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In this section we will talk about interpreting the Jason encoded data
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javascript object and notation.
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Jason attempts to strike a balance between human and mission readability.
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Armed with a fear Jason rules most humans can read Jason data moved past simply guessing at what it
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means and confidently interpret the data structures defined by the Jason data.
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At the same time Jason data makes it easy for programs to convert Jason text into variables making it
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very useful for data exchange between applications using API ice you can find the details of Jason in
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our FC 8 2 5 9 and in a number of sites found with the Internet searches including the w w w that Jason
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that arc saw.
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Let's start with the interpreting to Jason as the data flows back and forth between our application
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and the network controller.
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That data is commonly written in Jason data format.
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You can't think of that skill and that the task with two major branches first even ignoring the syntax
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and spatial characters anyone who knows the topic can probably make an intelligent guesses about the
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meaning of many of the key Valley pairs for example without knowing anything about Jason's syntax.
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You could probably do to mine from your prior knowledge of Cisco or others and switches that the Jason
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on the screen that lists to the wise maybe they are just names and a list of interfaces on each device.
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You can see in here this is Jason.
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Yep but we have our one.
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Probably.
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That's the host name are two.
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That's also the house name and the interfaces of the rather one and these are the interfaces of the
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rather two right.
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Okay.
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Honestly you probably already know everything needed to do this kind of intelligent guessing.
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However to perform the second type of task where you analyze the adjacent data to find the data structures
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including objects lists and key value pairs you need to know a bit more about Jason's syntax.
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So let's go ahead with the key value pairs in Jason's syntax guys.
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Each and every column identifies one key value pair with the key before the column and the value after
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the column so you can see in here we have one true and three key value pairs.
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These are the keys and these are the values.
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So first best is the key and messy is the value.
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Second best is the key run out low is the value.
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Third best is the key and Pella is the value.
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Okay let's go ahead with the key key is the text inside.
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Double quotes before the column.
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Use that as the name that area for instance value.
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Okay.
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We have already talked about this one that should be in.
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Yes key should be inside the double quotes and this is our key and you can see it's inside the double
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codes and that is before the double column you can see in here.
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So inside the double quotes and before the Colum.
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Okay so let's go ahead with the value volley is the item after the column that represents the value
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of the key which can be a volley can be and taxed guys that should be listed in double quotes like in
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here and volley also can be numeric.
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If our volley is numeric that is listed without chords that can be an array and object and they are
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as some special values then we will talk about more details on our later sections okay on Jason's syntax
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when we need to list multiple key value pairs we need to separate the pairs with a comma and NE as you
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can see in here the first comma and the second comma but whereas the third comma we don't use the comma
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at the end of the last key value pair okay.
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Let's go ahead with some more information we have objects and the array terms object is a series of
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key value pairs and close to in an matched pair of curly brackets here is the thing that we need to
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care about.
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Objects should be inside the color brackets guys with an opening left curly bracket and it's matching
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right color bracket when it comes to array array is as series of values not key value pairs.
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Okay.
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Pay attention this one and enclose the in a matched pair of square brackets.
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This time with an opening left screen bracket and its matching right square bracket.
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So what about the key value pairs inside the objects.
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All key value pairs inside an object conform to the earlier rules for the key value pairs.
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We talked already and all values inside inside the arrays conform to the earlier rules for formatting
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values.
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For example double quotes around tags no quotes around the numbers are okay below the screen shows a
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single array in Jason format.
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In here you can see a single array in Jason format.
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Notice the Jason data begins with
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two square brackets and then lists three text values in here they are messy Ronaldo and d blah and the
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values could have been a mix of values and it ends with another square bracket
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while example on previous slide shows only the array itself Jason arrays can be used as a value in any
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key value pair figure on the screen does just that and shown in a graphic to elo is here highlighting
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of the arrays and the objects.
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The Jason text in the figure includes two arrays as values and a these values each from just after column
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indicating they are values really.
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So here is the first Jason array.
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So here it is.
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Jason array with
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please pay attention to start and finish at the first Jason array.
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And this is the first for favorite players and they are messy Ronaldo and Bella.
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And this is the second Jason array and it's the favorite teams and they are Barcelona U.N. those and
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the document.
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So now let's think about the entire structure of the Jason data.
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In previous slide it has a matched pair of Charlie brackets to begin and end the text encapsulating
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one object that object contains two columns.
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So there are two key value pairs inside the object.
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When you think about the broader structure as depicted in the figure on the screen you can see now this
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Jason File has one Jason object itself with two key value pairs.
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Please note that this figure does not show the correct Jason's syntax for the lists.
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It instead is intended to make sure used to see the structure of the one object and its two key value
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pairs to drive home the idea of how to find Jason objects.
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You can consider the examples shown in this slide.
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This figure shows the correct Jason's syntax guys and it has the following.
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There is one object for the entire set because it begins and ends with curly braces.
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You can see it in here
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then the outer object has two keys and the first key is when those favorites and the second key is the
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interface config.
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The value of each key value pair is another object.
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So each with curly braces and you can see them here here and here and also we have three key value pairs.
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Key value pair.
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1 2 3 key value pair 1 2 3 OK.
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The Jason example in this slide shows how Jason can list objects and arrays.
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That is Jason puts one object or array inside another.
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Much of the Jason output you will see as you learn more and more about network automation will include
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Jason data with nested arrays and objects okay.
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So far all the Jason examples show lots of empty space.
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Jason allows for white space or not depending on your needs for humans.
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Reading Jason can be a lot easier with the text organized with space and light for instance having the
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match to opening and closing brackets sit at the same left offset makes it much easier to find which
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brackets go with which when stored in a file or sent in a network.
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Jason does not use whitespace For instance earlier in the section figure on a bow of the screenshot
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one.
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Jason object with three key value pairs with what space taking five lines however stored in a file or
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send over and network.
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The Jason will look like as the low of the screen.
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Most of the tools you might use when working with Jason will let you toggle from our printed format
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which is good for humans to air rare round format which is good for computers.
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You might see the printed version literally called pretty or a bit of white or spaced while the version
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with no extra whitespace might be called meaning fight or ROF.
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