{"id":18770,"date":"2021-10-20T05:40:12","date_gmt":"2021-10-19T22:40:12","guid":{"rendered":"https:\/\/huongdanjava.com\/?p=18770"},"modified":"2024-11-17T15:38:07","modified_gmt":"2024-11-17T08:38:07","slug":"convert-json-to-csv-using-jackson-library","status":"publish","type":"post","link":"https:\/\/huongdanjava.com\/convert-json-to-csv-using-jackson-library.html","title":{"rendered":"Convert JSON to CSV using Jackson library"},"content":{"rendered":"

Jackson library makes it possible for us to convert data in JSON form to different data formats and vice versa. In this tutorial, I will show you how to convert data from JSON to CSV!<\/p>\n

First, I will create a new Maven project:<\/p>\n

\"\"<\/p>\n

with Jackson Dataformat CSV dependency as follows:<\/p>\n

<dependency>\r\n  <groupId>com.fasterxml.jackson.dataformat<\/groupId>\r\n  <artifactId>jackson-dataformat-csv<\/artifactId>\r\n  <version>2.18.1<\/version>\r\n<\/dependency><\/pre>\n
As an example, I will convert the following JSON string to a CSV file:<\/p>\n
{\r\n    \"name\" : \"Khanh\",\r\n    \"code\" : 99,\r\n    \"date\" : \"04-07-2017\",\r\n    \"gotMarried\": true\r\n}<\/pre>\n
To start, I will create a new Application class with the main() method as follows:<\/p>\n
package com.huongdanjava.jackson;\r\n\r\npublic class Application {\r\n\r\n  public static void main(String[] args) {\r\n    \r\n  }\r\n}\r\n<\/pre>\n
First, you can use the readTree() method of Jackson’s ObjectMapper object to read the JSON content that you need to convert.<\/strong><\/p>\n
There are many overload readTree() methods to help you do this:<\/p>\n
\"\"<\/p>\n
You can read JSON content from file, from string, from byte,… Depending on your need, please use overload methods of readTree() for reasonable. Here, I will save the above JSON content into the data.json file in the src\/main\/resources directory for an example:<\/p>\n
JsonNode jsonNode = new ObjectMapper().readTree(new File(\"src\/main\/resources\/data.json\"));<\/pre>\n
This JSON content will be saved to the JsonNode object as you can see!<\/p>\n
Next, we will use the CsvSchema Builder object to define the columns of the CSV file.<\/strong><\/p>\n
For my example, the code would look like this:<\/p>\n
CsvSchema.Builder builder = CsvSchema.builder();\r\njsonNode.elements().next().fieldNames().forEachRemaining(f -> builder.addColumn(f));<\/pre>\n
The above code is that we are getting all the keys in the JSON data, including name, code, date, gotMarried in our example, to define it as a column in the CSV file.<\/p>\n
You can also specify which data, corresponding to which key in the JSON data, is converted to a CSV file by defining the CsvSchema Builder as follows:<\/p>\n
CsvSchema.Builder builder = CsvSchema.builder()\r\n    .addColumn(\"name\")\r\n    .addColumn(\"code\")\r\n    .addColumn(\"date\");<\/pre>\n
With this code, my example only has the data of the column name, code and date converted. I will use this code in this tutorial as an example.<\/p>\n
After you have the CsvSchema Builder, you can get the CsvSchema object<\/strong> as follows:<\/p>\n
CsvSchema csvSchema = builder.build().withHeader();<\/pre>\n
Now we can use CsvMapper to convert JSON data to CSV data<\/strong>:<\/p>\n
CsvMapper csvMapper = new CsvMapper();\r\ncsvMapper.configure(Feature.IGNORE_UNKNOWN, true);\r\ncsvMapper.writerFor(JsonNode.class)\r\n    .with(csvSchema)\r\n    .writeValue(new File(\"src\/main\/resources\/data.cvs\"), jsonNode);<\/pre>\n
Because I am defining the columns manually, there will be columns that CsvMapper is not aware of when doing the conversion. Therefore, I need to configure it to ignore those columns.<\/p>\n
In this example, I save the output file data.csv in the directory src\/main\/resources.<\/p>\n
The entire code of the example is as follows:<\/p>\n
package com.huongdanjava.jackson;\r\n\r\nimport com.fasterxml.jackson.core.JsonGenerator.Feature;\r\nimport com.fasterxml.jackson.databind.JsonNode;\r\nimport com.fasterxml.jackson.databind.ObjectMapper;\r\nimport com.fasterxml.jackson.dataformat.csv.CsvMapper;\r\nimport com.fasterxml.jackson.dataformat.csv.CsvSchema;\r\nimport java.io.File;\r\nimport java.io.IOException;\r\n\r\npublic class Application {\r\n\r\n  public static void main(String[] args) throws IOException {\r\n    JsonNode jsonNode = new ObjectMapper().readTree(new File(\"src\/main\/resources\/data.json\"));\r\n\r\n    CsvSchema.Builder builder = CsvSchema.builder()\r\n        .addColumn(\"name\")\r\n        .addColumn(\"code\")\r\n        .addColumn(\"date\");\r\n\r\n    CsvSchema csvSchema = builder.build().withHeader();\r\n\r\n    CsvMapper csvMapper = new CsvMapper();\r\n    csvMapper.configure(Feature.IGNORE_UNKNOWN, true);\r\n    csvMapper.writerFor(JsonNode.class)\r\n        .with(csvSchema)\r\n        .writeValue(new File(\"src\/main\/resources\/data.csv\"), jsonNode);\r\n  }\r\n}\r\n<\/pre>\n
The output when running the program is as follows:<\/p>\n
\"\"<\/p>\n
Jackson will not work with nested JSON data types.<\/strong><\/p>\n
For example, if you have the following JSON string:<\/p>\n
{\r\n    \"name\" : \"Khanh\",\r\n    \"code\" : 99,\r\n    \"date\" : \"04-07-2017\",\r\n    \"gotMarried\": true,\r\n    \"group\" : [\r\n        \"ABC\", \"XYZ\"\r\n    ],\r\n    \"class\" : {\r\n        \"name\" : \"A\",\r\n        \"code\" : 123\r\n    }\r\n}<\/pre>\n
then when you code, you need to manually define the names of the columns to remove these nested JSON guys!<\/p>\n\n\n
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\n            3.2\/5 - (6 votes)    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"
Jackson library makes it possible for us to convert data in JSON form to different data formats and vice versa. In this tutorial, I will show you how to convert data from JSON to CSV! First, I will create a new Maven project: with Jackson… Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":1377,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1201],"tags":[],"class_list":["post-18770","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-jackson-en","clearfix"],"yoast_head":"\nConvert JSON to CSV using Jackson library - Huong Dan Java<\/title>\n<meta name=\"description\" content=\"In this tutorial, I will guide you all on how to convert JSON to CSV using Jackson library.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/huongdanjava.com\/convert-json-to-csv-using-jackson-library.html\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Convert JSON to CSV using Jackson library - Huong Dan Java\" \/>\n<meta property=\"og:description\" content=\"In this tutorial, I will guide you all on how to convert JSON to CSV using Jackson library.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/huongdanjava.com\/convert-json-to-csv-using-jackson-library.html\" \/>\n<meta property=\"og:site_name\" content=\"Huong Dan Java\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/nhkhanh2406\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/nhkhanh2406\" \/>\n<meta property=\"article:published_time\" content=\"2021-10-19T22:40:12+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-11-17T08:38:07+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/huongdanjava.com\/wp-content\/uploads\/2016\/09\/json.png\" \/>\n\t<meta property=\"og:image:width\" content=\"300\" \/>\n\t<meta property=\"og:image:height\" content=\"300\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Khanh Nguyen\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@https:\/\/twitter.com\/KhanhNguyenJ\" \/>\n<meta name=\"twitter:site\" content=\"@KhanhNguyenJ\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Khanh Nguyen\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/convert-json-to-csv-using-jackson-library.html#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/convert-json-to-csv-using-jackson-library.html\"},\"author\":{\"name\":\"Khanh Nguyen\",\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/#\\\/schema\\\/person\\\/dc859d7f8cbea3b593e6738de9cbb82d\"},\"headline\":\"Convert JSON to CSV using Jackson library\",\"datePublished\":\"2021-10-19T22:40:12+00:00\",\"dateModified\":\"2024-11-17T08:38:07+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/convert-json-to-csv-using-jackson-library.html\"},\"wordCount\":419,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/#\\\/schema\\\/person\\\/dc859d7f8cbea3b593e6738de9cbb82d\"},\"image\":{\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/convert-json-to-csv-using-jackson-library.html#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/huongdanjava.com\\\/wp-content\\\/uploads\\\/2016\\\/09\\\/json.png\",\"articleSection\":[\"Jackson\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/huongdanjava.com\\\/convert-json-to-csv-using-jackson-library.html#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/convert-json-to-csv-using-jackson-library.html\",\"url\":\"https:\\\/\\\/huongdanjava.com\\\/convert-json-to-csv-using-jackson-library.html\",\"name\":\"Convert JSON to CSV using Jackson library - 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