How do I use jq to convert number to string?

JsonJq

Json Problem Overview

Given the following jq command and Json:

jq '.[]|[.string,.number]|join(": ")' <<< '
[  {    "number": 3,    "string": "threee"  },  {    "number": 7,    "string": "seven"  }]
'

I'm trying to format the output as:

three: 3
seven: 7

Unfortunately, my attempt is resulting in the following error:

> jq: error: string and number cannot be added

How do I convert the number to string so both can be joined?

Json Solutions

Solution 1 - Json

The jq command has the tostring function. It took me a while to learn to use it by trial and error. Here is how to use it:

jq -r '.[] | [ .string, .number|tostring ] | join(": ")' <<< '
[{ "number": 9, "string": "nine"}, { "number": 4, "string": "four"}]
'
nine: 9
four: 4

Solution 2 - Json

An alternative and arguably more intuitive format is:

jq '.[] | .string + ": " + (.number|tostring)' <<< ...

Worth noting the need for parens around .number|tostring.

Solution 3 - Json

For such simple case string interpolation's implicit casting to string will do it:

.[] | "\( .string ): \( .number )"

See it in action on jq‣play.

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Content TypeOriginal AuthorOriginal Content on Stackoverflow
QuestionAXE LabsView Question on Stackoverflow
Solution 1 - JsonAXE LabsView Answer on Stackoverflow
Solution 2 - JsonAndrew NeilsonView Answer on Stackoverflow
Solution 3 - JsonmanatworkView Answer on Stackoverflow