---
lang: en
title: 'API docs: openapi-v3.mergesecurityschemetospec'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/openapi-v3
permalink: /doc/en/lb4/apidocs.openapi-v3.mergesecurityschemetospec.html
---

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[Home](./index.md) &gt; [@loopback/openapi-v3](./openapi-v3.md) &gt; [mergeSecuritySchemeToSpec](./openapi-v3.mergesecurityschemetospec.md)

## mergeSecuritySchemeToSpec() function

Security scheme merge helper function to patch the current OpenAPI spec. It provides a direct route to add a security schema to the specs components. It returns a new merged object without modifying the original one.

**Signature:**

```typescript
export declare function mergeSecuritySchemeToSpec(spec: OpenApiSpec, schemeName: string, schemeSpec: SecuritySchemeObject): OpenApiSpec;
```

## Parameters

<table><thead><tr><th>

Parameter


</th><th>

Type


</th><th>

Description


</th></tr></thead>
<tbody><tr><td markdown="1">

spec


</td><td markdown="1">

[OpenApiSpec](./openapi-v3.openapispec.md)


</td><td markdown="1">


</td></tr>
<tr><td markdown="1">

schemeName


</td><td markdown="1">

string


</td><td markdown="1">

The name of the security scheme to be added


</td></tr>
<tr><td markdown="1">

schemeSpec


</td><td markdown="1">

SecuritySchemeObject


</td><td markdown="1">

The security scheme spec body to be added,


</td></tr>
</tbody></table>

**Returns:**

[OpenApiSpec](./openapi-v3.openapispec.md)