Developer converters that run entirely in your browser
FormatPort is a toolbox of JSON, YAML, TOML, CSV, TSV, XML, JWT, Base64, cURL, regex, hash and text converters — pick any input and output format and it converts between them. Everything is parsed and generated locally by JavaScript in this tab. There is no server component, no account, and no analytics.
The JSON to YAML converter opens here. Every tool listed below also has its own page and works the same way.
Private by design. Your input never leaves this browser. Conversions run locally on your device.
Popular converters
- Convert any format — JSON, YAML, TOML, CSV, TSV, XML and HTML tables, any pair
- JSON to YAML — readable config from an API response
- CSV to JSON — spreadsheet exports into records
- JSON to TypeScript — interfaces from a sample payload
- JWT Decoder — inspect claims without uploading the token
- cURL to code — fetch, axios or Python requests
- Regex Tester — with a worker timeout so the tab never freezes
Browse by category
- Data format converters — JSON, YAML, TOML, CSV, TSV, XML and HTML tables, any pair
- Code generators — TypeScript, Zod, Python, Go, SQL and JSON Schema from a JSON sample
- Encoding, hashing and tokens — Base64, URL encoding, SHA-256, MD5, JWT and cURL
- Timestamps and identifiers — Unix time, ISO 8601, UUID and ULID
- Text tools — case conversion, regex testing and diffing