diff --git a/API_SQLuedo/API/Program.cs b/API_SQLuedo/API/Program.cs
index 559793d..62b1cc3 100644
--- a/API_SQLuedo/API/Program.cs
+++ b/API_SQLuedo/API/Program.cs
@@ -95,6 +95,13 @@ builder.Services.AddCors(options =>
         });
 });
 
+var configuration = new ConfigurationBuilder()
+    .SetBasePath(Directory.GetCurrentDirectory())
+    .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
+    .Build();
+
+builder.Services.AddSingleton(configuration);
+
 
 var app = builder.Build();
 
diff --git a/API_SQLuedo/API/Service/QueryDataServiceApi.cs b/API_SQLuedo/API/Service/QueryDataServiceApi.cs
index 636f235..f4bff6d 100644
--- a/API_SQLuedo/API/Service/QueryDataServiceApi.cs
+++ b/API_SQLuedo/API/Service/QueryDataServiceApi.cs
@@ -4,6 +4,7 @@ using Model.OrderCriteria;
 using Npgsql;
 using Shared;
 using Shared.Mapper;
+using Microsoft.Extensions.Configuration;
 using System.Text;
 using Newtonsoft.Json;
 using Microsoft.EntityFrameworkCore.Metadata.Internal;
@@ -11,11 +12,16 @@ using Microsoft.EntityFrameworkCore.Metadata.Internal;
 namespace API.Service;
 
 public class QueryDataServiceApi : IQueryService<QueryDto>{
+    private readonly IConfiguration _configuration;
 
+    public QueryDataServiceApi(IConfiguration configuration)
+    {
+        _configuration = configuration;
+    }
     public QueryDto ExecuteQuery(string query, string database)
     {
-        string connectionString =
-            $"Host=localhost;Username=admin;Password=motdepasse;Database={database}";
+        string connectionString = _configuration.GetConnectionString("DefaultConnection");
+        connectionString = connectionString.Replace("{database}", database);
 
         if (string.IsNullOrEmpty(database))
         {
@@ -67,8 +73,8 @@ public class QueryDataServiceApi : IQueryService<QueryDto>{
 
     public QueryDto GetTables(string database)
     {
-        string connectionString =
-            $"Host=localhost;Username=admin;Password=motdepasse;Database={database}";
+        string connectionString = _configuration.GetConnectionString("DefaultConnection");
+        connectionString = connectionString.Replace("{database}", database);
 
         try
         {
@@ -120,10 +126,10 @@ public class QueryDataServiceApi : IQueryService<QueryDto>{
 
     public QueryDto GetColumns(string database, string table)
     {
-        string connectionString =
-            $"Host=localhost;Username=admin;Password=motdepasse;Database={database}";
+        string connectionString = _configuration.GetConnectionString("DefaultConnection");
+        connectionString = connectionString.Replace("{database}", database);
 
-            using (NpgsqlConnection connection = new NpgsqlConnection(connectionString))
+        using (NpgsqlConnection connection = new NpgsqlConnection(connectionString))
             {
                 connection.Open();
                 using (NpgsqlCommand command = new NpgsqlCommand())
diff --git a/API_SQLuedo/API/appsettings.json b/API_SQLuedo/API/appsettings.json
index 10f68b8..639275d 100644
--- a/API_SQLuedo/API/appsettings.json
+++ b/API_SQLuedo/API/appsettings.json
@@ -5,5 +5,8 @@
       "Microsoft.AspNetCore": "Warning"
     }
   },
-  "AllowedHosts": "*"
+  "AllowedHosts": "*",
+  "ConnectionStrings": {
+    "DefaultConnection": "Host=localhost;Username=admin;Password=motdepasse;Database={database}"
+  }
 }