Ruby Read Json File To Hash

Example to parse json file to hash is illustrated with this tutorial.

Ruby read json file to hash.

This method is available from ruby 2 3 onwards. How to use json with ruby. In ruby read json file to hash can be achieved using file handling. Reading the file and marshal loading the string gives the original object writing to a file can be achieved using marshal dump.

As the name suggests the method digs through the nested hash looking for keys we asked it to look for. Def load user lib filename json parse io read filename end the key here is to use io read as a simple way to load the json string from disk so that it can be parsed. For example in your code this can be achieved using. A hash like object responding to to hash.

If hash alike or hash convertible object is provided it is internally converted into a state object. The way this works is by first having a json file on your disk. My object json parse io read filename encoding utf 8. Before getting started lets talk about what is a json file.

Or a json state object. The keys in the json string are unordered due to the nature of hashes. Or an object convertible into a hash by a to h method. Ruby read json json file.

The best way according to me is using marshal method as explained here marshaling the marshal module dumps an object in a string which can be written to a file. The program then loads the file for parsing parses it and then you can use it. You want json parse or json load. Likewise there is an array class option for json arrays.

The only and except options can be used to limit the attributes included and will accept 1 or more hash keys to include exclude. Or if you have utf 8 data in your file. If you are new to ruby i highly recommend this book. Json javascript object notation can be used by all high level programming languages.

Instead we can use my most favorite method from ruby which is dig. Generate a json document from the ruby data structure obj and return it. Example to parse json file into a hash and write data into our json file is illustrated with this tutorial. Ruby provides a method hash dig which can be used in this case.

Share improve this answer follow. If you are new to json javascript object notation you might want to read introduction to json require json you need to require.