Automatically use JSONPretty/XMLPretty if '?pretty' in querystring

[subchen]

We usually use c.JSON() to response a json object, but it outputs a compact json format as default, that are not readable.

As debug purpose, we maybe want to get a pretty json format for readable. Then, we have to change code to addecho.Debug=true or use c.JSONPretty(), rebuild and redeploy. It is not accepted for us in a deployed box.

So I bring a dynamic pretty response for JSON and XML.
In code, I will always use c.JSON() to output json. When I want to get a pretty json response, I only need add a ?pretty into querystring in my request URL, no any changes for my application.

Example:

# get default json
curl -fSL http://127.0.0.1:8080/v1/test

{"error":500,"message":"unable to get status","casue":"file not found: /tmp/data"}

# get pretty json
curl -fSL http://127.0.0.1:8080/v1/test?pretty

{
    "error":500,
    "message":"unable to get status",
    "casue":"file not found: /tmp/data"
}

It works on all APIs, includes GET, POST, etc.

[coveralls]

Coverage increased (+0.05%) to 83.76% when pulling 950dc52 on subchen:auto-pretty into 1049c96 on labstack:master.

[coveralls]

Coverage increased (+0.05%) to 83.76% when pulling 950dc52 on subchen:auto-pretty into 1049c96 on labstack:master.

[coveralls]

Coverage increased (+0.05%) to 83.76% when pulling 950dc52 on subchen:auto-pretty into 1049c96 on labstack:master.

[coveralls]

Coverage increased (+0.2%) to 83.946% when pulling 45f3428 on subchen:auto-pretty into 1049c96 on labstack:master.

[vishr]

You can directly use _, pretty := c.QueryParams()["pretty"]. Just for consistency please rename the isPretty to pretty.

PS: Same for XML

[subchen]

OK, I will update.

[vishr]

@subchen See if you also update the docs https://echo.labstack.com/guide/response#send-json?

[subchen]

@vishr, Guide document updated, please help review.
Thanks

[coveralls]

Coverage increased (+0.2%) to 83.916% when pulling bf47174 on subchen:auto-pretty into 1049c96 on labstack:master.

[vishr]

Thanks for your contribution.