Joomla JRequest & Input changes: Joomla 3 → 4, 5 and 6

9 issues in this guide

Request handling is the other Class not found pair alongside JFactory. This guide groups 9 entries: JFilterInput, JFilterOutput, JInput, JInputCli, JInputCookie, JInputFiles, JInputJSON, JRequest::getVar(), JRequest::getInt(). JRequest::getVar / getInt were removed for Joomla 4; JInput and cookie/files/JSON/CLI input classes remain as aliases through Joomla 5 and disappear on native Joomla 6. InputFilter and OutputFilter follow the same alias story. The replacement pattern is Application-centric: $app = Factory::getApplication(); $input = $app->getInput(); then typed getters instead of JRequest statics. Import Joomla\CMS\Filter\InputFilter / OutputFilter — do not keep JFilter* globals. Hop mix: 2 at Joomla 3 → 4; 7 at Joomla 5 → 6. Because JRequest is already dead on Joomla 4, fix those calls first, then clear remaining JInput / JFilter* hits with the BC plugin off before Joomla 6. Catalog replacements in this guide include JFilterInput → Joomla\CMS\Filter\InputFilter; JFilterOutput → Joomla\CMS\Filter\OutputFilter; JInput → Joomla\CMS\Input\Input; JInputCli → Joomla\CMS\Input\Cli. Open each h2 anchor for the full before/after, fix list, and error strings shipped in the reference data.

JFILTERINPUT-CLASS-001

JFilterInput

JFilterInput class name

JFilterInput is a Joomla 3 global class. Joomla 4 still has an alias. Joomla 5 needs the Behaviour – Backward Compatibility plugin. Native Joomla 6 does not load that alias — you get Class "JFilterInput" not found.

JFilterInput → Joomla\CMS\Filter\InputFilter

Dies at Joomla 5 → 6
Dies at Joomla 5 → 6J3: Works nativelyJ4: Alias (old name still resolves)J6: Removed — fatalBC plugin: covers the class nameMechanical renameJoomla API

What you will see

  • Class "JFilterInput" not found
  • Class 'JFilterInput' not found
  • Failed to open stream: JFilterInput

Symptoms people search

white screen after disabling compatibility plugin · class not found on Joomla 6 · works on Joomla 5 until I turn off backward compatibility

Replace this code

Swap JFilterInput for Joomla\CMS\Filter\InputFilter.

Joomla 3

Remove or stop calling this

JFilterInput::getInstance();
// or new JFilterInput()

Joomla 4 / 6

Use this instead

use Joomla\CMS\Filter\InputFilter;

// Call the namespaced class. Do not keep the J prefix.

How to fix it

  1. 1Add a use statement for Joomla\CMS\Filter\InputFilter.
  2. 2Replace every JFilterInput with the short class name from that use line.
  3. 3Disable Behaviour – Backward Compatibility on a Joomla 5 staging site. If it fatals, this class is still in the code.

Also known as

JFilterInput · Joomla\CMS\Filter\InputFilter · class alias · J prefix

Scan a ZIP for thisAsk Infyways to fix it

JFILTEROUTPUT-CLASS-001

JFilterOutput

JFilterOutput class name

JFilterOutput is a Joomla 3 global class. Joomla 4 still has an alias. Joomla 5 needs the Behaviour – Backward Compatibility plugin. Native Joomla 6 does not load that alias — you get Class "JFilterOutput" not found.

JFilterOutput → Joomla\CMS\Filter\OutputFilter

Dies at Joomla 5 → 6
Dies at Joomla 5 → 6J3: Works nativelyJ4: Alias (old name still resolves)J6: Removed — fatalBC plugin: covers the class nameMechanical renameJoomla API

What you will see

  • Class "JFilterOutput" not found
  • Class 'JFilterOutput' not found
  • Failed to open stream: JFilterOutput

Symptoms people search

white screen after disabling compatibility plugin · class not found on Joomla 6 · works on Joomla 5 until I turn off backward compatibility

Replace this code

Swap JFilterOutput for Joomla\CMS\Filter\OutputFilter.

Joomla 3

Remove or stop calling this

JFilterOutput::getInstance();
// or new JFilterOutput()

Joomla 4 / 6

Use this instead

use Joomla\CMS\Filter\OutputFilter;

// Call the namespaced class. Do not keep the J prefix.

How to fix it

  1. 1Add a use statement for Joomla\CMS\Filter\OutputFilter.
  2. 2Replace every JFilterOutput with the short class name from that use line.
  3. 3Disable Behaviour – Backward Compatibility on a Joomla 5 staging site. If it fatals, this class is still in the code.

Also known as

JFilterOutput · Joomla\CMS\Filter\OutputFilter · class alias · J prefix

Scan a ZIP for thisAsk Infyways to fix it

JINPUT-CLASS-001

JInput

JInput class name

JInput is a Joomla 3 global class. Joomla 4 still has an alias. Joomla 5 needs the Behaviour – Backward Compatibility plugin. Native Joomla 6 does not load that alias — you get Class "JInput" not found.

JInput → Joomla\CMS\Input\Input

Dies at Joomla 5 → 6
Dies at Joomla 5 → 6J3: Works nativelyJ4: Alias (old name still resolves)J6: Removed — fatalBC plugin: covers the class nameMechanical renameJoomla API

What you will see

  • Class "JInput" not found
  • Class 'JInput' not found
  • Failed to open stream: JInput

Symptoms people search

white screen after disabling compatibility plugin · class not found on Joomla 6 · works on Joomla 5 until I turn off backward compatibility

Replace this code

Swap JInput for Joomla\CMS\Input\Input.

Joomla 3

Remove or stop calling this

JInput::getInstance();
// or new JInput()

Joomla 4 / 6

Use this instead

use Joomla\CMS\Input\Input;

// Call the namespaced class. Do not keep the J prefix.

How to fix it

  1. 1Add a use statement for Joomla\CMS\Input\Input.
  2. 2Replace every JInput with the short class name from that use line.
  3. 3Disable Behaviour – Backward Compatibility on a Joomla 5 staging site. If it fatals, this class is still in the code.

Also known as

JInput · Joomla\CMS\Input\Input · class alias · J prefix

Scan a ZIP for thisAsk Infyways to fix it

JINPUTCLI-CLASS-001

JInputCli

JInputCli class name

JInputCli is a Joomla 3 global class. Joomla 4 still has an alias. Joomla 5 needs the Behaviour – Backward Compatibility plugin. Native Joomla 6 does not load that alias — you get Class "JInputCli" not found.

JInputCli → Joomla\CMS\Input\Cli

Dies at Joomla 5 → 6
Dies at Joomla 5 → 6J3: Works nativelyJ4: Alias (old name still resolves)J6: Removed — fatalBC plugin: covers the class nameMechanical renameJoomla API

What you will see

  • Class "JInputCli" not found
  • Class 'JInputCli' not found
  • Failed to open stream: JInputCli

Symptoms people search

white screen after disabling compatibility plugin · class not found on Joomla 6 · works on Joomla 5 until I turn off backward compatibility

Replace this code

Swap JInputCli for Joomla\CMS\Input\Cli.

Joomla 3

Remove or stop calling this

JInputCli::getInstance();
// or new JInputCli()

Joomla 4 / 6

Use this instead

use Joomla\CMS\Input\Cli;

// Call the namespaced class. Do not keep the J prefix.

How to fix it

  1. 1Add a use statement for Joomla\CMS\Input\Cli.
  2. 2Replace every JInputCli with the short class name from that use line.
  3. 3Disable Behaviour – Backward Compatibility on a Joomla 5 staging site. If it fatals, this class is still in the code.

Also known as

JInputCli · Joomla\CMS\Input\Cli · class alias · J prefix

Scan a ZIP for thisAsk Infyways to fix it

JINPUTCOOKIE-CLASS-001

JInputCookie

JInputCookie class name

JInputCookie is a Joomla 3 global class. Joomla 4 still has an alias. Joomla 5 needs the Behaviour – Backward Compatibility plugin. Native Joomla 6 does not load that alias — you get Class "JInputCookie" not found.

JInputCookie → Joomla\CMS\Input\Cookie

Dies at Joomla 5 → 6
Dies at Joomla 5 → 6J3: Works nativelyJ4: Alias (old name still resolves)J6: Removed — fatalBC plugin: covers the class nameMechanical renameJoomla API

What you will see

  • Class "JInputCookie" not found
  • Class 'JInputCookie' not found
  • Failed to open stream: JInputCookie

Symptoms people search

white screen after disabling compatibility plugin · class not found on Joomla 6 · works on Joomla 5 until I turn off backward compatibility

Replace this code

Swap JInputCookie for Joomla\CMS\Input\Cookie.

Joomla 3

Remove or stop calling this

JInputCookie::getInstance();
// or new JInputCookie()

Joomla 4 / 6

Use this instead

use Joomla\CMS\Input\Cookie;

// Call the namespaced class. Do not keep the J prefix.

How to fix it

  1. 1Add a use statement for Joomla\CMS\Input\Cookie.
  2. 2Replace every JInputCookie with the short class name from that use line.
  3. 3Disable Behaviour – Backward Compatibility on a Joomla 5 staging site. If it fatals, this class is still in the code.

Also known as

JInputCookie · Joomla\CMS\Input\Cookie · class alias · J prefix

Scan a ZIP for thisAsk Infyways to fix it

JINPUTFILES-CLASS-001

JInputFiles

JInputFiles class name

JInputFiles is a Joomla 3 global class. Joomla 4 still has an alias. Joomla 5 needs the Behaviour – Backward Compatibility plugin. Native Joomla 6 does not load that alias — you get Class "JInputFiles" not found.

JInputFiles → Joomla\CMS\Input\Files

Dies at Joomla 5 → 6
Dies at Joomla 5 → 6J3: Works nativelyJ4: Alias (old name still resolves)J6: Removed — fatalBC plugin: covers the class nameMechanical renameJoomla API

What you will see

  • Class "JInputFiles" not found
  • Class 'JInputFiles' not found
  • Failed to open stream: JInputFiles

Symptoms people search

white screen after disabling compatibility plugin · class not found on Joomla 6 · works on Joomla 5 until I turn off backward compatibility

Replace this code

Swap JInputFiles for Joomla\CMS\Input\Files.

Joomla 3

Remove or stop calling this

JInputFiles::getInstance();
// or new JInputFiles()

Joomla 4 / 6

Use this instead

use Joomla\CMS\Input\Files;

// Call the namespaced class. Do not keep the J prefix.

How to fix it

  1. 1Add a use statement for Joomla\CMS\Input\Files.
  2. 2Replace every JInputFiles with the short class name from that use line.
  3. 3Disable Behaviour – Backward Compatibility on a Joomla 5 staging site. If it fatals, this class is still in the code.

Also known as

JInputFiles · Joomla\CMS\Input\Files · class alias · J prefix

Scan a ZIP for thisAsk Infyways to fix it

JINPUTJSON-CLASS-001

JInputJSON

JInputJSON class name

JInputJSON is a Joomla 3 global class. Joomla 4 still has an alias. Joomla 5 needs the Behaviour – Backward Compatibility plugin. Native Joomla 6 does not load that alias — you get Class "JInputJSON" not found.

JInputJSON → Joomla\CMS\Input\Json

Dies at Joomla 5 → 6
Dies at Joomla 5 → 6J3: Works nativelyJ4: Alias (old name still resolves)J6: Removed — fatalBC plugin: covers the class nameMechanical renameJoomla API

What you will see

  • Class "JInputJSON" not found
  • Class 'JInputJSON' not found
  • Failed to open stream: JInputJSON

Symptoms people search

white screen after disabling compatibility plugin · class not found on Joomla 6 · works on Joomla 5 until I turn off backward compatibility

Replace this code

Swap JInputJSON for Joomla\CMS\Input\Json.

Joomla 3

Remove or stop calling this

JInputJSON::getInstance();
// or new JInputJSON()

Joomla 4 / 6

Use this instead

use Joomla\CMS\Input\Json;

// Call the namespaced class. Do not keep the J prefix.

How to fix it

  1. 1Add a use statement for Joomla\CMS\Input\Json.
  2. 2Replace every JInputJSON with the short class name from that use line.
  3. 3Disable Behaviour – Backward Compatibility on a Joomla 5 staging site. If it fatals, this class is still in the code.

Also known as

JInputJSON · Joomla\CMS\Input\Json · class alias · J prefix · JInputJson

Scan a ZIP for thisAsk Infyways to fix it

JREQUEST-GETVAR-001

JRequest::getVar()

JRequest::getVar() and the whole JRequest API

Joomla removed the global request object. There is no class alias and the compatibility plugin does not bring JRequest back. This dies on the first Joomla 4 boot.

JRequest::getVar() → $app->getInput()->get('id')

Dies at Joomla 3 → 4
Dies at Joomla 3 → 4J3: Works nativelyJ4: Removed — fatalJ6: Removed — fatalBC plugin: no — already dead on J4Patch possible — review itJoomla API

What you will see

  • Class "JRequest" not found
  • Call to undefined method JRequest::getVar
  • Call to undefined method JRequest::getInt

Symptoms people search

site dies immediately after Joomla 4 upgrade · component 500 on every page · getVar not found

Replace this code

Swap JRequest::getVar() for $app->getInput()->get('id').

Joomla 3

Remove or stop calling this

$id = JRequest::getVar('id');
$cid = JRequest::getInt('cid');

Joomla 4 / 6

Use this instead

use Joomla\CMS\Factory;

$app = Factory::getApplication();
$input = $app->getInput();
$id = $input->get('id', 0, 'INT');

How to fix it

  1. 1Get the application, then $app->getInput().
  2. 2Replace getVar/getInt/getCmd with Input::get() and a filter (INT, CMD, STRING).
  3. 3Search the whole ZIP for JRequest — every call is a Joomla 4 blocker.

Also known as

JRequest · getVar · getInt · getCmd · JRequest::get

Scan a ZIP for thisAsk Infyways to fix it

JREQUEST-MEMBERS-001

JRequest::getInt()

JRequest::getInt / getCmd / getWord / get / set / getMethod

The entire JRequest API died with the class. People search getInt even when they already know getVar is dead.

JRequest::getInt() → $app->getInput()->get('x', 0, 'INT')

Dies at Joomla 3 → 4
Dies at Joomla 3 → 4J3: Works nativelyJ4: Removed — fatalJ6: Removed — fatalBC plugin: no — already dead on J4Patch possible — review itJoomla API

What you will see

  • Call to undefined method JRequest::getInt
  • Call to undefined method JRequest::getCmd
  • Call to undefined method JRequest::getWord
  • Call to undefined method JRequest::getMethod
  • Call to undefined method JRequest::setVar

Symptoms people search

getInt not found · getCmd · getWord · JRequest::get(

Replace this code

Swap JRequest::getInt() for $app->getInput()->get('x', 0, 'INT').

Joomla 3

Remove or stop calling this

$id = JRequest::getInt('id');
$task = JRequest::getCmd('task');
$word = JRequest::getWord('layout');
$all = JRequest::get('post');
JRequest::setVar('id', 1);
$method = JRequest::getMethod();

Joomla 4 / 6

Use this instead

$input = Factory::getApplication()->getInput();
$id = $input->getInt('id');
$task = $input->getCmd('task');
$word = $input->getWord('layout');
$post = $input->post->getArray();
$input->set('id', 1);
$method = $input->getMethod();

How to fix it

  1. 1Same as JRequest::getVar: use Input.
  2. 2Map getInt→getInt, getCmd→getCmd, getWord→getWord.

Also known as

getInt · getCmd · getWord · getFloat · getBool · getString · setVar · getMethod · JRequest::get

Scan a ZIP for thisAsk Infyways to fix it

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