How To Convert Base64 to JSON String in JavaScript? Last Updated : 13 Sep, 2024 Summarize Comments Improve Suggest changes Share Like Article Like Report There could be situations in web applications, where there is a need to decode the data from Base64 format back into its original JSON format. It generally happens when one has to transmit data over the network where Base64 encoding is well suited for encoding binary data.In this article, we will see how one can convert Base64 strings into JSON-formatted strings in JavaScript.Different approaches to convert Base64 to JSON String in JavaScript.Table of ContentUsing atob() and JSON.parse()Using Buffer in Node.jsApproach 1: Using atob() and JSON.parse()There are occasions, especially within web browsers when Base64 data and JSON have to be decoded and parsed separately.In the first step, we will use atob() function which converts Base64 string into a plain text string.In the last step, we will use JSON.parse() for conversion of the decoded string into a a JSON object. HTML <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Convert Base64 to JSON String</title> </head> <body> <h1>GeeksForGeeks</h1> <h3>Base64 to JSON Conversion</h3> <button id="convert-btn">Convert Base64 to JSON</button> <pre id="result"></pre> <script> // Sample Base64-encoded JSON string const base64Data = "eyAiTmFtZSI6ICJQYW5rYWogQmluZCIsICJBZ2UiOiAyMSwgIkNvdW50cnkiOiAiSW5kaWEiIH0="; // Function to convert Base64 to JSON function convertBase64ToJson() { try { // Decode Base64 to string const jsonString = atob(base64Data); // Parse string to JSON const jsonObject = JSON.parse(jsonString); // Display the JSON object document.getElementById("result").textContent = JSON.stringify(jsonObject, null, 2); } catch (error) { console.error("Error decoding Base64:", error); } } // Event listener for the convert button document.getElementById("convert-btn").addEventListener("click", convertBase64ToJson); </script> </body> </html> Outputatob() and JSON.parse()Approach 2: Using Buffer in Node.jsThis approach is adequate for JavaScript running on a server (Node.js) and where one has to deal with Binary and Base64 encoding.In first step you have to create a Buffer from Base64 string using Buffer.from(base64Data, ‘base64’). Use buffer.toString(‘utf-8’) and change the Buffer to a UTF-8 string.In last step we will use JSON.parse() for converting string into JSON object. JavaScript // Node.js Example // Sample Base64-encoded JSON string const base64Data = "eyAiTmFtZSI6ICJQYW5rYWogQmluZCIsICJBZ2UiOiAyMSwgIkNvdW50cnkiOiAiSW5kaWEiIH0="; // Convert Base64 to buffer const buffer = Buffer.from(base64Data, 'base64'); // Convert buffer to string and parse to JSON const jsonString = buffer.toString('utf-8'); const jsonObject = JSON.parse(jsonString); console.log(jsonObject); Output{ Name: 'Pankaj Bind', Age: 21, Country: 'India' } Comment More infoAdvertise with us P pankajbind Follow Improve Article Tags : JavaScript Web Technologies Similar Reads Non-linear Components In electrical circuits, Non-linear Components are electronic devices that need an external power source to operate actively. Non-Linear Components are those that are changed with respect to the voltage and current. 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