Free JSON Formatter, Validator & Converter 🛠️

Free JSON Formatter, Validator & Converter — All JSON Tools in One Place

Our free JSON formatter and validator online gives developers everything they need to work with JSON data in one place — beautify, minify, validate, sort keys, convert TXT to JSON, and export JSON to CSV — all running entirely in your browser with no data sent to a server. Whether you are debugging a minified API response, validating a configuration file, or converting a text file to JSON, this tool handles it instantly.

JSON Beautifier — Format Minified API Responses Instantly

APIs commonly return JSON in a compact, minified format with all whitespace removed to reduce payload size. While this is efficient for network transfer, it makes the response nearly impossible to read or debug by hand. Our JSON beautifier online parses the minified response and reformats it with proper indentation (2, 3, or 4 spaces — your choice), line breaks, and nested structure — turning a single-line blob into a readable, debuggable format in one click. This is functionally equivalent to what tools like JSONLint, JSON Editor Online, and browser developer tools do when you preview JSON responses.

TXT to JSON Converter Online — Convert Text File to JSON

This tool works as a TXT to JSON converter online — paste the contents of any text file or upload a .txt file directly, and the tool will parse and format it as valid JSON. This covers the txt format to json and text file to json conversion use cases commonly needed when working with API responses saved as plain text, log exports containing JSON payloads, configuration data stored in text format, or database exports that need to be validated as JSON before processing.

JSON Validator with Error Line Detection

The JSON validator checks your input against the JSON specification (RFC 8259 / ECMA-404) and reports any syntax errors — missing commas, unclosed brackets, invalid quote characters, trailing commas, and unescaped special characters — along with an error description and the position in the text where the error was found. This makes it much faster to locate and fix a syntax error in a large JSON object than manually scanning through the raw text.

JSON to CSV Converter — Export JSON Arrays as Spreadsheet Data

The JSON to CSV converter transforms a JSON array of objects into comma-separated values format, extracting all unique keys as column headers and mapping each object's values to the corresponding columns. This is useful for exporting API data to spreadsheets, preparing data for import into Excel or Google Sheets, and converting JSON database exports into a format that non-technical stakeholders can work with.

Sort JSON Keys Alphabetically

The Sort Keys feature recursively alphabetizes all object keys throughout a JSON structure, including nested objects. This is useful for normalizing JSON output for version control diffs (where unsorted keys produce false-positive changes), comparing JSON objects from different sources, and maintaining consistent key ordering in configuration files across team members.

A Quick Note on Privacy & Trust

All JSON processing — formatting, validation, conversion, sorting — runs entirely in your browser using JavaScript. No JSON data you paste or upload is ever sent to or stored on any server. This makes the tool safe for internal API responses, configuration secrets, database exports, and any sensitive JSON data. The tool is reviewed and tested regularly — most recently in June 2026.