YaFT - Yet another Feature Toggle

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Provides a simple feature toggle API that supports strings as keys and stringified booleans ("true" or "false") as values. Features can be given an optional start and end date. Features are grouped by prepending UUIDs. This is done automatically on creating the first feature in a group. To add more features to the group, prepend the new feature's key with a UUIDv4 followed by a pipe symbol | (see examples) All endpoints apart from the GET endpoint require a secret. This is created when creating a new feature toggle without a UUIDv4 and returned from the POST request. The secret is only returned upon creating the first feature toggle in a group.

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Usage:

Prod usage (EARLY ALPHA)

Please note that this program is in an alpha state and has not been tested. Use at your own risk! Copy and adapt docker-compose.yml or build your own setup.

Local usage (for development)

docker compose -f docker-compose-local.yml up --force-recreate --build

API Interaction

Creating new Feature Toggles

curl -d '{"Key":"myKey","Value":"true"}' -X POST "http://127.0.0.1:8080/features"

Responses

successful response: {"activeAt":null,"disabledAt":null,"key":"896ea308-382f-46b0-bc59-d93a28013633|myKey","secret":"156152c0-07c6-4c87-b73a-b10db750bca3aa88c846-ce3f-48af-8fc0-e42a7b92f7321c8af6bc-b8a8-4bd8-88a5-53215bb82ae9","value":"true"}

error response: {"error":"Failed to create feature toggle"}

Creating new Feature Toggles with existing UUID

curl -d '{"Key":"896ea308-382f-46b0-bc59-d93a28013633|myOtherKey","Value":"true","Secret":"156152c0-07c6-4c87-b73a-b10db750bca3aa88c846-ce3f-48af-8fc0-e42a7b92f7321c8af6bc-b8a8-4bd8-88a5-53215bb82ae9"}' -X POST "http://127.0.0.1:8080/features"

Responses

successful response: {"activeAt":null,"disabledAt":null,"key":"896ea308-382f-46b0-bc59-d93a28013633|myOtherKey","value":"true"}

error response if secret is wrong: {"error":"Invalid secret"}

error response if secret is correct but key exists: {"error":"Failed to create feature toggle"}

Deleting a specific Feature Toggle

curl -X DELETE "http://127.0.0.1:8080/features/896ea308-382f-46b0-bc59-d93a28013633|myKey/156152c0-07c6-4c87-b73a-b10db750bca3aa88c846-ce3f-48af-8fc0-e42a7b92f7321c8af6bc-b8a8-4bd8-88a5-53215bb82ae9"

Responses

successful response: {"message":"Feature toggle deleted"}

error response if secret is wrong: {"error":"Invalid secret"}

error response if secret is correct but feature was not found: {"error":"Feature not found"}

Activate a Feature Toggle

curl -X PUT "http://127.0.0.1:8080/features/activate/896ea308-382f-46b0-bc59-d93a28013633|myKey/156152c0-07c6-4c87-b73a-b10db750bca3aa88c846-ce3f-48af-8fc0-e42a7b92f7321c8af6bc-b8a8-4bd8-88a5-53215bb82ae9"

Responses

successful response: {"activeAt":null,"disabledAt":null,"key":"896ea308-382f-46b0-bc59-d93a28013633|myKey","value":"true"}

error response if secret is wrong: {"error":"Invalid secret"}

error response if secret is correct but feature was not found: {"error":"Failed to activate feature toggle"}

Activate a Feature Toggle at a certain date

curl -X PUT "http://127.0.0.1:8080/features/activateAt/896ea308-382f-46b0-bc59-d93a28013633|myKey/2026-10-10/156152c0-07c6-4c87-b73a-b10db750bca3aa88c846-ce3f-48af-8fc0-e42a7b92f7321c8af6bc-b8a8-4bd8-88a5-53215bb82ae9"

Responses

successful response: {"activeAt":2026-10-10,"disabledAt":null,"key":"896ea308-382f-46b0-bc59-d93a28013633|myKey","value":"true"}

error response if secret is wrong: {"error":"Invalid secret"}

error response if secret is correct but feature was not found: {"error":"Failed to activate feature toggle at"}

Deactivate a Feature Toggle

curl -X PUT "http://127.0.0.1:8080/features/deactivate/896ea308-382f-46b0-bc59-d93a28013633|myKey/156152c0-07c6-4c87-b73a-b10db750bca3aa88c846-ce3f-48af-8fc0-e42a7b92f7321c8af6bc-b8a8-4bd8-88a5-53215bb82ae9"

Responses

successful response: {"activeAt":null,"disabledAt":null,"key":"88ce4805-92a5-4774-ac05-5ebf12de9a58|a","value":"false"}

error response if secret is wrong: {"error":"Invalid secret"}

error response if secret is correct but feature was not found: {"error":"Failed to deactivate feature toggle"}

Deactivate a Feature Toggle at a certain date

curl -X PUT "http://127.0.0.1:8080/features/deactivateAt/896ea308-382f-46b0-bc59-d93a28013633|myKey/2026-10-10/156152c0-07c6-4c87-b73a-b10db750bca3aa88c846-ce3f-48af-8fc0-e42a7b92f7321c8af6bc-b8a8-4bd8-88a5-53215bb82ae9"

Responses

successful response: {"activeAt":null,"disabledAt":2026-10-10,"key":"88ce4805-92a5-4774-ac05-5ebf12de9a58|a","value":"false"}

error response if secret is wrong: {"error":"Invalid secret"}

error response if secret is correct but feature was not found: {"error":"Failed to deactivate feature toggle"}

Getting a specific Feature Toggle

curl "http://127.0.0.1:8080/features/896ea308-382f-46b0-bc59-d93a28013633|myKey"

Responses

successful response: {"activeAt":null,"disabledAt":null,"key":"896ea308-382f-46b0-bc59-d93a28013633|myKey","value":"true"}

error response: {"error":"Feature not found"}

Getting all Feature Toggles for a given UUID

curl "http://127.0.0.1:8080/features/896ea308-382f-46b0-bc59-d93a28013633"

Responses

successful response: {"toggles":[{"ID":20,"Key":"896ea308-382f-46b0-bc59-d93a28013633|myKey","Value":"true","ActiveAt":null,"DisabledAt":null},{"ID":21,"Key":"896ea308-382f-46b0-bc59-d93a28013633|myOtherKey","Value":"true","ActiveAt":null,"DisabledAt":null}]}

Getting the collection hash for a given UUID

curl "http://127.0.0.1:8080/collectionHash/896ea308-382f-46b0-bc59-d93a28013633"

Responses

successful response: {"collectionHash":"dce01876b3f0c843fb2c1e5efe54bf807dc991eefc660d112306b49f6e2335c6"}

error response: {"error":"Feature not found"}

Updating a secret for a given UUID

curl -X PUT "http://127.0.0.1:8080/secret/update/896ea308-382f-46b0-bc59-d93a28013633/156152c0-07c6-4c87-b73a-b10db750bca3aa88c846-ce3f-48af-8fc0-e42a7b92f7321c8af6bc-b8a8-4bd8-88a5-53215bb82ae9/mynewsecret"

Responses

successful response: {"key":"896ea308-382f-46b0-bc59-d93a28013633"}

error response if secret is invalid or UUID does not exist: {"error":"Invalid secret"}

error response if new secret is not URL parseable: {"error": "New secret is not URL parseable, aborting operation"}

Licenses

• Code: MIT License
• Logo/Branding: All rights reserved