The logs from Heat are not very clear in order to debug an error in a template.

2015-04-24 11:25:05.826 60087 DEBUG root [-] JSON response : {"explanation": "The server could not comply with the request since it is either malformed or otherwise incorrect.", "code": 400, "error": {"message": "while parsing a block mapping", "traceback": "  in \"<byte string="">\", line 69, column 3\ndid not find expected key\n  in \"<byte string="">\", line 88, column 4\nTraceback (most recent call last):\n\n  File \"/usr/lib/python2.7/dist-packages/heat/engine/service.py\", line 63, in wrapped\n    return func(self, ctx, *args, **kwargs)\n\n  File \"/usr/lib/python2.7/dist-packages/heat/engine/service.py\", line 524, in create_stack\n    stack.validate()\n\n  File \"/usr/lib/python2.7/dist-packages/heat/engine/parser.py\", line 364, in validate\n    six.text_type(ex)))\n\nStackValidationFailed: while parsing a block mapping\n  in \"<byte string="">\", line 69, column 3\ndid not find expected key\n  in \"<byte string="">\", line 88, column 4\n", "type": "StackValidationFailed"}, "title": "Bad Request"} to_json /usr/lib/python2.7/dist-packages/heat/common/wsgi.py:577

Which are your tips to debug a heat template ?

Thanks