diff --git a/api/package.json b/api/package.json
index ed12ad42..0f6c01d0 100644
--- a/api/package.json
+++ b/api/package.json
@@ -13,7 +13,7 @@
         "test": "vitest --watch=false",
         "dev": "yarn build && yarn start",
         "build": "tsc",
-        "start": "./.env.local.sh forever dist/main.js",
+        "start": "dotenv -e ../.env -- forever dist/main.js",
         "_format": "prettier \"**/*.{ts,tsx,json,md}\"",
         "format": "yarn run _format --write",
         "format:check": "yarn run _format --list-different",
@@ -51,6 +51,7 @@
         "cors": "^2.8.5",
         "csv-parse": "^5.0.4",
         "deepmerge": "^4.2.2",
+        "dotenv-cli": "^7.4.1",
         "evt": "^2.5.7",
         "express": "^4.17.2",
         "forever": "^4.0.3",
diff --git a/api/src/env.ts b/api/src/env.ts
index a5a1a82b..060c0633 100644
--- a/api/src/env.ts
+++ b/api/src/env.ts
@@ -1,11 +1,8 @@
-import { symToStr } from "tsafe/symToStr";
-import { assert } from "tsafe/assert";
 import * as JSONC from "comment-json";
 import { z } from "zod";
 import { zLocalizedString } from "./core/ports/GetSoftwareExternalData";
-import { is } from "tsafe/is";
 
-const zParsedCONFIGURATION = z.object({
+const zConfiguration = z.object({
     "keycloakParams": z
         .object({
             "url": z.string().nonempty(), //Example: https://auth.code.gouv.fr/auth (with the /auth at the end)
@@ -33,42 +30,59 @@ const zParsedCONFIGURATION = z.object({
     // we use the GitHub API for pre filling the version when adding a software
     "githubPersonalAccessTokenForApiRateLimit": z.string().nonempty(),
     //Port we listen to, default 8080
-    "port": z.number().optional(),
+    "port": z.coerce.number().optional(),
     "isDevEnvironnement": z.boolean().optional(),
     // Completely disable this instance and redirect to another url
     "redirectUrl": z.string().optional(),
     "externalSoftwareDataOrigin": z.enum(["wikidata", "HAL"]).optional()
 });
 
-const { parsedCONFIGURATION } = (() => {
+const getJsonConfiguration = () => {
     const { CONFIGURATION } = process.env;
-
-    if (CONFIGURATION === undefined) {
-        throw new Error(
-            `We need a ${symToStr({
-                CONFIGURATION
-            })} environnement variable`
-        );
-    }
-
-    let parsedCONFIGURATION: unknown;
-
-    try {
-        parsedCONFIGURATION = JSONC.parse(CONFIGURATION) as any;
-    } catch (error) {
-        throw new Error(
-            `The CONFIGURATION environnement variable is not a valid JSONC string (JSONC = JSON + Comment support)\n${CONFIGURATION}: ${String(
-                error
-            )}`
-        );
+    if (CONFIGURATION) {
+        try {
+            return JSONC.parse(CONFIGURATION) as any;
+        } catch (error) {
+            throw new Error(
+                `The CONFIGURATION environnement variable is not a valid JSONC string (JSONC = JSON + Comment support)\n${CONFIGURATION}: ${String(
+                    error
+                )}`
+            );
+        }
     }
 
-    zParsedCONFIGURATION.parse(parsedCONFIGURATION);
+    return {
+        "keycloakParams": {
+            "url": process.env.SILL_KEYCLOAK_URL,
+            "realm": process.env.SILL_KEYCLOAK_REALM,
+            "clientId": process.env.SILL_KEYCLOAK_CLIENT_ID,
+            "adminPassword": process.env.SILL_KEYCLOAK_ADMIN_PASSWORD,
+            "organizationUserProfileAttributeName": process.env.SILL_KEYCLOAK_ORGANIZATION_USER_PROFILE_ATTRIBUTE_NAME
+        },
+        "readmeUrl": process.env.SILL_README_URL,
+        "termsOfServiceUrl": process.env.SILL_TERMS_OF_SERVICE_URL,
+        "jwtClaimByUserKey": {
+            "id": process.env.SILL_JWT_ID,
+            "email": process.env.SILL_JWT_EMAIL,
+            "organization": process.env.SILL_JWT_ORGANIZATION
+        },
+        "dataRepoSshUrl": process.env.SILL_DATA_REPO_SSH_URL,
+        "sshPrivateKeyForGitName": process.env.SILL_SSH_NAME,
+        "sshPrivateKeyForGit": process.env.SILL_SSH_PRIVATE_KEY,
+        "githubPersonalAccessTokenForApiRateLimit": process.env.SILL_GITHUB_TOKEN,
+        "githubWebhookSecret": process.env.SILL_WEBHOOK_SECRET,
+        "port": parseInt(process.env.SILL_API_PORT ?? ""),
+        "isDevEnvironnement": process.env.SILL_IS_DEV_ENVIRONNEMENT?.toLowerCase() === "true",
+        "externalSoftwareDataOrigin": process.env.SILL_EXTERNAL_SOFTWARE_DATA_ORIGIN
+    };
+};
 
-    assert(is<ReturnType<(typeof zParsedCONFIGURATION)["parse"]>>(parsedCONFIGURATION));
+const getValidConfiguration = (): z.infer<typeof zConfiguration> => {
+    const configuration = getJsonConfiguration();
+    return zConfiguration.parse(configuration);
+};
 
-    return { parsedCONFIGURATION };
-})();
+const parsedCONFIGURATION = getValidConfiguration();
 
 export const env = {
     ...parsedCONFIGURATION,
diff --git a/yarn.lock b/yarn.lock
index c97d2b2e..4f3cb25f 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -7642,6 +7642,21 @@ dot-prop@^4.1.0:
   dependencies:
     is-obj "^1.0.0"
 
+dotenv-cli@^7.4.1:
+  version "7.4.1"
+  resolved "https://registry.yarnpkg.com/dotenv-cli/-/dotenv-cli-7.4.1.tgz#be3895878775c257e9864e5e57ff801d7492dcf8"
+  integrity sha512-fE1aywjRrWGxV3miaiUr3d2zC/VAiuzEGghi+QzgIA9fEf/M5hLMaRSXb4IxbUAwGmaLi0IozdZddnVU96acag==
+  dependencies:
+    cross-spawn "^7.0.3"
+    dotenv "^16.3.0"
+    dotenv-expand "^10.0.0"
+    minimist "^1.2.6"
+
+dotenv-expand@^10.0.0:
+  version "10.0.0"
+  resolved "https://registry.yarnpkg.com/dotenv-expand/-/dotenv-expand-10.0.0.tgz#12605d00fb0af6d0a592e6558585784032e4ef37"
+  integrity sha512-GopVGCpVS1UKH75VKHGuQFqS1Gusej0z4FyQkPdwjil2gNIv+LNsqBlboOzpJFZKVT95GkCyWJbBSdFEFUWI2A==
+
 dotenv-expand@^5.1.0:
   version "5.1.0"
   resolved "https://registry.yarnpkg.com/dotenv-expand/-/dotenv-expand-5.1.0.tgz#3fbaf020bfd794884072ea26b1e9791d45a629f0"
@@ -7652,6 +7667,11 @@ dotenv@^10.0.0:
   resolved "https://registry.yarnpkg.com/dotenv/-/dotenv-10.0.0.tgz#3d4227b8fb95f81096cdd2b66653fb2c7085ba81"
   integrity sha512-rlBi9d8jpv9Sf1klPjNfFAuWDjKLwTIJJ/VxtoTwIR6hnZxcEOQCZg2oIL3MWBYw5GpUDKOEnND7LXTbIpQ03Q==
 
+dotenv@^16.3.0:
+  version "16.4.5"
+  resolved "https://registry.yarnpkg.com/dotenv/-/dotenv-16.4.5.tgz#cdd3b3b604cb327e286b4762e13502f717cb099f"
+  integrity sha512-ZmdL2rui+eB2YwhsWzjInR8LldtZHGDoQ1ugH85ppHKwpUHL7j7rN0Ti9NCnGiQbhaZ11FpR+7ao1dNsmduNUg==
+
 dotenv@^8.0.0:
   version "8.6.0"
   resolved "https://registry.yarnpkg.com/dotenv/-/dotenv-8.6.0.tgz#061af664d19f7f4d8fc6e4ff9b584ce237adcb8b"