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jq Cookbook for API Responses: Filter, Reshape, Group and Handle Missing Fields

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Self-Hosting & Infra beginner 7 min read $0.01 Updated 2026-10-20

Working jq patterns: paths and optional access, map and select, to_entries, group_by, unique, sort_by, string interpolation, CSV and TSV output, --arg and --argjson, slurp, streaming large files and common quoting errors.

Pull the fields you need from messy JSON in the terminal. Select and filter arrays, reshape objects, group and count, handle null and missing keys, build CSV, and pass shell variables safely.

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