Dynamic/computed Keys In JMESPath?

From ES2015 with computed properties and Array.reduce/Array.map/Object.assign you can do: [{name: 'foo', age: 43}, {name: 'bar', age: 55}].map( o => ({[o.name]: o.age})).re

Solution 1:

Problem

• How to construct a Jmespath query that returns objects with arbitrary key-value pairs
• The keys need to be dynamic, based on the output of a jmespath filter expression

Workaround

• As of this writing (2019-03-22), dynamic keys are not available in standard Jmespath
• However, it is possible to return a list of lists instead of a list of objects, and simply post-process that list of lists outside of jmespath

Example

 [*].[@.name,@.age]

Returns

[['foo', 43], ['bar', 55]]

Which can then be post-processed outside of Jmespath, if that is an option for you.

See also

• github issue about this exact use-case

Solution 2:

To get this result precisely: { foo: 43, bar: 55 } , you should use this query:

@.{foo: @[0].age, bar: @[1].age}

But as you can see I don't retrieve the keys foo and bar dynamically because I can't do it in JMES Path