在Flask模板中编码JSON [英] Encoding JSON inside Flask template

问题描述

我想使用json.dumps()在我的应用程序中精美打印 JSON. 目前，我的模板是这样设置的:

I want to use json.dumps() to pretty print JSON inside my app. Currently, my template is set up like this:

<table>
{% for test in list_of_decoded_json %}
    <tr>
        <td><pre>{{ test|safe }}</pre></td>
    </tr>
{% endfor %}
</table>

其中test是解码的JSON字符串.但是，此实现仅将JSON字符串打印在一行中.

Where test is the decoded JSON string. However, this implementation only prints the JSON strings in one line.

知道jinja2不支持模板中的json.dumps()函数，如何获得所需的漂亮印刷版图?

Knowing that jinja2 doesn't support the json.dumps() function in-template, how can I get the pretty printed layout that I want?

推荐答案

您可以创建自己的to_pretty_json过滤器.首先，您必须将json.dumps()包装到一个新函数中，然后将其注册为进阶过滤器:

You can create your own to_pretty_json filter. First of all, you have to wrap json.dumps() into a new function and then register it as jinja filter:

import json

def to_pretty_json(value):
    return json.dumps(value, sort_keys=True,
                      indent=4, separators=(',', ': '))

app.jinja_env.filters['tojson_pretty'] = to_pretty_json

然后在模板中使用它:

<table>
{% for test in list_of_decoded_json %}
    <tr>
        <td><pre>{{ test|tojson_pretty|safe }}</pre></td>
    </tr>
{% endfor %}
</table>

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