Developer Tools
Inspect JSON, convert structured data, encode URL components and examine tokens. Syntax checks and encoding run in your browser; decoding a token does not verify it.
Inspect and transform JSON
JSON Validator
Validate JSON and locate parse errors without uploading your data.
Check a configuration snippet after editing commas, quotes or brackets.
JSON Formatter
Format and validate JSON locally in your browser.
Make a compact API response readable before investigating a missing field.
JSON Minifier
Minify valid JSON locally for smaller payloads.
Prepare a compact JSON payload after checking its syntax and values.
JSON to YAML
Convert valid JSON to readable YAML in your browser.
Move a JSON configuration into a YAML-based workflow and review the result.
YAML to JSON
Convert YAML to formatted JSON locally.
Inspect a YAML configuration as JSON before passing it to an API.
JSON to CSV
Convert an array of JSON objects to CSV locally.
Turn an API's list of records into a table for spreadsheet review.
CSV to JSON
Convert header-based CSV to a JSON array locally.
Build a JSON fixture from a CSV export while keeping postal codes and leading zeros.
Encode and decode values
Base64 Encode
Encode Unicode text as Base64 locally.
Prepare text for a protocol field that expects a Base64 representation.
Base64 Decode
Decode valid Base64 text locally in your browser.
Inspect an encoded value from your own application without sending it to a decoding service.
URL Encode
Encode a URL component, such as a query parameter value.
Put text containing spaces or an ampersand into a query parameter without splitting it.
URL Decode
Decode URL-encoded text locally.
Read a redirect parameter from an application log without navigating to its destination.
Inspect tokens and create identifiers
JWT Decoder
Inspect JWT header and payload locally without verifying its signature.
Debug an expiry claim in a test token you control; never treat the displayed claims as trusted.
UUID Generator
Generate UUID v4 values locally using Web Crypto.
Create identifiers for test fixtures without manually inventing repeated IDs.
Related guides
How to Validate JSON and Fix Common Syntax Errors
Find common JSON syntax errors, repair quotes and trailing commas, then format nested data without changing its meaning.
JWT Decode vs Verify: What the Claims Can Tell You
Learn what a JWT decoder reveals, why readable claims are untrusted, and how to inspect expiry without confusing decoding with signature verification.
How to Format JSON and Make It Readable
Make compact JSON readable with indentation, inspect nested objects and avoid changes to large identifiers or duplicate keys when formatting.