
     return !ok_filter_exists;
 }
+
+
+void from_json(const nlohmann::json& j, FilterKey& key) {
+    const std::string& str = j.get_ref<const nlohmann::json::string_t&>();
+
+    if (str == "BUFFER") key = FilterKey::Buffer;
+    else if (str == "USER") key = FilterKey::User;
+    else if (str == "PID") key = FilterKey::PID;
+    else if (str == "TID") key = FilterKey::TID;
+    else if (str == "PRIORITY") key = FilterKey::Priority;
+    else if (str == "TAG") key = FilterKey::Tag;
+    else if (str == "MESSAGE") key = FilterKey::Message;
+    else throw std::invalid_argument(std::string("Unknown filter key: ") + str);
+}
+
+void to_json(nlohmann::json& j, const FilterKey& key) {
+    switch (key) {
+        case FilterKey::Buffer: j = "BUFFER"; break;
+        case FilterKey::User: j = "USER"; break;
+        case FilterKey::PID: j = "PID"; break;
+        case FilterKey::TID: j = "TID"; break;
+        case FilterKey::Priority: j = "PRIORITY"; break;
+        case FilterKey::Tag: j = "TAG"; break;
+        case FilterKey::Message: j = "MESSAGE"; break;
+    }
+}
+
+void from_json(const nlohmann::json& j, GroupFilter::Type& type) {
+    const std::string& str = j.get_ref<const nlohmann::json::string_t&>();
+
+    if (str == "ALL") type = GroupFilter::Type::All;
+    else if (str == "ANY") type = GroupFilter::Type::Any;
+    else if (str == "ONE") type = GroupFilter::Type::One;
+    else if (str == "NONE") type = GroupFilter::Type::None;
+    else throw std::invalid_argument(std::string("Unknown group filter type: ") + str);
+}
+
+void to_json(nlohmann::json& j, const GroupFilter::Type& type) {
+    switch (type) {
+        case GroupFilter::Type::All: j = "ALL"; break;
+        case GroupFilter::Type::Any: j = "ANY"; break;
+        case GroupFilter::Type::One: j = "ONE"; break;
+        case GroupFilter::Type::None: j = "NONE"; break;
+    }
+}
+
+void from_json(const nlohmann::json& j, std::unique_ptr<Filter>& filter) {
+    const std::string& filter_type = j.at("type").get_ref<const nlohmann::json::string_t&>();
+    bool disabled = j.at("disabled").get<bool>();
+
+    if (filter_type == "INTEGER") {
+        filter = std::make_unique<IntegerFilter>(j.at("key").get<FilterKey>(), j.at("other").get<size_t>(), j.at("inverted").get<bool>(), disabled);
+    } else if (filter_type == "STRING") {
+        filter = std::make_unique<StringFilter>(
+            j.at("key").get<FilterKey>(), j.at("other").get<std::string>(), j.at("inverted").get<bool>(), j.at("exact_match").get<bool>(), disabled);
+    } else if (filter_type == "BUFFER") {
+        unsigned int wanted = 0;
+        nlohmann::json wanted_json = j.at("wanted");
+        if (!wanted_json.is_array()) {
+            throw std::invalid_argument("Wanted buffer items is not an array");
+        }
+        for (nlohmann::json::const_iterator it = wanted_json.cbegin(); it != wanted_json.cend(); it++) {
+            wanted |= static_cast<unsigned int>(it->get<Buffer>());
+        }
+
+        filter = std::make_unique<BufferFilter>(wanted, disabled);
+    } else if (filter_type == "PRIORITY") {
+        unsigned int wanted = 0;
+        nlohmann::json wanted_json = j.at("wanted");
+        if (!wanted_json.is_array()) {
+            throw std::invalid_argument("Wanted priority items is not an array");
+        }
+        for (nlohmann::json::const_iterator it = wanted_json.cbegin(); it != wanted_json.cend(); it++) {
+            wanted |= static_cast<unsigned int>(it->get<Priority>());
+        }
+
+        filter = std::make_unique<PriorityFilter>(wanted, disabled);
+    } else if (filter_type == "GROUP") {
+        filter = std::make_unique<GroupFilter>(
+            j.at("filters").get<std::vector<std::unique_ptr<Filter>>>(), j.at("group_type").get<GroupFilter::Type>(), disabled);
+    } else {
+        throw std::invalid_argument(std::string("Unknown filter type: ") + filter_type);
+    }
+}
+
+void to_json(nlohmann::json& j, const std::unique_ptr<Filter>& filter) {
+    j["disabled"] = filter->disabled();
+
+    if (const IntegerFilter* ifilter = dynamic_cast<const IntegerFilter*>(filter.get())) {
+        j["type"] = "INTEGER";
+        j["key"] = ifilter->key;
+        j["other"] = ifilter->other;
+        j["inverted"] = ifilter->inverted;
+    } else if (const StringFilter* sfilter = dynamic_cast<const StringFilter*>(filter.get())) {
+        j["type"] = "STRING";
+        j["key"] = sfilter->key;
+        j["other"] = sfilter->other;
+        j["inverted"] = sfilter->inverted;
+        j["exact_match"] = sfilter->exact_match;
+    } else if (const BufferFilter* bfilter = dynamic_cast<const BufferFilter*>(filter.get())) {
+        j["type"] = "BUFFER";
+        j["wanted"] = nlohmann::json::array();
+        if (bfilter->wanted & static_cast<unsigned int>(Buffer::Unknown)) {
+            j["wanted"].emplace_back(Buffer::Unknown);
+        }
+        if (bfilter->wanted & static_cast<unsigned int>(Buffer::Main)) {
+            j["wanted"].emplace_back(Buffer::Main);
+        }
+        if (bfilter->wanted & static_cast<unsigned int>(Buffer::System)) {
+            j["wanted"].emplace_back(Buffer::System);
+        }
+        if (bfilter->wanted & static_cast<unsigned int>(Buffer::Radio)) {
+            j["wanted"].emplace_back(Buffer::Radio);
+        }
+        if (bfilter->wanted & static_cast<unsigned int>(Buffer::Events)) {
+            j["wanted"].emplace_back(Buffer::Events);
+        }
+        if (bfilter->wanted & static_cast<unsigned int>(Buffer::Crash)) {
+            j["wanted"].emplace_back(Buffer::Crash);
+        }
+    } else if (const PriorityFilter* pfilter = dynamic_cast<const PriorityFilter*>(filter.get())) {
+        j["type"] = "PRIORITY";
+        j["wanted"] = nlohmann::json::array();
+        if (pfilter->wanted & static_cast<unsigned int>(Priority::Unknown)) {
+            j["wanted"].emplace_back(Priority::Unknown);
+        }
+        if (pfilter->wanted & static_cast<unsigned int>(Priority::Verbose)) {
+            j["wanted"].emplace_back(Priority::Verbose);
+        }
+        if (pfilter->wanted & static_cast<unsigned int>(Priority::Debug)) {
+            j["wanted"].emplace_back(Priority::Debug);
+        }
+        if (pfilter->wanted & static_cast<unsigned int>(Priority::Info)) {
+            j["wanted"].emplace_back(Priority::Info);
+        }
+        if (pfilter->wanted & static_cast<unsigned int>(Priority::Warn)) {
+            j["wanted"].emplace_back(Priority::Warn);
+        }
+        if (pfilter->wanted & static_cast<unsigned int>(Priority::Error)) {
+            j["wanted"].emplace_back(Priority::Error);
+        }
+        if (pfilter->wanted & static_cast<unsigned int>(Priority::Fatal)) {
+            j["wanted"].emplace_back(Priority::Fatal);
+        }
+    } else if (const GroupFilter* gfilter = dynamic_cast<const GroupFilter*>(filter.get())) {
+        j["type"] = "GROUP";
+        j["group_type"] = gfilter->type;
+        j["filters"] = nlohmann::json::array();
+        for (const std::unique_ptr<Filter>& i : gfilter->filters) {
+            j["filters"].emplace_back(i);
+        }
+    } else {
+        throw std::invalid_argument("Cannot serialize unknown filter");
+    }
+}
diff --git a/filters.h b/filters.h
index 5f9bf19..076e541 100644
--- a/filters.h
+++ b/filters.h
@@ -4,6 +4,7 @@
 #include <vector>
 #include <memory>
 #include <utility>
+#include <nlohmann/json.hpp>
 
 #include "logcat_entry.h"
 #include "pcre2_wrapper.h"
@@ -34,7 +35,7 @@ public:
 
 class IntegerFilter : public Filter {
 public:
-    IntegerFilter(FilterKey key_, size_t other_, bool inverted_ = false, bool disabled = false);
+    IntegerFilter(FilterKey key_, size_t other_, bool inverted_, bool disabled);
 
     void updated() override;
     bool disabled() const override;
@@ -57,7 +58,7 @@ public:
     StringFilter(const StringFilter&) = delete;
     StringFilter& operator=(const StringFilter&) = delete;
 
-    StringFilter(FilterKey key_, std::string other_, bool inverted_ = false, bool exact_match_ = true, bool disabled = false);
+    StringFilter(FilterKey key_, std::string other_, bool inverted_, bool exact_match_, bool disabled);
 
     void updated() override;
     bool disabled() const override;
@@ -81,7 +82,7 @@ private:
 
 class BufferFilter : public Filter {
 public:
-    BufferFilter(unsigned int wanted_, bool disabled = false);
+    BufferFilter(unsigned int wanted_, bool disabled);
 
     void updated() override;
     bool disabled() const override;
@@ -122,7 +123,7 @@ public:
         None = 3,
     };
 
-    GroupFilter(std::vector<std::unique_ptr<Filter>> filters_, Type type_, bool disabled = false);
+    GroupFilter(std::vector<std::unique_ptr<Filter>> filters_, Type type_, bool disabled);
 
     void updated() override;
     bool disabled() const override;
@@ -141,3 +142,10 @@ private:
 typedef std::vector<std::pair<std::string, std::unique_ptr<Filter>>> Filters;
 void copy_filters(Filters& filters, const Filters& other);
 bool matches(const Filters& filters, const LogcatEntry& entry);
+
+void from_json(const nlohmann::json& j, FilterKey& key);
+void to_json(nlohmann::json& j, const FilterKey& key);
+void from_json(const nlohmann::json& j, GroupFilter::Type& type);
+void to_json(nlohmann::json& j, const GroupFilter::Type& type);
+void from_json(const nlohmann::json& j, std::unique_ptr<Filter>& filter);
+void to_json(nlohmann::json& j, const std::unique_ptr<Filter>& filter);
diff --git a/logcat_entry.cpp b/logcat_entry.cpp
index 119967b..edcde21 100644
--- a/logcat_entry.cpp
+++ b/logcat_entry.cpp
@@ -122,3 +122,52 @@ std::optional<Buffer> try_parse_buffer(char* buf, size_t length) {
     if (!strncmp(buffer_str, "crash", 5)) return Buffer::Crash;
     return Buffer::Unknown;
 }
+
+
+void from_json(const nlohmann::json& j, Buffer& buffer) {
+    const std::string& str = j.get_ref<const nlohmann::json::string_t&>();
+
+    if (str == "UNKNOWN") buffer = Buffer::Unknown;
+    else if (str == "MAIN") buffer = Buffer::Main;
+    else if (str == "SYSTEM") buffer = Buffer::System;
+    else if (str == "RADIO") buffer = Buffer::Radio;
+    else if (str == "EVENTS") buffer = Buffer::Events;
+    else if (str == "CRASH") buffer = Buffer::Crash;
+    else throw std::invalid_argument(std::string("Unknown buffer value: ") + str);
+}
+
+void to_json(nlohmann::json& j, const Buffer& buffer) {
+    switch (buffer) {
+        case Buffer::Unknown: j = "UNKNOWN"; break;
+        case Buffer::Main: j = "MAIN"; break;
+        case Buffer::System: j = "SYSTEM"; break;
+        case Buffer::Radio: j = "RADIO"; break;
+        case Buffer::Events: j = "EVENTS"; break;
+        case Buffer::Crash: j = "CRASH"; break;
+    }
+}
+
+void from_json(const nlohmann::json& j, Priority& priority) {
+    const std::string& str = j.get_ref<const nlohmann::json::string_t&>();
+
+    if (str == "UNKNOWN") priority = Priority::Unknown;
+    else if (str == "VERBOSE") priority = Priority::Verbose;
+    else if (str == "DEBUG") priority = Priority::Debug;
+    else if (str == "INFO") priority = Priority::Info;
+    else if (str == "WARN") priority = Priority::Warn;
+    else if (str == "ERROR") priority = Priority::Error;
+    else if (str == "FATAL") priority = Priority::Fatal;
+    else throw std::invalid_argument(std::string("Unknown priority value: ") + str);
+}
+
+void to_json(nlohmann::json& j, const Priority& priority) {
+    switch (priority) {
+        case Priority::Unknown: j = "UNKNOWN"; break;
+        case Priority::Verbose: j = "VERBOSE"; break;
+        case Priority::Debug: j = "DEBUG"; break;
+        case Priority::Info: j = "INFO"; break;
+        case Priority::Warn: j = "WARN"; break;
+        case Priority::Error: j = "ERROR"; break;
+        case Priority::Fatal: j = "FATAL"; break;
+    }
+}
diff --git a/logcat_entry.h b/logcat_entry.h
index dc53313..bb3c517 100644
--- a/logcat_entry.h
+++ b/logcat_entry.h
@@ -2,6 +2,7 @@
 
 #include <string>
 #include <optional>
+#include <nlohmann/json.hpp>
 
 enum class Buffer {
     Unknown = 0b1,
@@ -38,3 +39,8 @@ const char* priority_to(Priority priority);
 const char* buffer_to(Buffer buffer);
 std::optional<LogcatEntry> try_parse_logcat_entry(char* buf, size_t length, Buffer buffer);
 std::optional<Buffer> try_parse_buffer(char* buf, size_t length);
+
+void from_json(const nlohmann::json& j, Buffer& buffer);
+void to_json(nlohmann::json& j, const Buffer& buffer);
+void from_json(const nlohmann::json& j, Priority& priority);
+void to_json(nlohmann::json& j, const Priority& priority);
diff --git a/main.cpp b/main.cpp
index c311bb9..e96550c 100644
--- a/main.cpp
+++ b/main.cpp
@@ -23,8 +23,6 @@
 int main(int, char**) {
     setlocale(LC_TIME, "");
 
-    // TODO add saving
-    Filters filters;
     Config config;
     try {
         config = load_config();
@@ -164,7 +162,7 @@ int main(int, char**) {
         ImGui_ImplSDL2_NewFrame();
         ImGui::NewFrame();
 
-        event_loop(monospace_font, config, filters, logcat_thread, &run_event_loop);
+        event_loop(monospace_font, config, logcat_thread, &run_event_loop);
 
         // Rendering
         ImGui::Render();
diff --git a/windows/filters.cpp b/windows/filters.cpp
index fbffd15..5b63183 100644
--- a/windows/filters.cpp
+++ b/windows/filters.cpp
@@ -3,6 +3,7 @@
 
 #include "../group_panel.h"
 #include "../filters.h"
+#include "../config.h"
 #include "filters.h"
 
 static inline void render_integer_filter(IntegerFilter* filter);
@@ -13,6 +14,7 @@ static inline void render_group_filter(GroupFilter* filter);
 static std::unique_ptr<Filter> render_add_filter_popup();
 static void update_logcat_entries(const Filters& filters,
         const std::vector<LogcatEntry>& logcat_entries, std::vector<size_t>& filtered_logcat_entry_offsets);
+static void try_write_config(const Config& config);
 
 static void render_filter(Filter* filter, std::string* title, bool* request_removal) {
     ImGui::PushID(filter);
@@ -182,21 +184,21 @@ static inline void render_group_filter(GroupFilter* filter) {
 
 static std::unique_ptr<Filter> render_add_filter_popup() {
     if (ImGui::Selectable("Buffer")) {
-        return std::make_unique<BufferFilter>(0);
+        return std::make_unique<BufferFilter>(0, false);
     } else if (ImGui::Selectable("User")) {
-        return std::make_unique<StringFilter>(FilterKey::User, "");
+        return std::make_unique<StringFilter>(FilterKey::User, "", false, true, false);
     } else if (ImGui::Selectable("PID")) {
-        return std::make_unique<IntegerFilter>(FilterKey::PID, 0);
+        return std::make_unique<IntegerFilter>(FilterKey::PID, 0, false, false);
     } else if (ImGui::Selectable("TID")) {
-        return std::make_unique<IntegerFilter>(FilterKey::TID, 0);
+        return std::make_unique<IntegerFilter>(FilterKey::TID, 0, false, false);
     } else if (ImGui::Selectable("Priority")) {
-        return std::make_unique<PriorityFilter>(0);
+        return std::make_unique<PriorityFilter>(0, false);
     } else if (ImGui::Selectable("Tag")) {
-        return std::make_unique<StringFilter>(FilterKey::Tag, "");
+        return std::make_unique<StringFilter>(FilterKey::Tag, "", false, true, false);
     } else if (ImGui::Selectable("Message")) {
-        return std::make_unique<StringFilter>(FilterKey::Message, "");
+        return std::make_unique<StringFilter>(FilterKey::Message, "", false, true, false);
     } else if (ImGui::Selectable("Group of filters")) {
-        return std::make_unique<GroupFilter>(std::vector<std::unique_ptr<Filter>>(), GroupFilter::Type::All);
+        return std::make_unique<GroupFilter>(std::vector<std::unique_ptr<Filter>>(), GroupFilter::Type::All, false);
     }
 
     return std::unique_ptr<Filter>();
@@ -212,7 +214,15 @@ static void update_logcat_entries(const Filters& filters,
     }
 }
 
-void filters_window(Filters& active_filters, Filters& inactive_filters,
+static void try_write_config(const Config& config) {
+    try {
+        write_config(config);
+    } catch (const std::exception& e) {
+        log(std::string("Failed to write config: ") + e.what());
+    }
+}
+
+void filters_window(Config& active_config, Config& inactive_config,
         const std::vector<LogcatEntry>& logcat_entries, std::vector<size_t>& filtered_logcat_entry_offsets,
         bool* p_open) {
     if (!ImGui::Begin("Filters", p_open)) {
@@ -222,11 +232,11 @@ void filters_window(Filters& active_filters, Filters& inactive_filters,
 
     ImGui::TextUnformatted("You can use regex for strings by prepending \"regex:\"");
 
-    for (Filters::iterator it = inactive_filters.begin(); it != inactive_filters.end();) {
+    for (Filters::iterator it = inactive_config.filters.begin(); it != inactive_config.filters.end();) {
         bool removal_requested = false;
         render_filter(it->second.get(), &it->first, &removal_requested);
         if (removal_requested) {
-            inactive_filters.erase(it);
+            inactive_config.filters.erase(it);
         } else {
             it++;
         }
@@ -238,7 +248,7 @@ void filters_window(Filters& active_filters, Filters& inactive_filters,
     if (ImGui::BeginPopup("addfilter_root")) {
         std::unique_ptr<Filter> added_filter = render_add_filter_popup();
         if (added_filter) {
-            inactive_filters.push_back(std::make_pair("", std::move(added_filter)));
+            inactive_config.filters.push_back(std::make_pair("", std::move(added_filter)));
         }
         ImGui::EndPopup();
     }
@@ -246,8 +256,9 @@ void filters_window(Filters& active_filters, Filters& inactive_filters,
     ImGui::Separator();
     ImVec2 button_size(4 * ImGui::GetFontSize(), 0);
     if (ImGui::Button("OK", button_size)) {
-        active_filters = std::move(inactive_filters);
-        update_logcat_entries(active_filters, logcat_entries, filtered_logcat_entry_offsets);
+        active_config.filters = std::move(inactive_config.filters);
+        try_write_config(active_config);
+        update_logcat_entries(active_config.filters, logcat_entries, filtered_logcat_entry_offsets);
         *p_open = false;
     }
     ImGui::SameLine();
@@ -256,8 +267,9 @@ void filters_window(Filters& active_filters, Filters& inactive_filters,
     }
     ImGui::SameLine();
     if (ImGui::Button("Apply", button_size)) {
-        copy_filters(active_filters, inactive_filters);
-        update_logcat_entries(active_filters, logcat_entries, filtered_logcat_entry_offsets);
+        copy_filters(active_config.filters, inactive_config.filters);
+        try_write_config(active_config);
+        update_logcat_entries(active_config.filters, logcat_entries, filtered_logcat_entry_offsets);
     }
     ImGui::End();
 }
diff --git a/windows/filters.h b/windows/filters.h
index 2183699..823597c 100644
--- a/windows/filters.h
+++ b/windows/filters.h
@@ -3,8 +3,8 @@
 #include <vector>
 
 #include "../logcat_entry.h"
-#include "../filters.h"
+#include "../config.h"
 
-void filters_window(Filters& active_filters, Filters& inactive_filters,
+void filters_window(Config& active_config, Config& inactive_config,
         const std::vector<LogcatEntry>& logcat_entries, std::vector<size_t>& filtered_logcat_entry_offsets,
         bool* p_open);
diff --git a/windows/main.cpp b/windows/main.cpp
index de0408f..64dea2d 100644
--- a/windows/main.cpp
+++ b/windows/main.cpp
@@ -55,7 +55,6 @@ static inline void render_table(ImFont* monospace_font, std::vector<LogcatEntry>
 void main_window(bool latest_log_entries_read, ImFont* monospace_font,
         std::vector<LogcatEntry>& logcat_entries, std::vector<size_t>& filtered_logcat_entry_offsets,
         const Config& active_config, Config& inactive_config,
-        const Filters& active_filters, Filters& inactive_filters,
         bool* show_settings_window, bool* show_filters_window, bool* show_logs_window, bool* run_event_loop) {
 
     ImGui::SetNextWindowPos(ImGui::GetMainViewport()->WorkPos);
@@ -67,13 +66,15 @@ void main_window(bool latest_log_entries_read, ImFont* monospace_font,
     }
 
     if (ImGui::Button("Settings") && !*show_settings_window) {
-        inactive_config = active_config;
+        inactive_config.logcat_command = active_config.logcat_command;
+        inactive_config.normal_font_size = active_config.normal_font_size;
+        inactive_config.monospace_font_size = active_config.monospace_font_size;
         *show_settings_window = true;
     }
 
     ImGui::SameLine();
     if (ImGui::Button("Filters") && !*show_filters_window) {
-        copy_filters(inactive_filters, active_filters);
+        copy_filters(inactive_config.filters, active_config.filters);
         *show_filters_window = true;
     }
 
diff --git a/windows/main.h b/windows/main.h
index 18f168f..e9750e4 100644
--- a/windows/main.h
+++ b/windows/main.h
@@ -4,11 +4,9 @@
 #include <vector>
 
 #include "../config.h"
-#include "../filters.h"
 #include "../logcat_entry.h"
 
 void main_window(bool latest_log_entries_read, ImFont* monospace_font,
         std::vector<LogcatEntry>& logcat_entries, std::vector<size_t>& filtered_logcat_entry_offsets,
         const Config& active_config, Config& inactive_config,
-        const Filters& active_filters, Filters& inactive_filters,
         bool* show_settings_window, bool* show_filters_window, bool* show_logs_window, bool* run_event_loop);
diff --git a/windows/settings.cpp b/windows/settings.cpp
index c1f6d9e..d982914 100644
--- a/windows/settings.cpp
+++ b/windows/settings.cpp
@@ -4,12 +4,11 @@
 #include "../config.h"
 #include "settings.h"
 
-static void write_config_and_update_structures(const Config& config) {
+static void try_write_config(const Config& config) {
     try {
         write_config(config);
     } catch (const std::exception& e) {
         log(std::string("Failed to write config: ") + e.what());
-        return;
     }
 }
 
@@ -31,8 +30,10 @@ void settings_window(Config& active_config, Config& inactive_config, bool* p_ope
     ImGui::Separator();
     ImVec2 button_size(4 * ImGui::GetFontSize(), 0);
     if (ImGui::Button("OK", button_size)) {
-        active_config = std::move(inactive_config);
-        write_config_and_update_structures(active_config);
+        active_config.logcat_command = std::move(inactive_config.logcat_command);
+        active_config.normal_font_size = inactive_config.normal_font_size;
+        active_config.monospace_font_size = inactive_config.monospace_font_size;
+        try_write_config(active_config);
         *p_open = false;
     }
     ImGui::SameLine();
@@ -41,8 +42,10 @@ void settings_window(Config& active_config, Config& inactive_config, bool* p_ope
     }
     ImGui::SameLine();
     if (ImGui::Button("Apply", button_size)) {
-        active_config = inactive_config;
-        write_config_and_update_structures(active_config);
+        active_config.logcat_command = inactive_config.logcat_command;
+        active_config.normal_font_size = inactive_config.normal_font_size;
+        active_config.monospace_font_size = inactive_config.monospace_font_size;
+        try_write_config(active_config);
     }
     ImGui::End();
 }