Could you explain why the percent sign is not showing up in the output of stringify?
var data = ["dp",'%%'];
var output = JSON.stringify(data);
console.log ('output: ' + output);
This is the current result:
output: ["dp","%"]
Why isn't the output like this instead:
output: ["dp","%%"]
Appreciate your help!
According to the documentation provided for console.log in Node.js, the function follows a printf-like format:
The initial argument is a string that may contain placeholders.
Each placeholder will be substituted with the respective value from its corresponding argument. The supported placeholders include:%s - String.
%d - Number (both integer and float).
%j - JSON. If circular references are found, it will be replaced by '[Circular]'.
%% - single percent sign ('%'). This placeholder does not require an argument.
In case a placeholder lacks a respective argument, it will remain unchanged.
Hence, whenever %% appears in a string displayed via console.log in Node.js (excluding browsers), it will be swapped out for a single %. Any %s, %d, or %j will be exchanged for a string, number, or JSON string, respectively. Below are some examples:
console.log("This is a string: %s", "Hello, World!");
//= This is a string: Hello, World!
console.log("This is a number: %d", 3.14);
//= This is a number: 3.14
console.log("This is a JSON string: %j", { value: true });
//= This is a JSON string: {"value":true}
console.log("This is a single percentage sign: %%");
//= This is a single percentage sign: %
console.log("If we use %%s and %%d here we get '%s' and '%d'.", "a string", 100);
//= If we use %s and %d here we get 'a string' and '100'.
Using console.log in a browser environment will simply display the plain string without any substitution as mentioned above.
The issue at hand is not related to the utilization of JSON.stringify. I was able to replicate the single % output in node 0.10.36 simply by executing console.log('%%'). This seems to be a problem with the internal usage of util.format within the console.log function in node.
You can find more information on this topic at: https://nodejs.org/docs/latest-v0.10.x/api/util.html#util_util_format_format
On the other hand, when testing in node 4.0, the expected result is returned.
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