Getting Flask JSON response as an HTML Table?

python json csv flask html-table

14,113

Solution 1

You should write a template for it like Alex Hall said. It won't be hardcoded if you loop through column names. Firstly, you should import render_template.

from flask import Flask, render_template

Then, you need to change your request handler. This allows to render a template 'record.html' with injecting two variables, records and colnames.

@app.route("/GetData")
def GetData():
    df = pd.read_csv("DemoData.csv")
    temp = df.to_dict('records')
    columnNames = df.columns.values
    return render_template('record.html', records=temp, colnames=columnNames)

Check this rendering template guide. You need to create a new folder 'templates/', and you can find 'templates/record.html' below:

<table border="1">
    <thead>
        <tr>
            {% for col in colnames %}
            <th>{{ col }}</th>
            {% endfor %}
        </tr>
    </thead>
    <tbody>
        {% for record in records %}
        <tr>
            {% for col in colnames %}
            <td>{{ record[col] }}</td>
            {% endfor %}
        </tr>
        {% endfor %}
    </tbody>
</table>

To do this dynamically, firstly you should iterate through column names. As Alex Hall said, dict is not ordered so when iterating records, you should also iterate column names, so you can write them in right order.

Solution 2

A really simple hack is read data into a pandas dataframe first, then call .to_html:

import pandas as pd
from flask import Flask, render_template

@app.route("/table-page", methods=['GET'])
def table():

    data_dic = {
        'id': [100, 101, 102],
        'color': ['red', 'blue', 'red']}
    columns = ['id', 'color']
    index = ['a', 'b', 'c']

    df = pd.DataFrame(data_dic, columns=columns, index=index)
    table = df.to_html(index=False)
    
    return render_template(
        "at-leaderboard.html",
        table=table)

Then simply pop the HTML into your template:

<html>
  <body>
    <div>
      {{ table | safe }}
    </div>
  </body>
</html>

14,113

Author by

Carl

Updated on June 08, 2022

Comments

Carl almost 2 years
I was wondering if there might be a way to return my Flask app's response as an HTML table populated by the JSON response key value pairs instead of merely having the entire JSON string on the HTML page?

Below is the code that i have:
```
from flask import Flask
import json, pandas as pd

app = Flask(__name__)

@app.route("/GetData")
def GetData():
    df = pd.read_csv("DemoData.csv")
    temp = df.to_dict('records')
    data = [dict(i) for i in temp]
    return json.dumps(data, indent=4)


if __name__ == "__main__":
    app.run(host='127.0.0.1', port=8000)
```
The code above gives the following response: (URL: "http://127.0.0.1:8000/GetData")

Now what i want is to get the response converted into a table upon entering the aforementioned URL kinda like the CSV file.

Here is a sample of my CSV file:
```
Employee Name,City,Country,Project Assigned
Carl Elias,Passadena,USA,Optical Character Recognition
Amanda Jean Spears,Denver,USA,Linux Kali Security Mods
John Reese,Athens,Greece,Inertial Navigation System
Leslie James,Heartfordshire,United Kingdom,Relay Transmission Optimisation Mods
Patrick Sullivan,London,United Kingdom,Fraud Checking System
Julia Reginald Roberts,Sao Paolo,Brazil,User Authentication System
Michael Bucannan,San Franscisco,USA,Analytics Automation Tool
Jeanine Fitzgerald,Ontario,Canada,CopyChecker
Patricia Sullly,Shanghai,China,Automated Milling Tool
```
- Alex Hall about 6 years
  
  Write a template. flask.pocoo.org/docs/0.12/tutorial/templates
- Carl about 6 years
  
  @AlexHall but wouldn't that restrict me to hardcode html according to the current csv file like wouldn't that require to have an advance knowledge of what are the coloumn names in the csv, isn't there a dynamic way ..
- Carl about 6 years
  
  @AlexHall suppose i change my csv file then wouldn't that create problems while displaying the table because the table would be hard coded to display the previous csv coloumns
- Alex Hall about 6 years
  
  No, df.columns has the CSV columns in order, you can use them in your template.
- Tomalak about 6 years
  
  You can loop over the columns in your CSV (a dict isn't ordered, don't use one for this task) and simply create the HTML for a table, that wouldn't be hard.