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diff --git a/cdec_hg_to_json b/cdec_hg_to_json
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+#!/usr/bin/env python2
+
+import cdec
+import sys, argparse
+
+def hg2json(hg, weights):
+  """
+  output a JSON representation of a cdec hypegraph
+  (see http://aclweb.org/aclwiki/index.php?title=Hypergraph_Format )
+  """
+  res = ''
+  res += "{\n"
+  res += '"weights":{'+"\n"
+  a = []
+  for i in weights:
+    a.append( '"%s":%s'%(i[0], i[1]) )
+  res += ", ".join(a)+"\n"
+  res += "},\n"
+  res += '"nodes":'+"\n"
+  res += "[\n"
+  a = []
+  a.append( '{ "label":"root", "cat":"root" }' )
+  for i in hg.nodes:
+    a.append( '{ "label":"%s", "cat":"%s" }'%(i.id, i.cat) )
+  res += ",\n".join(a)+"\n"
+  res += "],\n"
+  res += '"edges":'+"\n"
+  res += "[\n"
+  a = []
+  for i in hg.edges:
+    s = "{"
+    s += '"head":"%s"'%(i.head_node.id)
+    xs = ' "f":{'
+    b = []
+    for j in i.feature_values:
+      b.append( '"%s":%s'%(j[0], j[1]) )
+    xs += ", ".join(b)
+    xs += "},"
+    c = []
+    for j in i.tail_nodes:
+      c.append( '"'+str(j.id)+'"' )
+    if len(c) > 0:
+      s += ', "tails":[ %s ],'%(",".join(c))
+    else:
+      s += ', "tails":[ "root" ],'
+    s += xs
+    s += ' "weight":%s }'%(i.prob)
+    a.append(s)
+  res += ",\n".join(a)+"\n"
+  res += "]\n"
+  res += "}\n"
+  return res
+
+def main():
+  parser = argparse.ArgumentParser(description='get a proper json representation of cdec hypergraphs')
+  parser.add_argument('-c', '--config', required=True, help='decoder configuration')
+  parser.add_argument('-w', '--weights', required=True, help='feature weights')
+  args = parser.parse_args()
+  with open(args.config) as config:
+    config = config.read()
+  decoder = cdec.Decoder(config)
+  decoder.read_weights(args.weights)
+  ins = sys.stdin.readline().strip()
+  hg = decoder.translate(ins)
+
+  sys.stderr.write( "input:\n '%s'\n"%(ins) )
+  sys.stderr.write( "viterbi translation:\n '%s'\n"%(hg.viterbi()) )
+  num_nodes = 0
+  for i in hg.nodes: num_nodes+=1
+  sys.stderr.write( "# nodes = %s\n"%(num_nodes) )
+  num_edges = 0
+  for i in hg.edges: num_edges+=1
+  sys.stderr.write( "# edges = %s\n"%(num_edges) )
+  sys.stderr.write( "viterbi score = %s\n"%(round(hg.viterbi_features().dot(decoder.weights), 2)) )
+
+  print hg2json(hg, decoder.weights)
+
+if __name__=="__main__":
+  main()
+