JSON / Dev
15 toolsOnline JSON and developer tools for the formatting, encoding, and inspection tasks that come up constantly while building and debugging software: formatting and validating JSON, stripping whitespace to minify it for transfer, encoding and decoding Base64 and percent-encoded URLs, escaping HTML entities, decoding and signing JWTs, generating MD5 and SHA hashes, and parsing a raw HTTP header block into a readable table. Everything runs client-side, which matters here specifically, since the data pasted into these tools — API tokens, session cookies, auth headers — is often sensitive, and nothing is sent to a server. Backend and frontend developers use this category most: checking a JWT's claims before debugging an auth flow, minifying a JSON payload before shipping it, or reading a captured request's headers line by line. Each tool is a single-purpose utility for a quick check, not a general-purpose IDE feature.
All JSON / Dev tools
JSON Formatter and Validator
Format, validate, and minify JSON with instant error detection.
Open →Base64 Encode/Decode
Encode text to Base64 or decode Base64 back to text, with full UTF-8 support.
Open →JWT Decoder
Decode a JWT's header and payload to inspect its claims — no signature verification.
Open →JWT Encoder
Build and sign a JWT from a header, payload, and secret key — HS256 or unsecured.
Open →URL Encode/Decode
Percent-encode or decode text and URLs, with separate component and full-URI modes.
Open →Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text, entirely in your browser.
Open →HTML Escape/Unescape
Escape text to safe HTML entities, or decode HTML entities back to plain text.
Open →JSON Minifier
Strip all non-significant whitespace from JSON to reduce its size for transfer or storage.
Open →HTTP Header Parser
Parse a raw HTTP request or response header block into a readable, annotated table.
Open →XML Formatter
Pretty-print, minify, and validate XML, with full support for namespaces, CDATA, and comments.
Open →JSON to YAML Converter
Convert between JSON and YAML in both directions, with configurable indentation, flow style, and key sorting.
Open →YAML Validator
Validate YAML syntax with precise line/column error reporting, multi-document support, and an optional pretty-print.
Open →SQL Formatter
Pretty-print and minify SQL queries with configurable keyword casing and indentation.
Open →Regex Tester
Test regular expressions against sample text with live match highlighting and capture group breakdown.
Open →JSON Diff
Compare two JSON documents and see exactly what was added, removed, or changed between them.
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URL Parser
Break a URL down into protocol, host, port, path, query parameters, and fragment.
Open →Color Converter
Convert colors between HEX, RGB, and HSL, with full alpha/transparency support.
Open →Unix Timestamp Converter
Convert Unix timestamps to human-readable dates (UTC, local, ISO 8601) and back, both ways.
Open →Slug Generator
Turn a title or any text into a clean, URL-safe slug — lowercase, hyphenated, no special characters.
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