Search JSON file bash - json

Question

I have following JSON file and would like to extract part of it:
{
"expand": "names,schema",
"issues": [
{
"expand": "operations,versionedRepresentations,editmeta,changelog,renderedFields",
"fields": {
"aggregateprogress": {
"progress": 0,
"total": 0
},
"aggregatetimeestimate": null,
"aggregatetimeoriginalestimate": null,
"aggregatetimespent": null,
"assignee": {
"active": true,
"avatarUrls": {
"16x16": "https://secure.gravatar.com/avatar/5d92f3ce51d4a090cdcb9b77ee890989?d=mm&s=16",
"24x24": "https://secure.gravatar.com/avatar/5d92f3ce51d4a090cdcb9b77ee890989?d=mm&s=24",
"32x32": "https://secure.gravatar.com/avatar/5d92f3ce51d4a090cdcb9b77ee890989?d=mm&s=32",
"48x48": "https://secure.gravatar.com/avatar/5d92f3ce51d4a090cdcb9b77ee890989?d=mm&s=48"
},
"displayName": "user",
"emailAddress": "user#company.com",
"key": "user",
"name": "user",
"self": "https://jira.corp.company.com/rest/api/2/user?username=dvucanovic",
"timeZone": "Europe/Belgrade"
},
"components": [],
"created": "2018-03-06T21:24:41.000+0000",
"creator": {
"active": true,
"avatarUrls": {
"16x16": "https://secure.gravatar.com/avatar/5d92f3ce51d4a090cdcb9b77ee890989?d=mm&s=16",
"24x24": "https://secure.gravatar.com/avatar/5d92f3ce51d4a090cdcb9b77ee890989?d=mm&s=24",
"32x32": "https://secure.gravatar.com/avatar/5d92f3ce51d4a090cdcb9b77ee890989?d=mm&s=32",
"48x48": "https://secure.gravatar.com/avatar/5d92f3ce51d4a090cdcb9b77ee890989?d=mm&s=48"
},
"displayName": "user",
"emailAddress": "user#company.com",
"key": "user",
"name": "user",
"self": "https://jira.corp.company.com/rest/api/2/user?username=dvucanovic",
"timeZone": "Europe/Belgrade"
},
"customfield_10000": null,
"customfield_10001": null,
"customfield_10002": null,
"customfield_10004": "0|i00uta:",
"customfield_10005": null,
"customfield_10006": null,
"customfield_10100": null,
"customfield_10101": [],
"customfield_10102": null,
"customfield_10103": null,
"customfield_10107": {
"id": "10400",
"self": "https://jira.corp.company.com/rest/api/2/customFieldOption/10400",
"value": "Hentsu Internal"
},
"customfield_10108": null,
"customfield_10200": null,
"customfield_10201": "2018-03-06",
"customfield_10202": "2018-03-06",
"customfield_10203": null,
"customfield_10204": null,
"customfield_10205": null,
"customfield_10206": null,
"customfield_10300": "com.atlassian.servicedesk.plugins.approvals.internal.customfield.ApprovalsCFValue#5e6792fb",
"customfield_10301": null,
"customfield_10302": null,
"customfield_10600": null,
"customfield_10700": null,
"customfield_11000": null,
"customfield_11001": null,
"customfield_11002": null,
"customfield_11003": null,
"customfield_11004": null,
"customfield_11005": null,
"customfield_11006": null,
"customfield_11007": null,
"customfield_11008": null,
"customfield_11009": null,
"customfield_11010": null,
"customfield_11011": null,
"customfield_11012": null,
"customfield_11013": null,
"customfield_11014": null,
"customfield_11015": null,
"customfield_11016": null,
"customfield_11017": null,
"customfield_11018": null,
"customfield_11019": null,
"customfield_11100": null,
"customfield_11101": null,
"customfield_11102": null,
"description": null,
"duedate": null,
"environment": null,
"fixVersions": [],
"issuelinks": [],
"issuetype": {
"avatarId": 10318,
"description": "A task that needs to be done.",
"iconUrl": "https://jira.corp.company.com/secure/viewavatar?size=xsmall&avatarId=10318&avatarType=issuetype",
"id": "10100",
"name": "Task",
"self": "https://jira.corp.company.com/rest/api/2/issuetype/10100",
"subtask": false
},
"labels": [],
"lastViewed": "2018-03-06T21:31:34.315+0000",
"priority": {
"iconUrl": "https://jira.corp.company.com/images/icons/priorities/medium.svg",
"id": "3",
"name": "Medium",
"self": "https://jira.corp.company.com/rest/api/2/priority/3"
},
"progress": {
"progress": 0,
"total": 0
},
"project": {
"avatarUrls": {
"16x16": "https://jira.corp.company.com/secure/projectavatar?size=xsmall&pid=10001&avatarId=10201",
"24x24": "https://jira.corp.company.com/secure/projectavatar?size=small&pid=10001&avatarId=10201",
"32x32": "https://jira.corp.company.com/secure/projectavatar?size=medium&pid=10001&avatarId=10201",
"48x48": "https://jira.corp.company.com/secure/projectavatar?pid=10001&avatarId=10201"
},
"id": "10001",
"key": "TECH",
"name": "Technology",
"self": "https://jira.corp.company.com/rest/api/2/project/10001"
},
"reporter": {
"active": true,
"avatarUrls": {
"16x16": "https://secure.gravatar.com/avatar/5d92f3ce51d4a090cdcb9b77ee890989?d=mm&s=16",
"24x24": "https://secure.gravatar.com/avatar/5d92f3ce51d4a090cdcb9b77ee890989?d=mm&s=24",
"32x32": "https://secure.gravatar.com/avatar/5d92f3ce51d4a090cdcb9b77ee890989?d=mm&s=32",
"48x48": "https://secure.gravatar.com/avatar/5d92f3ce51d4a090cdcb9b77ee890989?d=mm&s=48"
},
"displayName": "user",
"emailAddress": "user#company.com",
"key": "user",
"name": "user",
"self": "https://jira.corp.company.com/rest/api/2/user?username=dvucanovic",
"timeZone": "Europe/Belgrade"
},
"resolution": null,
"resolutiondate": null,
"status": {
"description": "",
"iconUrl": "https://jira.corp.company.com/",
"id": "10000",
"name": "Backlog",
"self": "https://jira.corp.company.com/rest/api/2/status/10000",
"statusCategory": {
"colorName": "blue-gray",
"id": 2,
"key": "new",
"name": "To Do",
"self": "https://jira.corp.company.com/rest/api/2/statuscategory/2"
}
},
"subtasks": [
{
"fields": {
"issuetype": {
"avatarId": 10316,
"description": "The sub-task of the issue",
"iconUrl": "https://jira.corp.company.com/secure/viewavatar?size=xsmall&avatarId=10316&avatarType=issuetype",
"id": "10101",
"name": "Sub-task",
"self": "https://jira.corp.company.com/rest/api/2/issuetype/10101",
"subtask": true
},
"priority": {
"iconUrl": "https://jira.corp.company.com/images/icons/priorities/medium.svg",
"id": "3",
"name": "Medium",
"self": "https://jira.corp.company.com/rest/api/2/priority/3"
},
"status": {
"description": "",
"iconUrl": "https://jira.corp.company.com/",
"id": "10000",
"name": "Backlog",
"self": "https://jira.corp.company.com/rest/api/2/status/10000",
"statusCategory": {
"colorName": "blue-gray",
"id": 2,
"key": "new",
"name": "To Do",
"self": "https://jira.corp.company.com/rest/api/2/statuscategory/2"
}
},
"summary": "Disable user account in Local AD"
},
"id": "16916",
"key": "TECH-728",
"self": "https://jira.corp.company.com/rest/api/2/issue/16916"
}
],
"summary": "disable user mm",
"timeestimate": null,
"timeoriginalestimate": null,
"timespent": null,
"updated": "2018-03-06T21:27:22.000+0000",
"versions": [],
"votes": {
"hasVoted": false,
"self": "https://jira.corp.company.com/rest/api/2/issue/TECH-726/votes",
"votes": 0
},
"watches": {
"isWatching": true,
"self": "https://jira.corp.company.com/rest/api/2/issue/TECH-726/watchers",
"watchCount": 1
},
"workratio": -1
},
"id": "16914",
"key": "TECH-726",
"self": "https://jira.corp.company.com/rest/api/2/issue/16914"
}
],
"maxResults": 50,
"startAt": 0,
"total": 1
}
How to extract only part in subtasks section
(subtask:true) ?
tried with:
jq -r '.issues[] | .fields.issuetype.subtask' 1.json # and
jq -r '.subtasks[] |.fields.issuetype.subtask' 1.json
but always get false
jq -r '.subtasks[] | .fields.issuetype.subtask' 1.json
jq: error (at 1.json:231): Cannot iterate over null (null)

Answer 1

jq solution:
jq '.issues[].fields.subtasks[].fields | .issuetype.subtask, .summary' 1.json
The output:
true
"Disable user account in Local AD"

Answer 2

With respect to a best-practice mechanism to iterate over output in bash (assuming, here, that the subtask field will never contain a literal tab, and that summary will never contain a literal newline):
while IFS=$'\t' read -r subtask summary; do
echo "Got subtask $subtask and summary $summary"
done < <(jq -r '.issues[].fields.subtasks[].fields
| [.issuetype.subtask, .summary] | #tsv')
If you want to avoid those assumptions, you can do even better by using NUL delimiters, which will correctly handle all values which can potentially be stored in a variable in bash:
while IFS= read -r -d '' subtask && IFS= read -r -d '' summary; do
printf 'Got subtask %q and summary %q\n' "$subtask" "$summary"
done < <(jq -j '.issues[].fields.subtasks[].fields
| (.issuetype.subtask, "\u0000", .summary, "\u0000")')
Community Wiki since this answer is intended to address an issue observed in comments on the accepted answer, rather than addressing the original question as such.