diff --git a/patacrep/content/__init__.py b/patacrep/content/__init__.py
index 1aaf5043..7cdc7061 100755
--- a/patacrep/content/__init__.py
+++ b/patacrep/content/__init__.py
@@ -136,6 +136,15 @@ class ContentError(SharedError):
             text += ": " + self.message
         return text
 
+    @property
+    def __dict__(self):
+        parent = vars(super())
+        parent.update({
+            'keyword': self.keyword,
+            'message': self.message,
+            })
+        return parent
+
 class ContentList:
     """List of content items"""
 
diff --git a/patacrep/errors.py b/patacrep/errors.py
index 0db5702b..08eebc6a 100644
--- a/patacrep/errors.py
+++ b/patacrep/errors.py
@@ -110,6 +110,14 @@ class SharedError(SongbookError):
     def __str__(self):
         raise NotImplementedError()
 
+    @property
+    def __dict__(self):
+        return {
+            'type': self.__class__.__name__,
+            'message': str(self),
+            'full_message': str(self),
+            }
+
 def notfound(filename, paths, message=None):
     """Return a string saying that file was not found in paths."""
     if message is None:
diff --git a/patacrep/latex/__init__.py b/patacrep/latex/__init__.py
index f1755186..2aae8813 100644
--- a/patacrep/latex/__init__.py
+++ b/patacrep/latex/__init__.py
@@ -95,6 +95,15 @@ class UnknownLanguage(errors.SharedError):
     def __str__(self):
         return self.message
 
+    @property
+    def __dict__(self):
+        parent = vars(super())
+        parent.update({
+            'original': self.original,
+            'fallback': self.fallback,
+            })
+        return parent
+
 def checklanguage(lang):
     """Check that `lang` is a known language.
 
diff --git a/patacrep/songs/errors.py b/patacrep/songs/errors.py
index cee94b65..3a53ba6c 100644
--- a/patacrep/songs/errors.py
+++ b/patacrep/songs/errors.py
@@ -20,6 +20,17 @@ class SongError(SharedError):
             self.song.subpath,
             )
 
+    @property
+    def __dict__(self):
+        parent = vars(super())
+        parent.update({
+            'datadir': self.song.datadir,
+            'subpath': self.song.subpath,
+            'message': self.message,
+            'full_message': str(self),
+            })
+        return parent
+
 class SongSyntaxError(SongError):
     """Syntax error"""
     # pylint: disable=too-few-public-methods
@@ -35,11 +46,29 @@ class SongSyntaxError(SongError):
         else:
             return "{}: {}".format(self._human_song(), self.message)
 
+    @property
+    def __dict__(self):
+        parent = vars(super())
+        if self.line is not None:
+            parent.update({
+                'line': self.line,
+                })
+        return parent
+
 class FileNotFound(SongError):
     """File not found error"""
 
     def __init__(self, song, filename):
         super().__init__(song, "File '{}' not found.".format(filename))
+        self.filename = filename
+
+    @property
+    def __dict__(self):
+        parent = vars(super())
+        parent.update({
+            'filename': self.filename,
+            })
+        return parent
 
 class SongUnknownLanguage(SongError):
     """Song language is not known."""
@@ -48,3 +77,12 @@ class SongUnknownLanguage(SongError):
         super().__init__(song, message)
         self.original = original
         self.fallback = fallback
+
+    @property
+    def __dict__(self):
+        parent = vars(super())
+        parent.update({
+            'original': self.original,
+            'fallback': self.fallback,
+            })
+        return parent