how to submit a this form using jquery and json ?

how to submit a this form using jquery and json ?

hi guys please could you help do this i tried to read about jquery , ajax , json but i just got really lost so i am asking for help to guide me to the right way and thank you so much.

what i want to do is this :
take this from in html 

<form method="GET" action="https://exemple.com/api/work.php">
<input type="hidden" name="method" value="link"/>
<input type="text" name="params[login]"  value="ready" />
</br><input type="text" name="params[pass]"  value="download"/></br>
<input type="text" size="80" name="params[link]" placeholder="get ready"/></br>
<input type="submit" formtarget="txt" value="Submit">
</form>
<iframe type="hidden" name="txt"></iframe>

And turn it to this 

<form>
<input type="text" size="80" name="params[link]" placeholder="get ready"/></br>
 <input type="submit" formtarget="txt" value="Submit">
</form>
<iframe type="hidden" name="txt"></iframe>

i want to validate 
- the the first input with name="method" value="link"
-the second input with name="params[login]"  value="ready"
-the third input with name="params[pass]"  value="download" 
to this url https://exemple.com/api/work.php ( this is a different domain "cross domain") with the GET request 

conclusion 

i don't want the visitor the see the url or the 3 inputs they can pnly submit the link they want to check  


thank you so much i hope someone can guide me to the right way i am so lost now