Add compact JSON logging option to talker_dio_logger

packages/talker/lib/src/utils/json_formatter.dart

@@ -1,34 +1,44 @@
 import 'dart:convert';
 
+const _compactEncoder = JsonEncoder();
 const _defaultEncoder = JsonEncoder.withIndent('  ');
 
 /// Formatter for converting data to pretty JSON strings.
 ///
 /// Use `const TalkerJsonFormatter()` for standard JSON formatting,
+/// `TalkerJsonFormatter(prettyPrint: false)` for compact single-line JSON,
 /// `TalkerJsonFormatter(stripQuotes: true)` to strip quotes,
 /// or `TalkerJsonFormatter.custom(fn)` for custom formatting.
 class TalkerJsonFormatter {
-  /// Creates a formatter with optional quote stripping.
+  /// Creates a formatter with optional quote stripping and pretty printing.
   ///
   /// If [stripQuotes] is true, double quotes will be stripped from
   /// the JSON output (except escaped quotes within values).
-  const TalkerJsonFormatter({this.stripQuotes = false})
-      : _customFormatter = null;
+  const TalkerJsonFormatter({
+    this.stripQuotes = false,
+    this.prettyPrint = true,
+  }) : _customFormatter = null;
 
   /// Creates a formatter with a custom formatting function.
-  const TalkerJsonFormatter.custom(this._customFormatter) : stripQuotes = false;
+  const TalkerJsonFormatter.custom(this._customFormatter)
+      : stripQuotes = false,
+        prettyPrint = true;
 
   /// Whether to strip double quotes from JSON output.
   final bool stripQuotes;
 
+  /// Whether to format JSON with indentation.
+  final bool prettyPrint;
+
   final String Function(dynamic data)? _customFormatter;
 
   /// Formats the given data to a pretty JSON string.
   String format(dynamic data) {
     if (_customFormatter != null) {
       return _customFormatter!(data);
     }
-    final json = _defaultEncoder.convert(data);
+    final json =
+        (prettyPrint ? _defaultEncoder : _compactEncoder).convert(data);
     if (stripQuotes) {
       // Use \x00 (null byte) as a temporary placeholder for escaped quotes.
       // This is safe because JsonEncoder escapes control characters (U+0000-U+001F)

packages/talker/test/json_formatter_test.dart

@@ -31,6 +31,14 @@ void main() {
         expect(result, contains('2'));
         expect(result, contains('3'));
       });
+
+      test('formats single-line JSON when prettyPrint is false', () {
+        const formatter = TalkerJsonFormatter(prettyPrint: false);
+        final result = formatter.format({'name': 'John', 'age': 30});
+
+        expect(result, equals('{"name":"John","age":30}'));
+        expect(result, isNot(contains('\n')));
+      });
     });
 
     group('stripQuotes', () {
@@ -96,6 +104,7 @@ void main() {
         final formatter = TalkerJsonFormatter.custom((data) => 'CUSTOM: $data');
 
         expect(formatter.stripQuotes, isFalse);
+        expect(formatter.prettyPrint, isTrue);
       });
     });
 

packages/talker_dio_logger/README.md

@@ -104,6 +104,16 @@ TalkerDioLoggerSettings(
 )
 ```
 
+### Log JSON in a single line
+
+If you need copy-friendly JSON output, disable pretty printing in the formatter.
+
+```dart
+TalkerDioLoggerSettings(
+  jsonFormatter: const TalkerJsonFormatter(prettyPrint: false),
+)
+```
+
 ## Using with Talker
 You can add your talker instance for TalkerDioLogger if your app already uses Talker.
 In this case, all logs and errors will fall into your unified tracking system
@@ -118,4 +128,3 @@ dio.interceptors.add(TalkerDioLogger(talker: talker));
 ## Additional information
 The project is under development and ready for your pull-requests and issues 👍<br>
 Thank you for support ❤️
-

packages/talker_dio_logger/lib/talker_dio_logger_settings.dart

@@ -110,6 +110,7 @@ class TalkerDioLoggerSettings {
 
   /// JSON formatter for converting data to pretty string.
   /// Use [TalkerJsonFormatter] for default formatting,
+  /// [TalkerJsonFormatter(prettyPrint: false)] for single-line JSON,
   /// [TalkerJsonFormatter(stripQuotes: true)] to strip quotes,
   /// or [TalkerJsonFormatter.custom(fn)] for custom formatting.
   final TalkerJsonFormatter jsonFormatter;

packages/talker_dio_logger/test/logs_test.dart

@@ -632,6 +632,33 @@ void main() {
       expect(result, contains('Data: CUSTOM:{key: value}'));
     });
 
+    test('generateTextMessage should support single-line JSON formatting', () {
+      final response = Response(
+        requestOptions: RequestOptions(path: '/test', method: 'GET'),
+        statusCode: 200,
+        data: {
+          'key': 'value',
+          'nested': {'id': 1}
+        },
+      );
+      final settings = TalkerDioLoggerSettings(
+        jsonFormatter: TalkerJsonFormatter(prettyPrint: false),
+      );
+      final dioResponseLog = DioResponseLog(
+        'Test message',
+        response: response,
+        settings: settings,
+      );
+
+      final result = dioResponseLog.generateTextMessage();
+
+      expect(
+        result,
+        contains('Data: {"key":"value","nested":{"id":1}}'),
+      );
+      expect(result, isNot(contains('\n  "key"')));
+    });
+
     test('generateTextMessage should strip quotes in headers', () {
       final response = Response(
         requestOptions: RequestOptions(path: '/test', method: 'GET'),