Got Failed to decode JSON object when calling a POST request in flask python
I have written a simple REST-ful web server in python with flask following steps in this tutorial; but I've got a problem calling POST request. The code is:
@app.route('/todo/api/v1.0/tasks', methods=['POST'])
def create_task():
if not request.json or not 'title' in request.json:
abort(400)
task = {
'id': tasks[-1]['id'] + 1,
'title': request.json['title'],
'description': request.json.get('description', ""),
'done': False
}
tasks.append(task)
return jsonify({'task': task}), 201
I send a POST request using curl as the example in the above mentioned page:
curl -i -H "Content-Type: application/json" -X POST -d '{"title":"Read a book"}' http://127.0.0.1:5000/todo/api/v1.0/tasks
But I get this error in response:
HTTP/1.0 400 BAD REQUEST
Content-Type: text/html
Content-Length: 187
Server: Werkzeug/0.11.10 Python/2.7.9
Date: Mon, 30 May 2016 09:05:52 GMT
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<title>400 Bad Request</title>
<h1>Bad Request</h1>
<p>Failed to decode JSON object: Expecting value: line 1 column 1 (char 0)</p>
I've tried to debug and I found out in the get_json method, the passed argument has been translated to '\\'{title:Read a book}\\'' as data and request_charset is None; but I have no idea for a solution. Any help?
EDIT 1:
I have tried @domoarrigato's answer and implemented the create_task method as the following:
@app.route('/todo/api/v1.0/tasks', methods=['POST'])
def create_task():
try:
blob = request.get_json(force=True)
except:
abort(400)
if not 'title' in blob:
abort(400)
task = {
'id': tasks[-1]['id'] + 1,
'title': blob['title'],
'description': blob.get('description', ""),
'done': False
}
tasks.append(task)
return jsonify({'task': task}), 201
But this time I got the following error after calling POST via curl:
HTTP/1.0 400 BAD REQUEST
Content-Type: text/html
Content-Length: 192
Server: Werkzeug/0.11.10 Python/2.7.9
Date: Mon, 30 May 2016 10:56:47 GMT
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<title>400 Bad Request</title>
<h1>Bad Request</h1>
<p>The browser (or proxy) sent a request that this server could not understand.</p>
EDIT 2:
To clarify, I should mention that I'm working on a 64-bit version of Microsoft Windows 7 with Python version 2.7 and the latest version of Flask.
Answer
This works in Windows 7 64:
curl -i -H "Content-Type: application/json" -X POST -d "{\"title\":\"Read a book\"}" http://localhost:5000/todo/api/v1.0/tasks
Back slashes and double quotes.