How do you get a query string on Flask

Question

Not obvious from the flask documention on how to get the query string  I am new  looked at the docs  could not find      So   app route       app route   data   def data        query string            return render template  data html

User · Answer

Werkzeug Flask as already parsed everything for you  No need to do the same work again with urlparse   from flask import request   app route       app route   data   def data        query string   request query string     There is it     return render template  data html     The full documentation for the request and response objects is in Werkzeug  http   werkzeug pocoo org docs wrappers

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Every form of the query string retrievable from flask request object as described in O Reilly Flask Web Devleopment   From O Reilly Flask Web Development  and as stated by Manan Gouhari earlier  first you need to import request   from flask import request   request is an object exposed by Flask as a context variable named  you guessed it  request  As its name suggests  it contains all the information that the client included in the HTTP request  This object has many attributes and methods that you can retrieve and call  respectively   You have quite a few request attributes which contain the query string from which to choose  Here I will list every attribute that contains in any way the query string  as well as a description from the O Reilly book of that attribute    First there is args which is  a dictionary with all the arguments passed in the query string of the URL   So if you want the query string parsed into a dictionary  you d do something like this   from flask import request   app route           queryStringDict   request args    As others have pointed out  you can also use  get   lt arg name gt    to get a specific value from the dictionary   Then  there is the form attribute  which does not contain the query string  but which is included in part of another attribute that does include the query string which I will list momentarily  First  though  form is  A dictionary with all the form fields submitted with the request   I say that to say this  there is another dictionary attribute available in the flask request object called values  values is  A dictionary that combines the values in form and args   Retrieving that would look something like this   from flask import request   app route           formFieldsAndQueryStringDict   request values    Again  use  get   lt arg name gt    to get a specific item out of the dictionary   Another option is query string which is  The query string portion of the URL  as a raw binary value   Example of that   from flask import request   app route           queryStringRaw   request query string   Then as an added bonus there is full path which is  The path and query string portions of the URL   Por ejemplo   from flask import request   app route           pathWithQueryString   request full path   And finally  url   The complete URL requested by the client   which includes the query string    from flask import request   app route           pathWithQueryString   request url   Happy hacking

User · Answer

This can be done using request args get    For example if your query string has a field date  it can be accessed using   date   request args get  date     Don t forget to add  request  to list of imports from flask  i e   from flask import request

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The full URL is available as request url  and the query string is available as request query string decode    Here s an example  from flask import request   app route   adhoc test    def adhoc test         return request query string  To access an individual known param passed in the query string  you can use request args get  param    This is the  quot right quot  way to do it  as far as I know  ETA  Before you go further  you should ask yourself why you want the query string  I ve never had to pull in the raw string - Flask has mechanisms for accessing it in an abstracted way  You should use those unless you have a compelling reason not to

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I came here looking for the query string  not how to get values from the query string   request query string returns the URL parameters as raw byte string  Ref 1     Example of using request query string   from flask import Flask  request  app   Flask   name      app route   data   methods   GET    def get query string        return request query string  if   name         main         app run debug True    Output     References    Official API documentation on query string

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from flask import request   app route   data   def data          here we want to get the value of user  i e   user some-value      user   request args get  user

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If the request if GET and we passed some query parameters then    fro enter code here m flask import request  app route       app route   data   def data       if request method     GET           Get the parameters by key       arg1   request args get  arg1         arg2   request args get  arg2           Generate the query string       query string   arg1  0  amp arg2  1   format arg1  arg2        return render template  data html   query string query string

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We can do this by using request query string  Example  Lets consider view py from my script import get url params   app route   web url    methods   get    post    def get url params index        return Response get url params     You also make it more modular by using Flask Blueprints - https   flask palletsprojects com en 1 1 x blueprints  Lets consider first name is being passed as a part of query string  web url  first name john    here is my script py     import required flask packages from flask import request def get url params           you might further need to format the URL params through escape          firstName   request args get  first name        return firstName       As you see this is just a small example - you can fetch multiple values   formate those and use it or pass it onto the template file

User · Answer

Try like this for query string   from flask import Flask  request  app   Flask   name      app route   parameters   methods   GET    def query strings         args1   request args  args1       args2   request args  args2       args3   request args  args3        return     lt h1 gt The Query String are            lt  h1 gt      format args1 args2 args3    if   name         main          app run debug True    Output

[python] How do you get a query string on Flask?

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