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If you need to compare two JSON objects to check if they are equal or not, it’s better to iterate over and compare each property. Same applies if you are trying to write the json object in a file with pretty printed format.
#NODEJS READ JSON FILE CODE#
Here is the javascript code snippet that will do the trick: In Such cases, what you need is pretty printing the JSON object. If you are trying to see if a large JSON has something you are expecting, then its very hard to locate if its printed in flat structure. In debugging, we alway like to print data to console to verify if its OK. This can be done in a for loop easily as like below: Sometimes you will might need to traverse through each elements of the JSON object. Well, to delete an element from a JSON object, it can be done by using the ‘delete’ keyword. You can do that using either of the two ways as below: Say, you have an existing json object, which you want to modify to add new key/value pair(s). It’s as simple as that! Add New Element To Existing JSON Object: Here, NodeJS automatically read the file, parse the content to a JSON object and assigns that to the left hand side variable. Var jsonObj = require("./path/to/myjsonfile.json") But, I don’t really see any meaning of that at all, as we can simply do the same thing by: Read JSON From File System In NodeJS:Īt first I tried googling about it, I found a solution, which shows example with file system support of nodejs(fs module). This stack-overflow thread might also help in understanding the differences easily. However, you will need to be careful that you are declaring properties properly instead of declaring them as local variable. If you are writing JavaScript OOP style and want to convert an object instance to JSON like string(with its attributes name/value as key/value), You still can use the same JSON object to string approach as below: Treat User Defined Class Instance To JSON String: JSON Object To String:Īs like the previous case, we can use the same global object’s ‘stringify’ method to convert a given json to string data. Otherwise, it won’t get parsed and you will face an unexpected error. Also, it might be good idea to use “.trim()” method on the string, if you think there might be some chance of extra space etc in the JSON string. This is very much easier and straight forward as below:Īs you can see, we are using the built-in global JSON Object to parse a string which has JSON Data. Though most of this tutorial will apply to both kind of JavaScript, few could be specific to Node.js. I am trying to aggregate most of the operations that we can usually perform related to JSON object. As NodeJs being a server side platform, it has a little more capability than browser-based JavaScript, like writing to file system etc.
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JSON is a common format you face every now and then in JavaScript, whether its client side or server side.
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So, now I am again brushing up my long forgotten JavaScript skill. Recently I started learning and working on Node.js platform.