diff --git a/composer.json b/composer.json
index f00bd7f..218d1fa 100644
--- a/composer.json
+++ b/composer.json
@@ -21,6 +21,7 @@
     ],
     "require": {
         "php": "^7.4|^8.0",
+        "ext-json": "*",
         "guzzlehttp/guzzle": "^7.2",
         "illuminate/http": "^8.0",
         "illuminate/support": "^8.0",
diff --git a/src/MessageAccessor.php b/src/MessageAccessor.php
new file mode 100644
index 0000000..7ca8a4d
--- /dev/null
+++ b/src/MessageAccessor.php
@@ -0,0 +1,167 @@
+<?php
+
+namespace Bilfeldt\LaravelHttpClientLogger;
+
+use GuzzleHttp\Psr7\Utils;
+use Illuminate\Support\Arr;
+use Illuminate\Support\Str;
+use Psr\Http\Message\MessageInterface;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\UriInterface;
+
+class MessageAccessor
+{
+    private array $values;
+    private array $queryFilters;
+    private array $headersFilters;
+    private array $jsonFilters;
+    private string $replace;
+
+    public function __construct(
+        array $jsonFilers = [],
+        array $queryFilters = [],
+        array $headersFilters = [],
+        array $values = [],
+        string $replace = '********'
+    ) {
+        $this->values = $values;
+        $this->queryFilters = $queryFilters;
+        $this->headersFilters = $headersFilters;
+        $this->jsonFilters = $jsonFilers;
+        $this->replace = $replace;
+    }
+
+    public function getUri(RequestInterface $request): UriInterface
+    {
+        $uri = $request->getUri();
+        parse_str($uri->getQuery(), $query);
+
+        return $uri
+            ->withUserInfo($this->replace($this->values, $this->replace, $uri->getUserInfo()))
+            ->withHost($this->replace($this->values, $this->replace, $uri->getHost()))
+            ->withPath($this->replace($this->values, $this->replace, $uri->getPath()))
+            ->withQuery(Arr::query($this->replaceParameters($query, $this->queryFilters, $this->values, $this->replace)));
+    }
+
+    public function getBase(RequestInterface $request): string
+    {
+        $uri = $this->getUri($request);
+
+        $base = '';
+        if ($uri->getScheme()) {
+            $base .= $uri->getScheme().'://';
+        }
+        if ($uri->getUserInfo()) {
+            $base .= $uri->getUserInfo().'@';
+        }
+        if ($uri->getHost()) {
+            $base .= $uri->getHost();
+        }
+        if ($uri->getPort()) {
+            $base .= ':'.$uri->getPort();
+        }
+
+        return $base;
+    }
+
+    public function getQuery(RequestInterface $request): array
+    {
+        parse_str($this->getUri($request)->getQuery(), $query);
+
+        return $query;
+    }
+
+    public function getHeaders(MessageInterface $message): array
+    {
+        foreach ($this->headersFilters as $headersFilter) {
+            if ($message->hasHeader($headersFilter)) {
+                $message = $message->withHeader($headersFilter, $this->replace);
+            }
+        }
+
+        // Header filter applied above as this is an array with two layers
+        return $this->replaceParameters($message->getHeaders(), [], $this->values, $this->replace, false);
+    }
+
+    /**
+     * Determine if the request is JSON.
+     *
+     * @see vendor/laravel/framework/src/Illuminate/Http/Client/Request.php
+     *
+     * @param MessageInterface $message
+     *
+     * @return bool
+     */
+    public function isJson(MessageInterface $message): bool
+    {
+        return $message->hasHeader('Content-Type') &&
+            Str::contains($message->getHeaderLine('Content-Type'), 'json');
+    }
+
+    public function getJson(MessageInterface $message): ?array
+    {
+        return $this->replaceParameters(
+            json_decode($message->getBody()->__toString(), true),
+            $this->jsonFilters,
+            $this->values,
+            $this->replace
+        );
+    }
+
+    public function getContent(MessageInterface $message): string
+    {
+        if ($this->isJson($message)) {
+            $body = json_encode($this->getJson($message));
+        } else {
+            $body = $message->getBody()->__toString();
+            foreach ($this->values as $value) {
+                $body = str_replace($value, $this->replace, $body);
+            }
+        }
+
+        return $body;
+    }
+
+    public function filter(MessageInterface $message): MessageInterface
+    {
+        $body = $this->getContent($message);
+
+        foreach ($this->getHeaders($message) as $header => $values) {
+            $message = $message->withHeader($header, $values);
+        }
+
+        return $message->withBody(Utils::streamFor($body));
+    }
+
+    protected function replaceParameters(array $array, array $parameters, array $values, string $replace, $strict = true): array
+    {
+        foreach ($parameters as $parameter) {
+            if (data_get($array, $parameter, null)) {
+                data_set($array, $parameter, $replace);
+            }
+        }
+
+        array_walk_recursive($array, function (&$item) use ($values, $replace, $strict) {
+            foreach ($values as $value) {
+                if (!$strict && str_contains($item, $value)) {
+                    $item = str_replace($value, $replace, $item);
+                } elseif ($strict && $value === $item) {
+                    $item = $replace;
+                }
+            }
+
+            return $item;
+        });
+
+        return $array;
+    }
+
+    protected function replace($search, $replace, ?string $subject): ?string
+    {
+        if (is_null($subject)) {
+            return null;
+        }
+
+        return str_replace($search, $replace, $subject);
+    }
+}
diff --git a/tests/MessageAccessorTest.php b/tests/MessageAccessorTest.php
new file mode 100644
index 0000000..cb11819
--- /dev/null
+++ b/tests/MessageAccessorTest.php
@@ -0,0 +1,157 @@
+<?php
+
+namespace Bilfeldt\LaravelHttpClientLogger\Tests;
+
+use Bilfeldt\LaravelHttpClientLogger\MessageAccessor;
+use GuzzleHttp\Psr7\Message;
+use GuzzleHttp\Psr7\Request;
+use GuzzleHttp\Psr7\Response;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
+
+class MessageAccessorTest extends TestCase
+{
+    public MessageAccessor $messageAccessor;
+    public RequestInterface $request;
+    public ResponseInterface $response;
+
+    public function setUp(): void
+    {
+        parent::setUp();
+
+        $this->messageAccessor = new MessageAccessor(
+            ['data.baz.*.password'],
+            ['search', 'filter.field2'],
+            ['Authorization'],
+            ['secret'],
+        );
+
+        $this->request = new Request(
+            'POST',
+            'https://user:secret@secret.example.com:9000/some-path/secret/should-not-be-removed?test=true&search=foo&filter[field1]=A&filter[field2]=B#anchor',
+            [
+                'Accept'        => 'application/json',
+                'Content-Type'  => 'application/json',
+                'Authorization' => 'Bearer 1234567890',
+            ],
+            json_encode([
+                'data' => [
+                    'foo' => 'bar',
+                    'baz' => [
+                        [
+                            'field_1'  => 'value1',
+                            'field_2'  => 'value2',
+                            'password' => '123456',
+                            'secret'   => 'this is not for everyone',
+                        ],
+                    ],
+                ],
+            ])
+        );
+    }
+
+    public function test_get_uri()
+    {
+        $uri = $this->messageAccessor->getUri($this->request);
+
+        $this->assertEquals('https', $uri->getScheme());
+        $this->assertEquals('user%3A********@********.example.com:9000', $uri->getAuthority());
+        $this->assertEquals('user%3A********', $uri->getUserInfo());
+        $this->assertEquals('********.example.com', $uri->getHost());
+        $this->assertEquals('9000', $uri->getPort());
+        $this->assertEquals('/some-path/********/should-not-be-removed', $uri->getPath());
+        $this->assertEquals('test=true&search=********&filter[field1]=A&filter[field2]=********', urldecode($uri->getQuery()));
+        $this->assertEquals('anchor', $uri->getFragment());
+    }
+
+    public function test_get_base()
+    {
+        $this->assertEquals(
+            'https://user:********@********.example.com:9000',
+            urldecode($this->messageAccessor->getBase($this->request))
+        );
+    }
+
+    public function test_get_query()
+    {
+        $query = $this->messageAccessor->getQuery($this->request);
+
+        $this->assertIsArray($query);
+        $this->assertEquals([
+            'test'   => 'true',
+            'search' => '********',
+            'filter' => [
+                'field1' => 'A',
+                'field2' => '********',
+            ],
+        ], $query);
+    }
+
+    public function test_get_headers()
+    {
+        $headers = $this->messageAccessor->getHeaders($this->request);
+
+        $this->assertIsArray($headers);
+        $this->assertEquals([
+            'Accept'        => ['application/json'],
+            'Content-Type'  => ['application/json'],
+            'Authorization' => ['********'],
+            'Host'          => ['********.example.com:9000'],
+        ], $headers);
+    }
+
+    public function test_is_json()
+    {
+        $this->assertTrue($this->messageAccessor->isJson($this->request));
+        $this->assertFalse($this->messageAccessor->isJson(new Response(200, ['Content-Type' => 'text/html'], '<html></html>')));
+    }
+
+    public function test_get_json()
+    {
+        $json = $this->messageAccessor->getJson($this->request);
+
+        $this->assertIsArray($json);
+        $this->assertEquals([
+            'data' => [
+                'foo' => 'bar',
+                'baz' => [
+                    [
+                        'field_1'  => 'value1',
+                        'field_2'  => 'value2',
+                        'password' => '********',
+                        'secret'   => 'this is not for everyone', // Note that keys are NOT filtered
+                    ],
+                ],
+            ],
+        ], $json);
+    }
+
+    public function test_get_content()
+    {
+        $content = $this->messageAccessor->getContent($this->request);
+
+        $this->assertEquals(json_encode([
+            'data' => [
+                'foo' => 'bar',
+                'baz' => [
+                    [
+                        'field_1'  => 'value1',
+                        'field_2'  => 'value2',
+                        'password' => '********',
+                        'secret'   => 'this is not for everyone', // Note that keys are NOT filtered
+                    ],
+                ],
+            ],
+        ]), $content);
+    }
+
+    public function test_filter()
+    {
+        $request = $this->messageAccessor->filter($this->request);
+
+        // Note that it is required to use double quotes for the Carriage Return (\r) to work and have it on one line to pass on Windows
+        $output = "POST /some-path/secret/should-not-be-removed?test=true&search=foo&filter%5Bfield1%5D=A&filter%5Bfield2%5D=B HTTP/1.1\r\nHost: ********.example.com:9000\r\nAccept: application/json\r\nContent-Type: application/json\r\nAuthorization: ********\r\n\r\n{\"data\":{\"foo\":\"bar\",\"baz\":[{\"field_1\":\"value1\",\"field_2\":\"value2\",\"password\":\"********\",\"secret\":\"this is not for everyone\"}]}}";
+
+        $this->assertEquals($output, Message::toString($request));
+    }
+}