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Developer Tools

Private formatters, validators, converters and generators that run locally in your browser.

Browse Developer Tools

JSON FormatterFormat and optionally sort JSON keys locally.JSON ValidatorCheck JSON syntax and report its root type and structure.JSON MinifierRemove unnecessary JSON whitespace without changing data.JSON Tree ViewerExplore JSON as an expandable local tree.JSON to YAMLConvert JSON objects and arrays to readable YAML locally.YAML to JSONConvert safe, data-only YAML into formatted JSON.YAML Formatter and ValidatorValidate and normalize common data-only YAML documents.XML Formatter and ValidatorCheck well-formed XML and format its element structure locally.SQL FormatterFormat SQL joins, subqueries, CASE expressions and comments without executing them.Base64 Encoder and DecoderEncode UTF-8 text to Base64 or decode Base64 locally.JWT DecoderDecode JWT header and payload without verifying or uploading the token.UUID GeneratorGenerate cryptographically random UUID v4 values in the browser.Unix Timestamp ConverterConvert Unix seconds or milliseconds to ISO date and local time.Regex TesterTest a JavaScript regular expression against local text with bounded input.HEX, RGB and CMYK Colour ConverterTranslate HEX and RGB colour codes with a live swatch and a mathematical CMYK estimate.Image Palette ExtractorUpload a local PNG, JPEG or WebP image and extract its five dominant colours in the browser.Text DiffCompare old and new text line by line entirely in the browser.SQL CREATE TABLE and Dummy Data GeneratorDesign a table with up to 15 columns and generate SQL Server or Oracle CREATE TABLE scripts with up to 1,000 rows of customizable dummy data.

Start here: practical tutorial

Inspect developer data without sending it to a service

Identify the format, load a small bounded sample, run the matching local operation, read errors and compare output before using it in code or configuration.

  1. Choose the tool matching the input you have and the result you need.
  2. Confirm every unit, option and assumption before running it.
  3. Review the example, limitations and output before using the result.

Worked example

Formatting JSON reveals nesting and syntax errors, but valid JSON can still violate an application's schema.

What this does not replace

The tools do not execute SQL, verify JWT signatures, connect to APIs or make untrusted input safe.

Format JSON locally