Developer data tools

Format, convert, and inspect developer data.

Free browser-based tools for JSON, YAML, Base64, URLs, timestamps, hashes, regex, cron expressions, XML, and request metadata.

Popular Tools

Start with the tools developers most often need when debugging copied payloads, browser data and API responses.

Tool JSON Pretty Print & Validator

Pretty print, minify and validate JSON with clear error feedback.

Tool Base64 Encoder/Decoder

Convert text to Base64 and decode Base64 payloads locally.

Tool Timestamp Converter

Convert Unix timestamps across seconds, milliseconds and readable dates.

Tool Hash Generator

Generate MD5, SHA-1 and SHA-256 hashes in the browser.

Tool Regex Tester

Test regular expressions and inspect matches with practical examples.

Tool Text Diff Checker

Compare logs, snippets and configuration files side by side.

Tool URL Encoder/Decoder

Encode query strings, path segments and URL components safely.

Tool Cron Expression Parser

Read cron schedules and catch common field mistakes.

Tool JSON Compare

Compare API responses and configuration changes.

Tool XML Formatter & Validator

Format and validate XML, SOAP and SVG snippets.

Tool YAML Formatter & Linter

Clean up YAML indentation and config whitespace.

Tool JSON to YAML Converter

Convert small config examples between JSON and YAML.

Tool Categories

Categories are organized around payload debugging instead of a broad directory of unrelated utilities.

Category JSON, XML and YAML

Format, validate, compare and convert API responses, configs and webhook payloads.

Category Encoding

Decode Base64, URL values and HTML entities in the browser.

Category Time

Convert timestamps, inspect time zones and understand cron expressions.

Category Crypto

Generate hashes and test browser-based encryption workflows carefully.

Category Network

Debug user agents, status codes, MIME types and browser request behavior.

Category Text

Compare text, test regular expressions and inspect hidden differences.

Developer References

Reference pages support the tools with tables, examples, common mistakes and debugging notes.

Reference HTTP Status Codes

Common status codes, debugging notes and API response examples.

Reference MIME Types

File extensions, content types and browser behavior notes.

Reference Cron Syntax

Field meanings, examples and common scheduling mistakes.

Reference JSON Error Messages

Common JSON parser errors, likely causes and practical fixes.

Reference URL Encoding

Reserved characters, query string rules and JavaScript function differences.

Reference Web Crypto API

Supported browser crypto algorithms, limitations and safety notes.

Debug Workflows

Start from the failure mode you are seeing, then move to the tool or reference that narrows it down.

Workflow Broken API response

Validate JSON, identify HTML returned as JSON, and inspect parser errors.

Workflow Encoded payload value

Decode Base64, URL components and HTML entities before changing code.

Workflow Timestamp mismatch

Check seconds, milliseconds, UTC and local display before blaming the API.

Workflow Payload or config changed

Compare JSON, logs and text snippets to find the exact difference.

Workflow Webhook or token issue

Check signatures, JWT claims, replay behavior and stale browser tokens.

Workflow YAML config failed

Check indentation, tabs, nested lists and schema validation boundaries.

Workflow JSON/YAML conversion changed data

Review strings, booleans, nulls, comments and large numbers after conversion.

Workflow Production API incident

Trace retries, idempotency, correlation ids and async job polling.

Browser-Based Tools

Developer Data Tools is a static HTML, CSS and JavaScript site. Tool actions run in your browser, and pasted tool input is not saved by this site.

No account is required to use the tools.
Pasted JSON, text, encoded values and timestamps are handled in the page you opened.
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