How format special character in formData by nodeJS ?

[ordimans]

I have a problem with encoding on special characters, let me show my code :

I have a node which post request directly on website, so i use FormData object to build form data.

The request did by a browser (got the CURL) : In all example, it's a sample of my data where i have the problem.

      $'-----------------------------1755811723502268269588155\r\n
    Content-Disposition: form-data; name="pageId"\r\n\r\n212403390500\r\n-----------------------------1755811723502268269588155\r\n
    Content-Disposition: form-data; name="CL_TEXT_CLOT"\r\n\r\nLa t\xe2che \xe9tait bloqu\xe9\r\n-----------------------------1755811723502268269588155\r\n

the code is :

    const form = new FormData();
      form.append('pageId', pageId),
      form.append('pageId', pageId),
      form.append('CL_TEXT_CLOT',el.CL_TEXT_CLOT)
    ...

    let configPost = {
    method: 'POST',
    headers : {'Accept': "text/html,application/xhtml+xml,application/xml;q=0.9,/*;q=0.8",
    'Content-Type': 'multipart/form-data; boundary='+form._boundary,
    'User-Agent' : 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.9 Safari/537.36'},
    url: 'http://localhost:7000/test',
    data : form,
    validateStatus: function (status) {
      return status >= 200 && status < 300 || status == 302; // default
    }

When i sent :

    '----------------------------397600554882409697883429\r\nContent-Disposition: form-data; name="CL_TEXT_CLOT"\r\ntype: text/plain; charset=UTF-8\r\n\r\n',
     'La tâche était bloqué.',

   

If i use escapeUnicode function :

    let escapeUnicode = function (str) {
      return str.replace(/[^\0-~]/g, function(ch) {
          let tmp = "\\u" + ("000" + ch.charCodeAt().toString(16)).slice(-4);
          return tmp.replace('\\u00','\\x')
      });
    }

in the formData, same code but with this line :

form.append('CL_TEXT_CLOT', escapeUnicode(el.CL_TEXT_CLOT))

and the result is :

       '----------------------------882802935214785196311782\r\nContent-Disposition: form-data; name="CL_TEXT_CLOT"\r\ntype: text/plain; charset=UTF-8\r\n\r\n',
         'La t\\xe2che \\xe9tait bloqu\\xe9.',

formData encapsulate the \xe2 by \ so result is \xe2....

and the final code is this (with or without the escapeUnicode) :

     const form = new FormData();
     form.append('CL_TEXT_CLOT', escapeUnicode(el.CL_TEXT_CLOT),{ header: { type:  'text/plain; charset=UTF-8' } })
      

Do you have an idea ? Maybe i am in the wrong way....

EDIT: I have the same program in Python, and i had this in data : <MultipartEncoder: [('CL_TEXT_CLOT', 'The ticket is clos\xe9d.'), ('actionClose', 'Clore'),]> So how should i do to have special character escaped in the formData in nodeJS ???