Flask: jsonify a Decimal

[michaelfillier]

Currently getting a TypeError: Decimal('0.10') is not JSON serializable error when, you guessed it, I try to encode a Decimal.

I found an accepted fix here: http://stackoverflow.com/questions/4019856/decimal-to-json, but not sure where I should be implementing that within Flask. I tried it within my main app file, but it doesn't appear to be working.

[michaelfillier]

I should add that I have simply been converting the Decimal with str(Decimal) before passing it into jsonify and that is currently working, but it's ugly.

[chason]

If you use simplejson, it includes Decimal encoding by default.

[michaelfillier]

I will try that instead of jsonify. Is there anything jsonify does that is specifically beneficial vs simplejson?

[chason]

If you install the simplejson package, flask.jsonify will automatically use
that instead of the stdlib json library.

On Wed, Aug 14, 2013 at 3:54 PM, michaelfillier [email protected]:

I will try that instead of jsonify. Is there anything jsonify does that is
specifically beneficial vs simplejson?

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Reply to this email directly or view it on GitHubhttps://github.com/mitsuhiko/flask/issues/835#issuecomment-22673774
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[michaelfillier]

Oh, that's great! Thanks.

[mrwillis]

I will add that simplejson does not do datetime objects, while the default JSONEncoder does.

[davidism]

@mrwillis Flask's json encoder uses simplejson when available. If something is not working, please report a new issue with an example.

[kennethreitz42]

I ran into this today

[kennethreitz42]

$ pipenv install simplejson fixed :)

[davidism]

To further extend it, you can override Flask.json_encoder with your own subclass that handles more types.