Grunt - read json object from file - json

Question

I want to use grunt-hash plugin for renaming my js files.
This plugin create a new file containing map of renamed files:
hash: {
options: {
mapping: 'examples/assets.json', //mapping file so your server can serve the right files
Now I need to fix links to this files by replacing all usages (rename 'index.js' to 'index-{hash}.js') so I want to use grunt-text-replace plugin.
According to documentation I need to cofigure replacements:
replace: {
example: {
replacements: [{
from: 'Red', // string replacement
to: 'Blue'
}]
}
}
How could I read json mapping file to get {hash} values for each file and provide them to replace task?

Answer 1

grunt.file.readJSON('your-file.json')
is probably what you are looking for.
I've set up a little test. I have a simple JSON file 'mapping.json', which contains the following JSON object:
{
"mapping": [
{"file": "foo.txt"},
{"file": "bar.txt"}
]
}
In my Gruntfile.js I've written the following simple test task, which reads the first object in the 'mapping'-array:
grunt.registerTask('doStuff', 'do some stuff.', function() {
mapping = grunt.file.readJSON('mapping.json');
grunt.log.write(mapping.mapping[0]["file"]).ok();
});
When invoking the Grunt task, the console output will be as follows:
$ grunt doStuff
Running "doStuff" task
foo.txtOK
Done, without errors.
I hope this helps! :)