Free Online Developer Tools for JSON, JWT, SQL & more
Format JSON, decode JWTs, test regex and more — paste anything and we'll open the right tool.
- Runs in your browser — nothing uploaded
- No signup
- 100% free
Popular tools
The tools developers reach for every day.
- JSON FormatterRepair, validate, and beautify broken JSON (missing quotes, trailing commas).
- JSON CompareFind the difference between two JSON objects visually and quickly.
- JWT DecoderDecode and inspect JSON Web Tokens (JWT) Header and Payload.
- Epoch Time ConverterConvert UNIX timestamps to human-readable dates and back instantly.
- Base64 Encoder & DecoderEncode text to Base64 and decode Base64 to text for API debugging.
- UUID GeneratorGenerate unique V4 UUIDs for database keys or testing.
- Crop Image OnlineCrop images exactly as selected with fixed aspect ratios. No upload, no resize, no quality loss.
- Image CompressorCompress JPG, PNG & WebP images directly in your browser. No upload, no tracking, instant download.
Browse by category
Find the right tool by what you're working on.
- 10 toolsJSON ToolsFormat, validate, compare, query and convert JSON.
- 6 toolsEncoding & SecurityTokens, hashes and encodings you meet when debugging APIs.
- 5 toolsCode Formatters & MinifiersFormat SQL and HTML, write Markdown, and minify CSS and JavaScript.
- 5 toolsText ToolsCount words, change case, style text and compare versions.
- 4 toolsDesign & ColorColors, palettes, gradients and CSS units for front-end work.
- 6 toolsGenerators & TestersPatterns, schedules, IDs, random numbers, timestamps and time zones.
- 5 toolsImage ToolsResize, convert, crop and compress images without uploading them.
- Looking for something specific?Browse every tool in one list, or press ⌘K or Ctrl K on any page to search.All tools
How it works
- 1
Paste your data
Drop a JWT, some JSON, a timestamp, a cron expression or any text into the box at the top.
- 2
See what it is
TrueFormatter recognises the format and shows a quick preview — the decoded token, the repaired JSON, the date.
- 3
Open the right tool
One click opens the matching tool with your input already filled in. Nothing is uploaded on the way.
Why developers use TrueFormatter
Tools you can trust with real API responses and tokens.
Runs in your browser
Every tool works with JavaScript on your own device. Nothing to install — open a page and start.
Nothing is uploaded
There's no server receiving your JSON, tokens, SQL or images. Analytics counts which tools are used, never what you put in them.
Free, no signup
No account, no email, no trial and no usage limits. Every tool is free to use as often as you like.
Fast and focused
Each page does one job well: paste, get the result, copy it, move on. Search any tool with ⌘K or Ctrl K.
Free online developer tools
TrueFormatter is a collection of free developer tools that run in your browser. They're grouped into json tools, encoding & security, code formatters & minifiers, text tools, design & color, generators & testers and image tools, so you can browse by task. If you know what you need, press ⌘K or Ctrl K on any page to search.
Formatting JSON?
The JSON Formatter beautifies or minifies JSON and repairs broken JSON in one click — unquoted keys, single quotes, comments and trailing commas. The JSON Validator shows the exact line and column of any syntax error.
Questions
Yes. Every tool is free to use with no account, no trial and no usage limit.
No. Every tool runs in your browser with JavaScript, so the JSON, tokens, SQL, text and images you use never leave your device. We use analytics to count which tools are used, but never what you paste into them.
It recognises what you paste — a JWT, JSON, a Unix timestamp, a cron expression, SQL, Base64, a hash and more — shows a quick preview, and opens the matching tool with your input already filled in.
It's at trueformatter.com/json-formatter. It formats, minifies and validates JSON and can automatically fix common errors like unquoted keys, single quotes and trailing commas.
No. The tools work in any modern browser on desktop or mobile — Chrome, Firefox, Safari or Edge.
Paste the response into the JSON Formatter to make it readable, use the JSON Validator to find syntax errors, and decode any Authorization token with the JWT Decoder.
Got something to format?
Paste it and TrueFormatter will open the right tool — free, no signup, nothing uploaded.