JSON Formatter
Format, validate and minify JSON, and see exactly which line has a mistake.
Free tools
Developer tools
Format JSON and XML, convert CSV and YAML, minify code, test regex and generate hashes, passwords and CSS. Private, in your browser.
JSON to CSV
Turn a JSON list of records into CSV for Excel or Google Sheets.
CSV to JSON
Convert CSV rows into a JSON list, with numbers and true/false detected.
YAML to JSON
Convert YAML config files into JSON and catch indentation mistakes.
JSON to YAML
Convert JSON into clean YAML for configs, Kubernetes and CI files.
XML Formatter
Pretty-print or minify XML and find unclosed or mismatched tags.
HTML Minifier and Beautifier
Shrink HTML by removing comments and extra spaces, or re-indent it for reading.
CSS Minifier and Beautifier
Minify CSS for faster pages, or beautify it with clean indentation.
JavaScript Minifier and Beautifier
Strip comments and spaces from JavaScript, or re-indent minified code to read it.
Base64 Encode and Decode
Encode text to Base64 or decode Base64 back to text, with URL-safe mode.
URL Encode and Decode
Percent-encode or decode text for links, query strings and form data.
Hash Generator
Get MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of text or a file.
UUID Generator
Generate random UUID v4 values in bulk, in several formats.
Strong Password Generator
Create strong random passwords with a strength meter. Nothing is stored or sent.
Regex Tester
Test regular expressions live with highlighted matches, groups and flags.
JWT Decoder
Read the header, payload and expiry of a JSON Web Token. Decode only, no verification.
Unix Timestamp Converter
Convert Unix timestamps to dates and dates to timestamps, with India time.
Cron Expression Explainer
Translate a cron schedule into plain English and see its next run times.
Colour Converter
Convert colours between HEX, RGB and HSL, and check contrast against white and black.
CSS Gradient Generator
Design linear, radial and conic gradients and copy the CSS.
CSS Box Shadow Generator
Design layered box shadows with sliders and copy the CSS.
CSS Border Radius Generator
Round the corners of a box with sliders and copy the border-radius CSS.
HTML Entity Encode and Decode
Convert special characters to HTML entities and entities back to text.
Where it helps
Data and APIs
Format JSON and XML, convert CSV and YAML, decode JWTs and timestamps.
Security helpers
Generate passwords, UUIDs and hashes, and check downloads.
Front-end
Minify code and design gradients, shadows and rounded corners.
Good to know
Private by design
Your text and files are processed on your device and never uploaded.
Mind live secrets
Even locally, avoid pasting production keys on shared computers.
Fast on any device
Light pages that work on phones and slow connections.
Clear errors
Formatters point to the line and column of a mistake.
Questions people ask
Which free developer tools does Marketiism offer?
Twenty-three: JSON and XML formatters; JSON, CSV and YAML converters; HTML, CSS and JavaScript minifiers; Base64, URL and HTML entity encoders; hash, UUID and password generators; a regex tester, JWT decoder, Unix timestamp converter and cron explainer; and a colour converter with gradient, box shadow and border radius generators.
- 23 Tools. All free.
- 0 Uploads. All in your browser.
- IST Built in. Time tools show India time.
- No sign-up No limit. Use them daily.
What developer tools are available?
Twenty-three: JSON and XML formatters; JSON to CSV, CSV to JSON, YAML to JSON and JSON to YAML converters; HTML, CSS and JavaScript minifiers; Base64, URL and HTML entity encoders; hash, UUID and password generators; a regex tester, JWT decoder, Unix timestamp converter and cron explainer; and four CSS and colour tools.
Are these tools free?
Yes. There's no sign-up, no watermark and no daily limit. Marketiism, which makes business software for Indian small businesses, keeps them free because they help with everyday development work, whether or not you ever use the software. Use them for personal, client and commercial projects.
Is my code or data uploaded?
No. Every tool runs in your browser, so the JSON, code, tokens and files you paste never reach our servers, and nothing is stored after you close the page. Many tools keep working if you disconnect from the internet after the page loads, which shows nothing is being sent.
Which tools help with APIs?
The JSON formatter for reading and validating responses, the JWT decoder for tokens, the Unix timestamp converter for dates, the Base64 and URL encoders for headers and query strings, and the JSON to CSV converter for opening API data in a spreadsheet. Together they cover most everyday API debugging.
Which tools help with front-end work?
The HTML, CSS and JavaScript minifiers shrink files or make minified code readable. The colour converter checks contrast, and the gradient, box shadow and border radius generators produce ready CSS with a live preview. The HTML entity encoder helps when showing code on a page.
Which tools help with security tasks?
The password generator makes strong random passwords, the UUID generator makes secure random IDs, and the hash generator checks downloads against published SHA-256 values. The JWT decoder reads tokens, but never verifies them, so always verify signatures on your server. None of them sends your passwords, tokens or files anywhere.
Do the time tools understand India time?
Yes. The Unix timestamp converter shows UTC, India Standard Time and your device's zone side by side, the cron explainer lists the next runs in IST or UTC, and the JWT decoder shows token dates in both. That avoids the five-and-a-half-hour mix-ups that catch many Indian teams.
How do the formatters report errors?
The JSON, YAML and XML tools name the first problem with its line and column, such as a trailing comma, a tab in YAML or an unclosed tag. The JSON formatter also has a Go to line button. That saves scanning a long file by eye for one missing character.
Can I open files instead of pasting?
Yes. Most text tools have a file button to load a .json, .csv, .yaml, .xml, .html, .css or .js file, and the hash generator accepts any file. Files are read by your browser, not uploaded, and you can download the result with a click. Nothing is uploaded at any point.
Are the tools safe for production secrets?
They run locally, so nothing is sent to us. Still, treat live keys, passwords and tokens carefully: avoid pasting them on shared or public computers, close the tab when you're done and rotate anything you think has leaked. Test values are always the safer choice.
Do the tools work on a phone?
Yes. Every tool works in a mobile browser, which is handy for checking a token, a timestamp or a JSON payload away from your desk. Editing long files is easier on a computer, but everything runs on your phone with no app and nothing uploaded.
Do I need to install anything?
No. The tools run in any modern browser on a computer, tablet or phone. There's no extension, package or download. Bookmark the ones you use often, or keep this page open as a quick toolbox next to your editor and terminal during the working day.
Who makes these tools?
Marketiism, an Indian company that builds software that runs a shared WhatsApp inbox, GST billing, a CRM, bookings and online shops for small businesses. Its API and webhooks use JSON, so several of these tools come in handy when you connect it to other systems.
How is Marketiism different from these tools?
The free tools each do one small job in your browser. Marketiism is a full platform for running a business, with WhatsApp, billing, a CRM, bookings and reports, plus an API and webhooks for developers. It has a free trial, and our team can also set it up as a paid service.
Can I suggest a new developer tool?
Yes, please do. Use the contact page to tell us which tool you'd find useful and how you'd use it. We add tools based on what developers and small business teams actually need, and we read every suggestion, including improvements to the existing tools. Tell us which language or format you work with.