DataFrame.toJSON
Convert DataFrame to JSON format
DataFrame.toJSON(options)
Parameters
Type
Description
Default
options
object, optional
Configuration object:
filePath: Local file path to write the CSV file to. If not specified, the CSV will be returned as a string. Only needed in Nodejs versionfileName: The name of the file to download as. Only needed in browser environment.format: The format of the JSON. Can be one of row or column.{
format: "column"
}The toJSON function can be used to write out a DataFrame or Series to JSON format/file. The output is configurable and will depend on the environment. In the following examples, we show you how to write/download a JSON file from Node and Browser environments.
Convert DataFrame/Series to JSON and return value
Node.js
Browser
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const dfd = require("danfojs-node")
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​
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let data = {
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Abs: [20.2, 30, 47.3],
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Count: [34, 4, 5],
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"country code": ["NG", "FR", "GH"],
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};
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​
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let df = new dfd.DataFrame(data);
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​
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const jsonObj = df.toJSON(); //defaults to column format
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console.log(jsonObj);
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​
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//output
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[
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{ Abs: 20.2, Count: 34, 'country code': 'NG' },
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{ Abs: 30, Count: 4, 'country code': 'FR' },
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{ Abs: 47.3, Count: 5, 'country code': 'GH' }
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]
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​
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//row format
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const jsonObjRow = df.toJSON({
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format: "row"
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});
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​
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console.log(jsonObjRow);
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//output
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{
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Abs: [ 20.2, 30, 47.3 ],
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Count: [ 34, 4, 5 ],
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'country code': [ 'NG', 'FR', 'GH' ]
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}
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<!DOCTYPE html>
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<html lang="en">
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​
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<script src="https://cdn.jsdelivr.net/npm/[email protected]/lib/bundle.min.js"></script>
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<title>Document</title>
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</head>
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​
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<body>
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​
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<script>
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​
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let data = {
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Abs: [20.2, 30, 47.3],
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Count: [34, 4, 5],
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"country code": ["NG", "FR", "GH"],
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};
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let df = new dfd.DataFrame(data);
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const csv = df.to_csv({ download: false });
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console.log(csv);
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</script>
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</body>
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​
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</html>
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Convert DataFrame/Series to JSON and write to local file path
Writing a DataFrame/Series as JSON, to a local file path is only supported in the Nodejs environment
Node.js
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const dfd = require("danfojs-node")
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​
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let data = {
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Abs: [20.2, 30, 47.3],
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Count: [34, 4, 5],
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"country code": ["NG", "FR", "GH"],
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};
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​
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let df = new dfd.DataFrame(data);
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​
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df.toJSON({ filePath: "./testOutput.json" });
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Convert DataFrame/Series to JSON and download file in browser
You can automatically convert and download a DataFrame/Series as a JSON file in a browser environment, by specifying a
fileName and setting download to true.1
let data = {
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Abs: [20.2, 30, 47.3],
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Count: [34, 4, 5],
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"country code": ["NG", "FR", "GH"],
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};
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​
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let df = new dfd.DataFrame(data);
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​
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df.toJSON({ fileName: "test_out.json", download: true });
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Last modified 1mo ago