# JSON Formatter > Validate, pretty-print, minify, sort or repair JSON, with the exact line and column of any error. - Page: https://acepdfmd.com/tool/json-formatter/ - Updated: 2026-09-18 - Runs at: https://acepdfmd.com (Uploaded files are deleted within 60 minutes. No signup for light use.) - Also in 29 languages: https://acepdfmd.com//tool/json-formatter/ ## Format, validate, minify and repair JSON online JSON that comes out of a log, a web service response or a config file is often one long line, or almost valid but not quite. The JSON Formatter does the four jobs that come up every day: it validates the text and tells you the exact line and column of any mistake, pretty-prints it with 2 spaces, 4 spaces or tabs, minifies it for transmission, and optionally sorts the keys so two files can be compared by eye. Paste the JSON or drop a .json file. When repair is on, the most common paste mistakes are fixed before validation: comments, trailing commas, single-quoted strings, unquoted keys, capitalised True, False and None, NaN and Infinity, a stray byte-order mark and Markdown code fences around the text. The result tells you when a repair was applied, so you know the input was not strict JSON. Nothing else is changed: numbers keep their precision, key order is preserved unless you ask for sorting, and Unicode is written as it is rather than escaped. The formatted file is downloaded with a name that says what happened to it. The same validator runs inside every JSON tool on this site, so a file that passes here converts everywhere. For a structural comparison of two files use Compare JSON, and to move the data into a spreadsheet use JSON to Excel or JSON to CSV. ## How to use the JSON Formatter tool 1. Type or paste your JSON, or open a file. 2. Set your options: Output, Sort keys alphabetically, Repair common mistakes (comments, trailing commas, single quotes). 3. Click “Process JSON Formatter” and download your result. ## Common questions ### Is JSON Formatter free? Yes. JSON Formatter is free for light use with no signup needed. Anonymous visitors get 10 free tasks per day, and creating a free account makes daily use unlimited. A paid Pro plan removes ads and raises file-size limits for heavier work. ### Is my file safe? Yes. Your file is sent over HTTPS, processed by self-hosted open-source software on our servers (no third-party AI or cloud APIs), and deleted within 60 minutes at the latest, usually right after your result is ready. ### What file formats does JSON Formatter accept? JSON Formatter accepts JSON, TXT files. Convert other formats to a supported one first; the related tools below can usually do it. ## Related tools - [Compare JSON](https://acepdfmd.com/tool/json-compare/): Compare two JSON files structurally and list every added, removed and changed value by path. - [JSON to YAML](https://acepdfmd.com/tool/json-to-yaml/): Convert JSON to readable YAML with keys in their original order. - [JSON to CSV](https://acepdfmd.com/tool/json-to-csv/): Flatten JSON records into a CSV file that opens in any spreadsheet. - [JSON to PDF](https://acepdfmd.com/tool/json-to-pdf/): Turn JSON into a readable PDF: records become tables, nested data an outline. - [Markdown to JSON](https://acepdfmd.com/tool/markdown-to-json/): Export the document's structure as a JSON syntax tree (pandoc AST). - [YAML to JSON](https://acepdfmd.com/tool/yaml-to-json/): Convert YAML to clean JSON, including multi-document files. Read the guide: [JSON Tools Guide: Convert Documents and Data to JSON and Back](https://acepdfmd.com/guides/json-guide/)