Using Java, how to add some node to an existing json at the start of array?

Question

The below code inserts the "myvalue" field to the existing JSON but after the "id" key-value pair, I want to insert a value in this JSON but before the "id" field.

String originalJson="{"checkouts":[{"line_items":[{"id":"343f1f49d0ba7752b5ba84e0184384f4"}]}]}";
String modifiedJson= JsonPath.parse(originalJson)
                        .add("$.checkouts[0].line_items","myValue")
                        .jsonString();

The current output of the above code is :

{"checkouts":[{"line_items":[{"id":"343f1f49d0ba7752b5ba84e0184384f4"},"myValue"]}]}

But I want an output like this :

{"checkouts":[{"line_items":["myValue",{"id":"343f1f49d0ba7752b5ba84e0184384f4"}]}]}

Please edit your question to show exactly the JSON you want to produce. — tgdavies
– tgdavies, Commented Jul 21, 2021 at 12:25

tgdavies · Accepted Answer · 2021-07-21 12:38:09Z

1

You can do this:

        String originalJson="{\"checkouts\":[{\"line_items\":[{\"id\":\"343f1f49d0ba7752b5ba84e0184384f4\"}]}]}";
        DocumentContext json = JsonPath.parse(originalJson);
        JSONArray array = json.read("$.checkouts[0].line_items");
        array.add(0, "myValue");
        String modifiedJson= json
                .set("$.checkouts[0].line_items",array)
                .jsonString();

answered Jul 21, 2021 at 12:38

tgdavies

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