kristopherjohnson/formatjson.coffee.md

## formatjson.coffee.md

      
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              formatjson.coffee.md
            
          
    formatjson

This Literate CoffeeScript program reads JSON from standard input and writes equivalent nicely-formatted JSON to standard output.
Define a couple of short variable names for the Node.js stdin and stdout members.
stdin = process.stdin
stdout = process.stdout
Set the standard-input encoding to utf8 so that we receive data as a string, and invoke resume() so that we receive input data.
stdin.setEncoding 'utf8'
stdin.resume()
As data is read from standard input, save it to an array of "chunks".
inputChunks = []
stdin.on 'data', (chunk) -> inputChunks.push chunk
When we reach the end of the data, join all the chunks into a single string, parse it as JSON, reformat it, and write it to standard output. Terminate the output with a newline and we're done.
stdin.on 'end', () ->
    inputJSON = inputChunks.join()
    parsedData = JSON.parse inputJSON
    outputJSON = JSON.stringify parsedData, null, '    '

    stdout.write outputJSON
    stdout.write "\n"