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jq.md(archivo creado)
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| 1 | + | # Processing JSON using jq | |
| 2 | + | ||
| 3 | + | jq is useful to slice, filter, map and transform structured json data. | |
| 4 | + | ||
| 5 | + | ## Useful arguments | |
| 6 | + | ||
| 7 | + | When running jq, the following arguments may become handy: | |
| 8 | + | ||
| 9 | + | | Argument | Description | | |
| 10 | + | | ----------------| :------------:| | |
| 11 | + | | `--version`| Output the jq version and exit with zero. | | |
| 12 | + | | `--sort-keys` | Output the fields of each object with the keys in sorted order.| | |
| 13 | + | ||
| 14 | + | ## Basic concepts | |
| 15 | + | ||
| 16 | + | The syntax for jq is pretty coherent: | |
| 17 | + | ||
| 18 | + | | Syntax | Description | | |
| 19 | + | | --------| :------------:| | |
| 20 | + | | , | Filters separated by a comma will produce multiple independent outputs| | |
| 21 | + | | ? | Will ignores error if the type is unexpected | | |
| 22 | + | | [] | Array construction | | |
| 23 | + | | {} | Object construction | | |
| 24 | + | | + | Concatenate or Add | | |
| 25 | + | | - | Difference of sets or Substract | | |
| 26 | + | | length | Size of selected element | | |
| 27 | + | | | | Pipes are used to chain commands in a similar fashion than bash| | |
| 28 | + | ||
| 29 | + | ||
| 30 | + | ## Dealing with json objects | |
| 31 | + | ||
| 32 | + | | Description | Command | | |
| 33 | + | | ------------| :-----: | | |
| 34 | + | | Display all keys | `jq 'keys'` | | |
| 35 | + | | Adds + 1 to all items | `jq 'map_values(.+1)'` | | |
| 36 | + | | Delete a key| `jq 'del(.foo)'` | | |
| 37 | + | | Convert an object to array | `to_entries | map([.key, .value])` | | |
| 38 | + | ||
| 39 | + | ## Dealing with fields | |
| 40 | + | ||
| 41 | + | | Description | Command | | |
| 42 | + | | ------------| :-----: | | |
| 43 | + | | Concatenate two fields| `fieldNew=.field1+' '+.field2` | | |
| 44 | + | ||
| 45 | + | ||
| 46 | + | ## Dealing with json arrays | |
| 47 | + | ||
| 48 | + | ### Slicing and Filtering | |
| 49 | + | ||
| 50 | + | | Description | Command | | |
| 51 | + | | ------------| :-----: | | |
| 52 | + | | All | `jq .[]` | | |
| 53 | + | | First | `jq '.[0]'` | | |
| 54 | + | | Range | `jq '.[2:4]'` | | |
| 55 | + | | First 3 | `jq '.[:3]'` | | |
| 56 | + | | Last 2 | `jq '.[-2:]'` | | |
| 57 | + | | Before Last | `jq '.[-2]'`| | |
| 58 | + | | Select array of int by value | `jq 'map(select(. >= 2))'` | | |
| 59 | + | | Select array of objects by value| ** jq '.[] | select(.id == "second")'** | | |
| 60 | + | | Select by type | ** jq '.[] | numbers' ** with type been arrays, objects, iterables, booleans, numbers, normals, finites, strings, nulls, values, scalars | | |
| 61 | + | ||
| 62 | + | ### Mapping and Transforming | |
| 63 | + | ||
| 64 | + | | Description | Command | | |
| 65 | + | | ------------| :-----: | | |
| 66 | + | | Add + 1 to all items | `jq 'map(.+1)'` | | |
| 67 | + | | Delete 2 items| `jq 'del(.[1, 2])'` | | |
| 68 | + | | Concatenate arrays | `jq 'add'` | | |
| 69 | + | | Flatten an array | `jq 'flatten'` | | |
| 70 | + | | Create a range of numbers | `jq '[range(2;4)]'` | | |
| 71 | + | | Display the type of each item| `jq 'map(type)'` | | |
| 72 | + | | Sort an array of basic type| `jq 'sort'` | | |
| 73 | + | | Sort an array of objects | `jq 'sort_by(.foo)'` | | |
| 74 | + | | Group by a key - opposite to flatten | `jq 'group_by(.foo)'` | | |
| 75 | + | | Minimun value of an array| `jq 'min'` .See also min, max, min_by(path_exp), max_by(path_exp) | | |
| 76 | + | | Remove duplicates| `jq 'unique'` or `jq 'unique_by(.foo)'` or `jq 'unique_by(length)'` | | |
| 77 | + | | Reverse an array | `jq 'reverse'` | | |
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