> For the complete documentation index, see [llms.txt](https://andrewmcodes.gitbook.io/vcr/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://andrewmcodes.gitbook.io/vcr/request_matching/body_as_json.md).

# Matching on Body

Use the `:body_as_json` request matcher to match requests on the request body where the body is JSON.

## Background ()

*Given* a previously recorded cassette file "cassettes/example.yml" with:

```
---
http_interactions:
- request:
    method: post
    uri: http://example.net/some/long/path
    body:
      encoding: UTF-8
      string: '{ "a" : "1" }'
    headers: {}
  response:
    status:
      code: 200
      message: OK
    headers:
      Content-Length:
      - "14"
    body:
      encoding: UTF-8
      string: body1 response
    http_version: "1.1"
  recorded_at: Tue, 01 Nov 2011 04:58:44 GMT
- request:
    method: post
    uri: http://example.net/some/long/path
    body:
      encoding: UTF-8
      string: '{ "a" : "1", "b" : "2" }'
    headers: {}
  response:
    status:
      code: 200
      message: OK
    headers:
      Content-Length:
      - "14"
    body:
      encoding: UTF-8
      string: body2 response
    http_version: "1.1"
  recorded_at: Tue, 01 Nov 2011 04:58:44 GMT
recorded_with: VCR 2.0.0
```

## Replay interaction that matches the body as JSON

*And* a file named "body\_as\_json\_matching.rb" with:

```
include_http_adapter_for("<http_lib>")

require 'vcr'

VCR.configure do |c|
  <configuration>
  c.cassette_library_dir = 'cassettes'
end

VCR.use_cassette('example', :match_requests_on => [:body_as_json]) do
  puts "Response for body as json 2: " + response_body_for(:put, "http://example.com/", '{ "a" : "1", "b" : "2" }')
end

VCR.use_cassette('example', :match_requests_on => [:body_as_json]) do
  puts "Response for body as json 1: " + response_body_for(:put, "http://example.com/", '{ "a" : "1" }')
end
```

*When* I run `ruby body_as_json_matching.rb`

*Then* it should pass with:

```
Response for body as json 2: body2 response
Response for body as json 1: body1 response
```

### Examples

| configuration          | http\_lib              |
| ---------------------- | ---------------------- |
| c.hook\_into :webmock  | net/http               |
| c.hook\_into :webmock  | httpclient             |
| c.hook\_into :webmock  | curb                   |
| c.hook\_into :webmock  | patron                 |
| c.hook\_into :webmock  | em-http-request        |
| c.hook\_into :webmock  | typhoeus               |
| c.hook\_into :typhoeus | typhoeus               |
| c.hook\_into :excon    | excon                  |
| c.hook\_into :faraday  | faraday (w/ net\_http) |
| c.hook\_into :faraday  | faraday (w/ typhoeus)  |