Function $toJSON

src/danfojs-base/io/browser/io.json.ts:115–168

(df: NDframe | DataFrame | Series, options?: JsonOutputOptionsBrowser)

 * ```
 */
const $toJSON = (df: NDframe | DataFrame | Series, options?: JsonOutputOptionsBrowser): object | void => {
    let { fileName, format, download } = { fileName: "output.json", download: false, format: "column", ...options }

    if (df.$isSeries) {
        const obj: { [key: string]: ArrayType1D } = {};
        obj[df.columns[0]] = df.values as ArrayType1D;

        if (download) {
            if (!fileName.endsWith(".json")) {
                fileName = fileName + ".json"
            }
            $downloadFileInBrowser(obj, fileName)
        } else {
            return obj
        }

    } else {
        if (format === "row") {
            const obj: { [key: string]: ArrayType1D } = {};
            for (let i = 0; i < df.columns.length; i++) {
                obj[df.columns[i]] = (df as DataFrame).column(df.columns[i]).values as ArrayType1D;
            }
            if (download) {
                if (!(fileName.endsWith(".json"))) {
                    fileName = fileName + ".json"
                }

                $downloadFileInBrowser(obj, fileName)
            } else {
                return obj
            }
        } else {
            const values = df.values as ArrayType2D
            const header = df.columns
            const jsonArr: any = [];

            values.forEach((val) => {
                const obj: any = {};
                header.forEach((h, i) => {
                    obj[h] = val[i]
                });
                jsonArr.push(obj);
            });
            if (download) {
                if (!fileName.endsWith(".json")) {
                    fileName = fileName + ".json"
                }
                $downloadFileInBrowser(jsonArr, fileName)
            } else {
                return jsonArr
            }
        }
    }
};

/**
 * Internal function to download a JSON file in the browser.