diff --git a/src/handlers/anthropic.ts b/src/handlers/anthropic.ts
index 3fed753..8ce5335 100644
--- a/src/handlers/anthropic.ts
+++ b/src/handlers/anthropic.ts
@@ -87,10 +87,10 @@ export async function AnthropicHandler(
 export async function AnthropicHandler(
   params: HandlerParams,
 ): Promise<ResultNotStreaming | ResultStreaming> {
-  const api_key = params.api_key ?? process.env.ANTHROPIC_API_KEY;
+  const apiKey = params. apiKey ?? process.env.ANTHROPIC_API_KEY;
 
   const anthropic = new Anthropic({
-    apiKey: api_key,
+    apiKey: apiKey,
   });
   const prompt = toAnthropicPrompt(params.messages);
 
diff --git a/src/handlers/cohere.ts b/src/handlers/cohere.ts
index 2c36e34..8d64ab0 100644
--- a/src/handlers/cohere.ts
+++ b/src/handlers/cohere.ts
@@ -51,9 +51,9 @@ export async function CohereHandler(
 export async function CohereHandler(
   params: HandlerParams,
 ): Promise<ResultNotStreaming | ResultStreaming> {
-  const api_key = params.api_key ?? process.env.COHERE_API_KEY!;
+  const apiKey = params. apiKey ?? process.env.COHERE_API_KEY!;
 
-  cohere.init(api_key);
+  cohere.init(apiKey);
   const textsCombined = combinePrompts(params.messages);
 
   const config = {
diff --git a/src/handlers/deepinfra.ts b/src/handlers/deepinfra.ts
index 379a66b..d1b19d5 100644
--- a/src/handlers/deepinfra.ts
+++ b/src/handlers/deepinfra.ts
@@ -36,14 +36,14 @@ async function getDeepInfraResponse(
   model: string,
   messages: Message[],
   baseUrl: string,
-  api_key: string,
+  apiKey: string,
   stream: boolean,
 ): Promise<Response> {
   return fetch(`${baseUrl}/v1/openai/chat/completions`, {
     method: 'POST',
     headers: {
       'Content-Type': 'application/json',
-      Authorization: `Bearer ${api_key}`,
+      Authorization: `Bearer ${apiKey}`,
     },
     body: JSON.stringify({
       messages,
@@ -69,14 +69,14 @@ export async function DeepInfraHandler(
   params: HandlerParams,
 ): Promise<ResultNotStreaming | ResultStreaming> {
   const baseUrl = params.baseUrl ?? 'https://api.deepinfra.com';
-  const api_key = params.api_key ?? process.env.DEEPINFRA_API_KEY!;
+  const apiKey = params. apiKey ?? process.env.DEEPINFRA_API_KEY!;
   const model = params.model.split('deepinfra/')[1];
 
   const res = await getDeepInfraResponse(
     model,
     params.messages,
     baseUrl,
-    api_key,
+    apiKey,
     params.stream ?? false,
   );
 
diff --git a/src/handlers/mistral.ts b/src/handlers/mistral.ts
index a8767bf..52af9de 100644
--- a/src/handlers/mistral.ts
+++ b/src/handlers/mistral.ts
@@ -37,14 +37,14 @@ async function getMistralResponse(
   model: string,
   messages: Message[],
   baseUrl: string,
-  api_key: string,
+  apiKey: string,
   stream: boolean,
 ): Promise<Response> {
   return fetch(`${baseUrl}/v1/chat/completions`, {
     method: 'POST',
     headers: {
       'Content-Type': 'application/json',
-      Authorization: `Bearer ${api_key}`,
+      Authorization: `Bearer ${apiKey}`,
     },
     body: JSON.stringify({
       messages,
@@ -70,14 +70,14 @@ export async function MistralHandler(
   params: HandlerParams,
 ): Promise<ResultNotStreaming | ResultStreaming> {
   const baseUrl = params.baseUrl ?? 'https://api.mistral.ai';
-  const api_key = params.api_key ?? process.env.MISTRAL_API_KEY!;
+  const apiKey = params. apiKey ?? process.env.MISTRAL_API_KEY!;
   const model = params.model.split('mistral/')[1];
 
   const res = await getMistralResponse(
     model,
     params.messages,
     baseUrl,
-    api_key,
+    apiKey,
     params.stream ?? false,
   );
 
diff --git a/src/handlers/mistralEmbedding.ts b/src/handlers/mistralEmbedding.ts
index 726ece0..47273fa 100644
--- a/src/handlers/mistralEmbedding.ts
+++ b/src/handlers/mistralEmbedding.ts
@@ -5,13 +5,13 @@ async function getMistralResponse(
   model: string,
   input: EmbeddingParams['input'],
   baseUrl: string,
-  api_key: string,
+  apiKey: string,
 ): Promise<Response> {
   return fetch(`${baseUrl}/v1/embeddings`, {
     method: 'POST',
     headers: {
       'Content-Type': 'application/json',
-      Authorization: `Bearer ${api_key}`,
+      Authorization: `Bearer ${apiKey}`,
     },
     body: JSON.stringify({
       model,
@@ -25,12 +25,12 @@ export async function MistralEmbeddingHandler(
 ): Promise<EmbeddingResponse> {
   const model = params.model.split('mistral/')[1];
   const baseUrl = params.baseUrl ?? 'https://api.mistral.ai';
-  const api_key = params.api_key ?? process.env.MISTRAL_API_KEY!;
+  const apiKey = params. apiKey ?? process.env.MISTRAL_API_KEY!;
   const response = await getMistralResponse(
     model,
     params.input,
     baseUrl,
-    api_key,
+    apiKey,
   );
 
   if (!response.ok) {
diff --git a/src/handlers/openai.ts b/src/handlers/openai.ts
index cfbf9e4..6cf6f2b 100644
--- a/src/handlers/openai.ts
+++ b/src/handlers/openai.ts
@@ -45,7 +45,7 @@ export async function OpenAIHandler(
 export async function OpenAIHandler(
   params: HandlerParams,
 ): Promise<ResultNotStreaming | ResultStreaming> {
-  const api_key = params.api_key ?? process.env.OPENAI_API_KEY;
+  const apiKey = params. apiKey ?? process.env.OPENAI_API_KEY;
 
   const openai = new OpenAI({
     apiKey: apiKey,