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Jinja2 - How to encode a json list?

How can I loop a json list with jinja2?

I have this JSON list,

[ { "first_name": "John", "last_name": "Smith", "user_id": 4, "address": null }, { "first_name": "Jane", "last_name": "Heart", "user_id": 5, "address": null }, { "first_name": "Dom", "last_name": "Robinsons", "user_id": 6, "address": null }, { "first_name": "Pete", "last_name": "Hand", "user_id": 7, "address": null } ]

page.html,

 <table> {% for user in users %} <tr><td>{{ user.first_name }}</td></tr> {% endfor %} </table>

Result,

 <table> <tr><td></td></tr> <tr><td></td></tr> <tr><td></td></tr> <tr><td></td></tr> ...

Any ideas?

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2 answers

your json list contains dictionaries; You need to access vocabulary elements differently than class members; try:

 <tr><td>{{ user['first_name'] }}</td></tr>

this works for me (python 3.4 and python 2.7)

 import json from jinja2 import Template json_str = '''[{"first_name": "John", "last_name": "Smith", "user_id": 4, "address": null}, {"first_name": "Jane", "last_name": "Heart", "user_id": 5, "address": null}, {"first_name": "Dom", "last_name": "Robinsons", "user_id": 6, "address": null}, {"first_name": "Pete", "last_name": "Hand", "user_id": 7, "address": null}]''' users = json.loads(json_str) tmpl = Template(''' <table> {% for user in users %} <tr><td>{{ user['first_name'] }}</td></tr> {% endfor %} </table> ''') print(tmpl.render(users = users))

output:

 <table> <tr><td>John</td></tr> <tr><td>Jane</td></tr> <tr><td>Dom</td></tr> <tr><td>Pete</td></tr> </table>
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simple json iteration in jinja2

 <table> <tr> {% for key in users[0] %} <th>{{ key }}</th> {% endfor %} </tr> {% for user in users %} <tr> {% for key in user %} <td>{{ user[key] }}</td> {% endfor %} </tr> {% endfor %} </table>
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