getting json dictionary values, though python and jinja

Question

I have a dictionary in json that Im passing though into jinja using python. The page is not working not sure if this is the correct syntax

{% with open(jsonobject, 'r') as f
   json_data = json.load(f)
   for a, (b,c) in json_data.items() %}

--------------EDIT----------- This is a large dictionary within the json object being passed int which looks something like this

{"Dogs": [["spot"], 1], "Cats": [["whiskers"], 1], "fish": [["bubbles", "lefty", "tank", "goldie"], 4], "elephant": [["tiny", "spring"], 2], "zebra": [[], 1], "gazelle": [["red", "blue", "green", "yellow", "gold", "silver"], 6]}

can you provide the error you're getting. at the very least, you're missing a color after f. and the for loop syntax is incorrect — Garrett R, Jan 22 '16 at 22:33

score 2 · Answer 1 · answered Jan 22 '16 at 22:41

You should better decode JSON to python dictionary in view function and pass it into jinja:

import json

@app.route("/something")
def something():
    with open('myfile.json', 'r') as f:
        json_data = json.loads(f.read())
    return render_template("something.html", json_data=json_data)

something.html:

<dl>
{% for key, value in json_data.iteritems() %}
    <dt>{{ key|e }}</dt>
    <dd>{{ value|e }}</dd>
{% endfor %}
</dl>

score 1 · Answer 2 · answered Jan 24 '16 at 11:32

If your goal is to print a pretty json string then it might be better to prepare the actual string before passing it to jinja.

In the view you can do this:

import json

@app.route("/something")
def something():
    with open('myfile.json', 'r') as f:
        json_data = json.loads(f.read())
        formatted_json = json.dumps(
            json_data,
            sort_keys=True,
            indent=4,
            separators=(',', ': '))
    return render_template("something.html", json=formatted_json)

And in your something.html you simply print that already formatted variable:

{{ json }}

You can read more about the json string formatting in the documentation section about "pretty printing"

getting json dictionary values, though python and jinja

2 Answers2