fiber/docs/api/middleware/envvar.md
cmd777 8b1f9260a3
📚 Docs: Fix typos, and make middleware documentation more consistent (#2408)
Fix typos, and make docs more consistent
This fixes several typos in the ISSUE_TEMPLATES, as well as improve
their readability, also makes the documentation markdowns more
consistent
2023-04-10 10:48:12 +08:00

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---
id: envvar
title: EnvVar
---
EnvVar middleware for [Fiber](https://github.com/gofiber/fiber) that can be used to expose environment variables with various options.
## Signatures
```go
func New(config ...Config) fiber.Handler
```
## Examples
Import the middleware package that is part of the Fiber web framework
```go
import (
"github.com/gofiber/fiber/v2"
"github.com/gofiber/fiber/v2/middleware/envvar"
)
```
After you initiate your Fiber app, you can use the following possibilities:
```go
// Initialize default config
app.Use("/expose/envvars", envvar.New())
// Or extend your config for customization
app.Use("/expose/envvars", envvar.New(
envvar.Config{
ExportVars: map[string]string{"testKey": "", "testDefaultKey": "testDefaultVal"},
ExcludeVars: map[string]string{"excludeKey": ""},
}),
)
```
:::note
You will need to provide a path to use the envvar middleware.
:::
## Response
Http response contract:
```
{
"vars": {
"someEnvVariable": "someValue",
"anotherEnvVariable": "anotherValue",
}
}
```
## Config
```go
// Config defines the config for middleware.
type Config struct {
// ExportVars specifies the environment variables that should export
ExportVars map[string]string
// ExcludeVars specifies the environment variables that should not export
ExcludeVars map[string]string
}
```
## Default Config
```go
Config{}
```