All developer tools

Search browser-based utilities for formatting, decoding, validation, conversion, API debugging, logs, IDs, timestamps, and file workflows.

Production debugging tools

Start with the strongest network, log, API contract, token, and SQL analyzers before browsing the full directory.

Dev Debug Helpers

Open

HAR File Analyzer

Analyze browser HAR files for slow requests, failed calls, duplicates, domains, and captured request timing.

Dev Debug Helpers

Open

Java Stacktrace Analyzer

Find root causes in Java and Spring stacktraces, highlight application frames, and collapse framework noise.

Dev Debug Helpers

Open

API Log Analyzer

Analyze API logs for ERROR/WARN/INFO counts, duplicate exceptions, correlation IDs, and timeline buckets.

API & Auth

Open

OpenAPI / Swagger Diff Checker

Compare OpenAPI or Swagger JSON/YAML files for added, removed, and potentially breaking API changes.

API & Auth

Open

JWT Security Inspector

Decode JWTs, inspect expiry, issuer, audience, algorithm choices, and common token security mistakes.

Formatters

Open

SQL Query Analyzer

Format SQL and flag dangerous mutations, missing WHERE clauses, SELECT *, and JOIN complexity hints.

JSON Tools Formatter Tools Encoder and Decoder Tools JWT Tools Regex Tools SQL Tools Timestamp and Date Tools API Debugging Tools Log Tools Generator Tools

Formatters

Open

JSON Formatter

Pretty-print raw JSON, minify payloads, and inspect syntax errors with clear feedback.

Formatters

Open

JSON Validator

Check JSON syntax quickly and surface readable parse errors before you ship or debug.

Formatters

Open

SQL Formatter

Beautify SQL queries for easier reading, code review, and debugging across environments.

Encoders & Decoders

Open

Base64 Encode / Decode

Encode plain text to Base64 or decode Base64 back to readable text with Unicode support.

Encoders & Decoders

Open

URL Encode / Decode

Convert strings between readable text and URL-safe encoded values with instant feedback.

API & Auth

Open

JWT Decoder

Decode JWT headers and payloads, inspect claims, and check expiry fields at a glance.

API & Auth

Open

JWT Expiry Checker

Show whether a JWT is expired, valid, or missing expiry claims with readable timestamps.

API & Auth

Open

Header Parser

Parse raw HTTP headers into readable key and value pairs for request and response debugging.

API & Auth

Open

Query Param Parser

Parse URLs and raw query strings into decoded key and value pairs and rebuild them cleanly.

API & Auth

Open

API Test Case Builder

Create QA-ready API test checklists and Gherkin drafts from endpoint details, sample responses, or error bodies.

Converters

Open

YAML to JSON

Convert YAML into readable JSON for APIs, config migrations, and test fixtures.

Converters

Open

JSON to YAML

Convert JSON into YAML for config files, docs, and human-readable environment data.

Converters

Open

cURL to fetch

Convert common cURL commands into readable JavaScript fetch examples for frontend work.

Converters

Open

cURL to Java

Turn common cURL commands into readable Java HttpClient examples with headers and body preserved.

Converters

Open

JSON to Java Class

Generate POJO-style Java classes from JSON with nested object and array type inference.

Converters

Open

Timestamp Converter

Convert Unix seconds, Unix milliseconds, and ISO date strings with readable UTC and local output.

Validators & Testers

Open

Regex Tester

Test regex patterns against sample text, inspect matches, and catch syntax errors immediately.

Validators & Testers

Open

JSONPath Tester

Run JSONPath expressions against sample JSON and inspect matches in a structured result panel.

Dev Debug Helpers

Open

Log Prettifier

Format JSON logs and semi-structured log lines into cleaner readable output for debugging.

Dev Debug Helpers

Open

Trace / Correlation ID Extractor

Scan pasted text or logs and extract likely trace, request, and correlation identifiers.

Dev Debug Helpers

Open

Mongo Query Formatter

Beautify Mongo-style query snippets so operators, selectors, and pipelines are easier to read.

Dev Debug Helpers

Open

HTTP Header Analyzer

Parse raw headers and highlight content types, auth hints, caching directives, and likely debug concerns.

Dev Debug Helpers

Open

HAR File Analyzer

Analyze browser HAR files for slow requests, failed calls, duplicates, domains, and captured request timing.

Dev Debug Helpers

Open

Java Stacktrace Analyzer

Find root causes in Java and Spring stacktraces, highlight application frames, and collapse framework noise.

Dev Debug Helpers

Open

API Log Analyzer

Analyze API logs for ERROR/WARN/INFO counts, duplicate exceptions, correlation IDs, and timeline buckets.

Validators & Testers

Open

JSON Schema Validator & Generator

Generate JSON Schema from sample JSON and validate payloads against required fields and basic types.

API & Auth

Open

OpenAPI / Swagger Diff Checker

Compare OpenAPI or Swagger JSON/YAML files for added, removed, and potentially breaking API changes.

API & Auth

Open

JWT Security Inspector

Decode JWTs, inspect expiry, issuer, audience, algorithm choices, and common token security mistakes.

Dev Debug Helpers

Open

Cron Expression Builder & Visualizer

Parse cron expressions, explain schedules, preview next runs, and start from common developer examples.

Formatters

Open

SQL Query Analyzer

Format SQL and flag dangerous mutations, missing WHERE clauses, SELECT *, and JOIN complexity hints.

API & Auth

Open

HTTP Request Builder

Build HTTP requests safely and generate cURL and fetch snippets without turning the site into an open proxy.

Encoders & Decoders

Open

Encoding Inspector

Detect Base64, hashes, UUIDs, JWT-looking strings, URL encoding, and show safe decoding attempts.

Additional file and utility tools

File conversions and general utilities remain available separately from the core debugging directory.