JSON & Data
JSON Viewer & Formatter
Validate, format, minify and inspect JSON with a searchable tree.
Open tool Free tools · No registration
Your Everyday Developer & QA Toolkit
Powerful, free developer tools for formatting, debugging, validating and testing. No registration required.
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Local processing by defaultNothing is uploaded unless you choose to send it
Tool library
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Every available utility runs in your browser and is free to use.
35 tools
JSON & Data
JSON Diff
Compare JSON structures and review additions, removals and changed values.
Open toolJSON & Data
XML Formatter
Parse, validate, format and minify XML safely in your browser.
Open toolJSON & Data
SQL Formatter
Format or minify SQL text locally. SQL is never executed.
Open toolJSON & Data
YAML Converter
Validate YAML and convert between YAML and JSON.
Open toolJSON & Data
CSV Viewer
Inspect and search CSV files locally, then export normalized CSV.
Open toolJSON & Data
JSON Schema Generator
Infer a JSON Schema from sample data and refine it as needed.
Open toolJSON & Data
JSON Schema Validator
Validate a JSON sample against a JSON Schema subset.
Open toolAPI & Backend
API Response Viewer
Format and inspect a pasted JSON response locally; no request is sent.
Open toolWeb Development
HTML Live Viewer
Preview HTML in a restricted sandbox without running scripts or loading remote resources.
Open toolWeb Development
CSS Formatter
Format or compact CSS source without executing it.
Open toolWeb Development
URL Encoder / Decoder
Encode and decode URL components or inspect query parameters without visiting a URL.
Open toolAPI & Backend
JWT Decoder
Decode JWT header and claims locally. Signature is not verified.
Open toolAPI & Backend
Base64 Encoder / Decoder
Encode and decode UTF-8 text with standard or URL-safe Base64.
Open toolAPI & Backend
HTTP Status Reference
Search common HTTP status codes and their meanings.
Open toolAPI & Backend
cURL Converter
Convert a limited set of cURL commands into JavaScript fetch examples. Never sends the request.
Open toolQA & Testing
Regex Tester
Test regular expressions in a time-limited worker with match and capture details.
Open toolQA & Testing
Test Data Generator
Generate fictional contact data and country-specific synthetic IMSI, IMEI and MSISDN test records.
Open toolQA & Testing
Text Diff
Compare two text inputs line by line with optional whitespace and case normalization.
Open toolQA & Testing
Timestamp Converter
Convert Unix seconds, milliseconds, microseconds and nanoseconds; parse common date formats and convert dates across time zones.
Open toolQA & Testing
Test Case Template Generator
Create deterministic positive, negative and boundary test templates from requirements.
Open toolQA & Testing
Test Execution Calculator
Calculate execution, pass, failure and automation percentages.
Open toolAutomation
JUnit XML Viewer
Summarize JUnit test suites, failures, skips and durations locally.
Open toolAutomation
Cypress Report Viewer
Summarize Cypress/Mochawesome JSON reports and failure messages locally.
Open toolAutomation
Playwright Report Viewer
Summarize Playwright JSON reporter output locally.
Open toolAutomation
Allure Results Viewer
Inspect one or more Allure result JSON documents locally.
Open toolAutomation
Automation Result Comparator
Compare two automation JSON reports by structure and value.
Open toolAutomation
Cron Expression Helper
Validate common five-field cron expressions and explain each field.
Open toolAutomation
Playwright / Cypress Helper
Browse copy-ready locator, assertion and API-test examples.
Open toolAutomation
UUID Generator
Generate cryptographically random UUID v4 values in your browser.
Open toolAutomation
Hash Generator
Generate SHA-256 or SHA-512 digests for text locally.
Open toolAutomation
Log Viewer
Search and filter pasted logs by severity without uploading them.
Open toolQA & Testing
HTML Accessibility Checker
Check common accessibility issues in supplied HTML without visiting a website.
Open toolQA & Testing
Screenshot Comparison
Compare two local images and download a pixel-difference image.
Open toolQA & Testing
Bug Report Template
Create a structured, copyable bug report from local form fields.
Open toolPrivate by default
Inputs are processed locally. Tools do not send your content to TestNexus.
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