diff --git a/grumphp.yml b/grumphp.yml
index 26082d2..ebda291 100644
--- a/grumphp.yml
+++ b/grumphp.yml
@@ -6,7 +6,9 @@ grumphp:
   tasks:
     phplint: ~
     yamllint: ~
-    jsonlint: ~
+    jsonlint:
+      ignore_patterns:
+        - /^tests\/fixtures\/invalid\.json/
     composer: ~
     composer_normalize: ~
     phpcs: ~
diff --git a/src/Environment.php b/src/Environment.php
index d3cd97d..96aa170 100644
--- a/src/Environment.php
+++ b/src/Environment.php
@@ -319,4 +319,40 @@ protected static function redirect(string $url, int $code = 301): never
         header('Location: ' . $url);
         exit;
     }
+
+    /**
+     * Process a file that contains environment variables to the current environment.
+     *
+     * @param string $file
+     *   The path to the JSON file.
+     *
+     * @throws \RuntimeException
+     *   If the file does not exist or is not readable.
+     * @throws \JsonException
+     *   If the file contents is not valid JSON.
+     */
+    public static function processEnvironmentFileJson(string $file): void
+    {
+        if (!is_file($file) || !is_readable($file)) {
+            throw new \RuntimeException("Environment file $file does not exist or is not readable.");
+        }
+
+        $contents = @file_get_contents($file);
+        if ($contents === false) {
+            throw new \RuntimeException("Environment file $file was unable to be read.");
+        }
+
+        // The depth is set intentionally low because we do not expect deeply
+        // nested JSON.
+        $values = json_decode($contents, true, 2, JSON_THROW_ON_ERROR);
+
+        // We only support key value secrets that are strings.
+        $values = array_filter($values, static function ($value, $key) {
+            return is_string($key) && is_string($value);
+        }, ARRAY_FILTER_USE_BOTH);
+
+        foreach ($values as $name => $value) {
+            static::set($name, $value);
+        }
+    }
 }
diff --git a/tests/fixtures/invalid.json b/tests/fixtures/invalid.json
new file mode 100644
index 0000000..6920164
--- /dev/null
+++ b/tests/fixtures/invalid.json
@@ -0,0 +1 @@
+this is an invalid json file
diff --git a/tests/fixtures/nested.json b/tests/fixtures/nested.json
new file mode 100644
index 0000000..d56dd09
--- /dev/null
+++ b/tests/fixtures/nested.json
@@ -0,0 +1,5 @@
+{
+    "first_level": {
+        "second_level": "second_level_value"
+    }
+}
diff --git a/tests/fixtures/valid.json b/tests/fixtures/valid.json
new file mode 100644
index 0000000..5c10941
--- /dev/null
+++ b/tests/fixtures/valid.json
@@ -0,0 +1,5 @@
+{
+    "JSON_UPPER_KEY": "upper",
+    "json_lower_key": "lower",
+    "invalid_value": 1
+}
diff --git a/tests/src/EnvironmentTest.php b/tests/src/EnvironmentTest.php
index f8c6f67..19013dd 100644
--- a/tests/src/EnvironmentTest.php
+++ b/tests/src/EnvironmentTest.php
@@ -610,4 +610,54 @@ public static function providerEnvironment(): array
             ],
         ];
     }
+
+    /**
+     * Test processing JSON files into environment variables.
+     *
+     * @dataProvider providerProcessEnvironmentFileJson
+     */
+    #[DataProvider('providerProcessEnvironmentFileJson')]
+    public function testProcessEnvironmentFileJson(string $file, array|string $expectedValues): void
+    {
+        if (is_string($expectedValues)) {
+            $this->expectException($expectedValues);
+        }
+        Environment::processEnvironmentFileJson($file);
+
+        foreach ($expectedValues as $name => $value) {
+            $this->assertSame($value, getenv($name));
+            $this->assertSame($value, Environment::get($name));
+        }
+    }
+
+    /**
+     * Data provider for ::testProcessEnvironmentFileJson.
+     */
+    public static function providerProcessEnvironmentFileJson(): array
+    {
+        $fixtureDirectory = dirname(__DIR__) . '/fixtures/';
+        return [
+            'valid-file' => [
+                $fixtureDirectory . 'valid.json',
+                [
+                    'JSON_UPPER_KEY' => 'upper',
+                    'json_lower_key' => 'lower',
+                    'JSON_LOWER_KEY' => false,
+                    'invalid_value' => false,
+                ],
+            ],
+            'invalid-file' => [
+                $fixtureDirectory . 'invalid.json',
+                \JsonException::class,
+            ],
+            'nested-fail' => [
+                $fixtureDirectory . 'nested.json',
+                \JsonException::class,
+            ],
+            'missing-file' => [
+                $fixtureDirectory . 'missing.json',
+                \RuntimeException::class,
+            ],
+        ];
+    }
 }