Developer tools that never touch a server.
Small, sharp utilities that run entirely in this tab — free, ad-free and with no sign-up. A JSON formatter, viewer, validator and comparator, and a JWT decoder that checks signatures without ever seeing your key.
- Nothing uploaded
- Nothing logged
- No account, no limits
JSON tools
Read, check, compare and reshape JSON without leaving the page.
JSON Formatter
Pretty-print an unreadable response, or minify it.
- Pretty-print
- Minify to one line
- Sort keys
- Indent 2 / 4 / tab
JSON Viewer
Explore a payload too big to scroll through.
- Collapsible tree
- Search keys and values
- Copy any path
- Handles 100k+ nodes
JSON Validator
Find the exact line something is rejecting.
- Exact line and column
- JSON Schema 2020-12 / 2019-09 / 07
- Jump to each error
JSON Comparator
See what actually changed between two documents.
- Structural diff
- Ignores key order
- Matches array items by id
- Side-by-side
JWT tools
Read what a token is claiming, and check that it was really signed.
JWT Decoder
Read a token’s claims, and prove its signature.
- Header and payload
- Expiry in plain words
- Signature check
- Secret or public key
JWT Encoder
Build a token from claims, and really sign it.
- Header and payload
- HS / RS / PS / ES
- Expiry presets
- Signs with WebCrypto
Text tools
Measure a piece of writing, and dress it down to something tidy.
Text Counter
Words, characters, sentences and paragraphs at once.
- Words and characters
- Sentences and paragraphs
- Reading time
- Keyword frequency
Text Formatter
Strip the mess out of text somebody else wrote.
- Remove extra spaces
- Delete duplicate lines
- Change case
- Tidy punctuation
Unplug the network. It still works.
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